Table 3(A) : Population fluctuation (size distribution) of...
Transcript of Table 3(A) : Population fluctuation (size distribution) of...
Table 3(A) : Population fluctuation (size distribution) of snails at Asan Barrage (L-1) locality of Doon Valley during March 2002 to February 2003
Lymnaea (P.) acuminata f. chlamys (Benson, 1836) Lymnaea (P.) acuminata f. patula (Troschel, 1837) Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 10 13 3 β β 26 3 12 1 β β 16
Apr. 12 15 2 β β 29 6 15 2 β β 23
May 10 18 3 β β 31 8 14 3 β β 25
Jun. 12 20 4 β β 36 7 11 4 β β 22
Jul. 10 12 1 β β 23 4 8 1 β β 13
Aug. 8 5 β β β 13 4 3 β β β 7
Sep. 5 7 β β β 12 3 6 β β β 9
Oct. 8 14 β β β 22 6 10 β β β 16
Nov. 7 10 2 β β 19 5 7 1 β β 13
Dec. 4 11 1 β β 16 4 6 2 β β 12
Jan. 6 10 β β β 16 3 8 β β β 11
Feb. 8 12 2 β β 22 5 9 β β β 14
Total 100 147 18 β β 265 58 109 14 β β 181
%age 37.74 55.46 6.80 β β 32.05 60.22 7.73
Contd . . .
Table 3 (A) contd . . .
Thiara (M.) tuberculata (Mueller, 1774) Indoplanorbis exustus (Deshayes, 1834) Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 3 9 10 5 1 28 4 4 β β β 8
Apr. 2 10 15 3 2 32 2 5 2 β β 9
May 4 7 10 4 3 28 4 4 2 β β 10
Jun. 3 9 8 8 2 30 3 7 1 β β 11
Jul. β 8 8 5 3 24 β 7 β β β 7
Aug. β 7 5 2 β 14 β 5 β β β 5
Sep. 4 8 5 3 β 20 2 3 2 β β 7
Oct. 6 12 14 6 β 38 3 4 β β β 7
Nov. 4 5 12 2 β 23 5 6 1 β β 12
Dec. β 5 5 3 β 13 3 9 3 β β 15
Jan. 3 7 8 5 β 23 2 4 β β β 6
Feb. 2 9 10 6 β 27 1 7 β β β 8
Total 31 96 110 52 11 300 29 65 11 β β 105
%age 10.03 32.0 36.67 17.34 3.66 27.62 61.90 10.48 β β
Table 3(B) : Population fluctuation (size distribution) of snails at Asan Barrage (L-1) locality of Doon Valley during March 2003 to February 2004
Lymnaea (P.) acuminata f. chlamys (Benson, 1836) Lymnaea (P.) acuminata f. patula (Troschel, 1837) Speciesβ
Monthsβs < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 10 15 2 β β 27 4 11 1 β β 16
Apr. 10 16 1 β β 27 7 10 2 β β 19
May 15 20 3 β β 38 8 13 2 β β 23
Jun. 12 20 4 β β 36 5 12 3 β β 20
Jul. 12 8 2 β β 22 5 8 β β β 13
Aug. 10 7 1 β β 18 6 7 β β β 13
Sep. 5 14 β β β 19 6 11 β β β 17
Oct. 7 15 β β β 22 7 12 1 β β 20
Nov. 6 16 1 β β 23 10 13 2 β β 25
Dec. 5 15 1 β β 21 6 9 1 β β 16
Jan. 7 11 β β β 18 4 6 β β β 10
Feb. 6 13 2 β β 21 5 10 1 β β 16
Total 105 170 17 β β 292 73 122 13 β β 208
%age 39.39 54.78 5.83 β β 35.10 58.65 6.25 β β
Contd . . .
Table 3 (B) contd . . .
Thiara (M.) tuberculata (Mueller, 1774) Indoplanorbis exustus (Deshayes, 1834) Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 4 8 12 5 β 29 3 8 β β β 11
Apr. 5 11 10 6 2 34 3 6 β β β 9
May 4 12 8 5 3 32 2 5 1 β β 8
Jun. 6 12 9 4 1 32 3 7 1 β β 11
Jul. 4 5 7 2 3 21 3 4 2 β β 9
Aug. 6 7 5 2 β 20 β 4 β β β 4
Sep. 7 12 4 6 β 29 2 2 1 β β 5
Oct. 6 10 12 5 2 35 3 4 β β β 7
Nov. 7 12 7 2 β 28 5 6 β β β 11
Dec. 4 6 5 3 β 18 4 8 2 β β 14
Jan. 5 6 5 3 β 19 3 4 β β β 7
Feb. 3 5 8 5 2 23 3 5 β β β 8
Total 61 106 92 48 13 320 34 63 7 β β 104
%age 19.05 33.12 28.78 15.78 4.05 33.01 60.38 6.61 β β
Table 4(A) : Population fluctuation (size distribution) of snails at Sahaspur (L-2) locality of Doon Valley during March 2002 to February 2003
Bellamya bengalensis f. typica (Lamarck, 1882) Bellamya dissimilis (Mueller, 1774) Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. β 6 7 8 4 25 β 3 3 4 2 12
Apr. β 5 7 6 4 22 1 4 4 2 2 13
May 1 4 5 8 5 23 β 2 4 4 3 13
Jun. 1 4 5 6 3 19 β 3 4 2 β 9
Jul. β 5 3 3 2 13 2 3 2 1 β 8
Aug. β β β β β β β β β β β β
Sep. β β 2 5 β 7 β 2 2 3 β 7
Oct. 2 β 2 2 1 7 1 2 3 β β 6
Nov. 2 2 3 2 1 10 2 3 3 2 1 11
Dec. 1 2 1 1 2 7 1 2 1 2 1 7
Jan. β 4 2 4 β 10 β 5 5 4 3 17
Feb. β 3 6 3 2 14 β 2 4 4 3 13
Total 7 35 43 48 24 157 7 31 35 28 15 116
%age 4.45 22.3 27.37 30.56 15.27 6.04 26.72 30.18 24.13 12.93
Contd . . .
Table 4(A) contd . . .
Thiara (M.) tuberculata (Mueller, 1774) Lymnaea sp. Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 4 10 11 4 2 31 5 8 2 β β 15
Apr. 3 15 15 3 3 39 6 10 2 β β 18
May 5 10 17 6 3 41 5 13 3 β β 21
Jun. 8 11 15 6 β 40 4 15 2 β β 21
Jul. β 8 10 4 1 23 8 3 β β β 11
Aug. β 7 8 5 β 20 6 7 β β β 13
Sep. 5 10 9 4 β 28 8 11 β β β 19
Oct. 8 9 11 5 β 33 5 13 β β β 18
Nov. 4 12 17 10 4 47 5 10 1 β β 16
Dec. 3 8 12 8 2 33 β 14 2 β β 16
Jan. 3 11 11 3 β 28 2 12 3 β β 17
Feb. 2 12 14 3 1 32 β 18 2 β β 20
Total 45 123 150 61 16 395 54 134 17 β β 205
%age 11.39 31.13 37.98 15.44 4.05 26.34 65.36 8.30 β β
Table 4(B) : Population fluctuation (size distribution) of snails at Sahaspur (L-2) locality of Doon Valley during March 2003 to February 2004
Bellamya bengalensis f. typica (Lamarck, 1882) Bellamya dissimilis (Mueller, 1774) Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 1 7 6 9 5 28 1 4 4 3 2 14
Apr. β 4 8 7 6 25 1 6 3 4 3 17
May 2 2 7 8 4 23 3 4 3 2 1 13
Jun. 1 4 6 6 5 22 1 2 2 3 1 9
Jul. 1 4 4 8 2 19 β 1 3 2 1 7
Aug. β 2 3 2 β 7 β β 3 2 β 5
Sep. β 3 2 3 β 8 2 3 3 β β 8
Oct. β 4 4 5 β 13 2 2 2 1 β 7
Nov. 2 5 3 4 2 16 β 4 4 2 1 11
Dec. 2 4 6 3 β 15 β 3 5 4 1 13
Jan. 1 3 4 4 1 13 β 6 6 5 2 19
Feb. β 2 5 2 2 11 2 5 7 5 4 23
Total 10 44 58 61 27 200 12 40 45 33 16 146
%age 5 22 29 30.5 13.5 8.27 27.58 31.04 22.76 10.35
Contd . . .
Table 4 (B) contd . . .
Thiara (M.) tuberculata (Mueller, 1774) Lymnaea sp. Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 4 12 11 5 3 35 4 10 2 β β 16
Apr. 4 15 16 10 5 50 5 10 3 β β 18
May 6 12 17 7 4 46 5 12 3 β β 20
Jun. 4 15 16 4 3 42 4 12 2 β β 18
Jul. 3 10 13 10 3 39 10 β β β β 10
Aug. β 7 7 8 β 22 7 5 β β β 12
Sep. 6 10 8 4 β 28 8 10 β β β 18
Oct. 10 9 12 6 β 37 5 15 β β β 20
Nov. 7 10 7 5 β 29 3 12 1 β β 16
Dec. β 12 15 3 1 31 β 12 2 β β 14
Jan. 4 10 10 4 β 28 2 14 3 β β 19
Feb. 3 11 15 4 2 35 β 17 3 β β 20
Total 51 133 147 70 21 422 53 129 19 β β 201
%age 12.09 31.52 34.84 16.56 4.98 26.37 64.18 9.45 β β
Table 5 (A) : Population fluctuation (size distribution) of snails at Dudhli (L-3) locality of Doon Valley during March 2002 to February 2003
Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 3 5 8 7 2 25 4 6 5 3 1 19
Apr. 2 8 11 9 2 32 β 9 7 5 2 23
May β 12 15 10 3 40 2 10 9 4 1 26
Jun. 2 15 17 7 3 44 β 12 10 2 3 27
Jul. β 11 8 11 4 34 3 8 6 3 β 20
Aug. β 12 9 7 β 28 4 5 5 2 β 16
Sep. 4 6 7 5 β 22 3 5 3 2 β 13
Oct. 7 10 8 4 1 30 3 6 5 3 1 18
Nov. 3 7 7 5 2 24 2 5 3 1 1 12
Dec. β 10 5 3 β 18 β 6 2 1 β 9
Jan. 3 7 6 4 β 20 β 4 3 3 β 10
Feb. 6 5 7 8 1 27 2 6 4 4 β 16
Total 30 108 108 80 18 344 23 82 62 33 9 209
%age 8.72 31.40 31.40 23.25 5.23 11.00 39.24 29.66 15.79 4.31
Contd . . .
Table 5(A) contd . . .
Lymnaea (P) acuminata f. patula (Troschel, 1837) Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 5 5 2 β β 12
Apr. 7 8 2 β β 17
May 4 6 1 β β 11
Jun. 2 5 2 β β 9
Jul. β 3 β β β 3
Aug. β β β β β β
Sep. 4 1 β β β 5
Oct. β 3 2 β β 5
Nov. 3 3 1 β β 7
Dec. 1 2 β β β 3
Jan. 3 4 β β β 7
Feb. 4 5 1 β β 10
Total 33 45 11 β β 89
%age 37.07 50.57 12.36 β β
Table 5 (B) : Population fluctuation (size distribution) of snails at Dudhli (L-3) locality of Doon Valley during March 2003 to February 2004
Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 5 8 10 7 2 32 3 5 5 3 2 18
Apr. 4 11 10 9 2 36 β 10 6 6 3 25
May 5 11 12 10 3 41 2 6 7 5 2 22
Jun. 4 15 14 8 4 45 β 9 5 4 1 19
Jul. 6 10 12 11 1 40 2 5 6 4 β 17
Aug. β 14 11 7 β 32 4 5 3 2 β 14
Sep. 3 6 9 5 1 24 6 7 3 3 β 19
Oct. 9 8 11 3 β 31 5 8 4 2 2 21
Nov. 5 8 10 4 β 27 4 7 3 2 β 16
Dec. β 8 9 4 β 21 β 8 4 3 β 15
Jan. 4 5 6 3 β 18 β 3 2 2 β 7
Feb. 6 4 7 5 1 23 3 4 3 2 β 12
Total 51 108 121 76 14 370 29 77 51 38 10 205
%age 13.78 29.18 32.72 20.54 3.78 14.14 37.56 24.88 18.54 4.88
Contd . . .
Table 5 (B) contd. . . .
Lymnaea (P) acuminata f. patula (Troschel, 1837) Speciesβ Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 4 7 1 β β 12
Apr. 3 8 2 β β 13
May 2 12 β β β 14
Jun. 3 8 1 β β 12
Jul. 4 2 β β β 6
Aug. 3 β β β β 3
Sep. 3 2 β β β 5
Oct. β 5 2 β β 7
Nov. 3 4 1 β β 8
Dec. 3 2 β β β 5
Jan. 3 3 1 β β 7
Feb. 4 4 1 β β 9
Total 34 58 9 β β 101
%age 33.66 57.43 8.91
Table 6 (A) : Population fluctuation (size distribution) of snails at Lacchiwala (L-4) locality of Doon Valley during March 2002 to February 2003
Thiara (M.) tuberculata (Muller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 3 10 12 6 β 31 5 5 10 2 2 24
Apr. β 15 18 7 4 44 3 8 12 3 β 26
May 4 16 15 9 4 48 4 12 11 5 1 33
Jun. 5 18 20 12 5 60 2 15 9 7 2 35
Jul. 7 13 13 9 4 46 β 14 11 4 1 30
Aug. β 10 8 3 1 22 β 10 7 3 β 20
Sep. β 8 10 5 3 26 β 11 8 3 β 22
Oct. 3 10 11 5 β 29 2 8 5 2 β 17
Nov. 5 15 12 4 1 37 3 7 7 β β 17
Dec. β 5 10 2 1 18 β 5 6 β β 11
Jan. 4 8 11 3 β 26 3 7 4 5 1 20
Feb. 6 10 10 4 2 32 5 6 9 3 β 23
Total 37 138 150 69 25 419 27 108 99 37 7 278
%age 8.84 32.94 35.79 16.47 5.96 9.71 38.85 35.61 13.31 2.52
Table 6 (B) : Population fluctuation (size distribution) of snails at Lacchiwala (L-4) locality of Doon Valley during March 2003 to February 2004
Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 5 15 17 6 β 43 6 8 12 2 β 28
Apr. 8 19 15 6 β 48 4 11 12 5 β 32
May 9 15 20 9 3 56 7 15 10 7 β 39
Jun. 8 12 18 10 5 53 4 12 15 4 2 37
Jul. 7 12 17 12 5 53 4 12 8 3 3 30
Aug. β 8 12 8 4 32 β 8 5 7 1 21
Sep. β 12 15 5 2 34 β 12 8 4 β 24
Oct. 5 18 13 4 β 40 2 15 12 β β 29
Nov. 2 10 15 3 β 30 β 10 8 3 β 21
Dec. β 8 13 4 2 27 β 8 10 β β 18
Jan. 2 5 10 3 β 20 β 5 3 2 β 10
Feb. 2 7 8 4 1 22 2 4 7 2 1 16
Total 48 141 173 74 22 458 29 120 110 39 7 305
%age 13.0 30.78 37.77 16.15 4.86 9.50 39.34 36.06 12.80 2.30
Table 7 (A) : Population fluctuation (size distribution) of snails at Gularghati (L-5) locality of Doon Valley during March 2002 to February 2003
Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 3 8 12 6 3 32 2 4 6 2 β 14
Apr. β 10 16 9 4 39 β 7 4 3 1 15
May 3 15 18 7 3 46 3 9 5 3 2 22
Jun. 2 18 16 10 4 50 β 6 6 4 2 18
Jul. 3 12 15 6 2 38 2 4 3 2 β 11
Aug. 5 7 9 3 β 24 3 5 3 1 β 12
Sep. 7 8 10 6 β 31 5 4 6 1 β 16
Oct. 4 10 13 7 2 36 3 7 4 3 β 17
Nov. 2 7 10 4 β 23 2 4 3 3 1 13
Dec. β 8 10 3 1 22 β 5 4 2 β 11
Jan. β 8 10 3 β 21 β 3 5 2 β 10
Feb. 3 10 11 5 1 30 1 4 6 1 1 13
Total 32 121 150 69 20 392 21 62 55 27 7 172
%age 8.16 30.87 38.26 17.60 5.11 12.21 36.05 31.97 15.70 4.07
Table 7 (B) : Population fluctuation (size distribution) of snails at Gularghati (L-5) locality of Doon Valley during March 2003 to February 2004
Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Speciesβ
Monthsβ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total
Mar. 4 9 12 8 2 35 2 5 4 3 β 14
Apr. β 13 16 10 3 42 β 8 5 2 2 17
May 4 15 18 8 4 49 3 8 6 4 3 24
Jun. 4 17 15 12 5 53 β 7 5 5 3 20
Jul. 3 10 11 8 2 34 4 4 5 3 β 16
Aug. 5 11 8 5 β 29 3 5 2 2 β 12
Sep. 6 7 10 4 β 27 4 3 4 1 β 12
Oct. 7 9 11 5 1 33 4 6 3 5 β 18
Nov. 5 10 15 5 β 35 3 6 2 4 1 16
Dec. β 8 12 4 1 25 1 5 3 2 β 11
Jan. 2 5 8 3 β 18 β 3 3 4 β 10
Feb. 4 8 10 5 2 29 1 4 4 3 β 12
Total 44 122 146 77 20 409 25 64 46 38 9 182
%age 10.76 29.82 35.70 18.83 4.89 13.73 35.16 25.28 20.88 4.95
Table 3(a) : Population fluctuation (size distribution) of snails from Asan Barrage locality of Doon Valley during March 2002 to February 2003
S.No. Name of Locality Lym. (P)
acuminata f. chlamys
Lym. (P) acuminata f. patula
Lymnaea sp.
Bellamya bengalensis
Bellamya dissimilis
Thiara (M) tubrculata
Thiara sp.
Indoplanorbis exustus
Total
2002 β 2003
1. Asan Barrage 292 208 β β β 320 β 106
2. Sahaspur β β 205 157 113 339 β β
3. Dudhli β 89 β β β 332 218 β
4. Lacchiwala β β β β β 419 278 β
5. Gularghati β β β β β 392 172 β
Total 292 297 205 157 113 1802 668 106 3640
2003 β 2004
1. Asan Barrage 265 181 β β β 300 β 105
2. Sahaspur β β 201 200 145 442 β β
3. Dudhli β 101 β β β 370 205 β
4. Lacchiwala β β β β β 458 305 β
5. Gularghati β β β β β 400 182 β
Total 265 282 201 200 145 1950 792 105 3940
Table 8 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Asan Barrage (L-1) Locality of Doon Valley during March 2002 to February 2003
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 28 22 1 4.54 + β
Apr. 32 28 β β β β
May 28 25 β β β β
Jun. 30 20 β β β β
Jul. 24 18 β β β β
Aug. 14 14 1 7.14 + β
Sep. 20 15 1 6.66 + β
Oct. 38 20 2 10.00 + β
Nov. 23 13 2 15.38 + β
Dec. 13 10 1 10.00 β +
Jan. 23 15 1 6.66 β +
Feb. 27 20 1 5.0 + β
300 220 10
Table 8 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Asan Barrage (L-1) Locality of Doon Valley during March 2003 to February 2004
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 29 25 1 4.00 + β
Apr. 34 25 β β β β
May 32 30 β β β β
Jun. 32 28 β β β β
Jul. 21 25 β β β β
Aug. 20 15 1 6.66 + β
Sep. 29 17 1 5.88 + β
Oct. 35 23 2 8.70 + β
Nov. 28 18 2 11.11 + β
Dec. 18 15 2 13.33 + β
Jan. 19 16 1 6.25 + β
Feb. 23 20 1 5.0 + β
320 267 11
Table 9 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Sahaspur (L-2) Locality of Doon Valley during March 2002 to February 2003
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 31 26 2 7.61 β +
Apr. 39 25 1 3.33 + β
May 41 30 β β β β
Jun. 40 35 β β β β
Jul. 23 20 β β β β
Aug. 20 16 1 6.25 + β
Sep. 28 20 2 10.00 + β
Oct. 33 25 3 12.00 + β
Nov. 47 30 5 16.66 + +
Dec. 23 18 3 16.66 β +
Jan. 28 20 2 10.00 β +
Feb. 32 25 2 8.00 + β
395 290 21
Table 9 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Sahaspur (L-2) Locality of Doon Valley during March 2003 to February 2004
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 35 30 2 6.66 β +
Apr. 50 30 1 3.33 + β
May 46 35 β β β β
Jun. 42 35 β β β β
Jul. 39 30 β β β β
Aug. 22 17 1 5.88 + β
Sep. 28 25 2 8.00 + β
Oct. 37 30 3 10.00 + +
Nov. 29 25 4 16.00 + +
Dec. 31 20 3 15.00 + β
Jan. 28 20 3 15.00 + β
Feb. 35 25 2 8.00 β +
422 322 21
Table 10 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Dudhli Locality (L-3) of Doon Valley during March 2002 to February 2003
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 25 20 2 10.00 β +
Apr. 32 25 2 8.00 + β
May 40 30 1 3.33 + β
Jun. 44 30 1 3.33 + β
Jul. 34 25 2 8.00 + β
Aug. 28 20 2 10.00 β +
Sep. 22 15 3 20.00 β +
Oct. 30 20 5 25.00 + +
Nov. 24 20 6 30.00 + +
Dec. 18 15 4 26.00 + β
Jan. 20 15 3 20.00 + β
Feb. 27 20 3 15.00 β +
344 255 34
Table 10 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Dudhli (L-3) Locality of Doon Valley during March 2003 to February 2004
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 32 25 3 12.00 + β
Apr. 36 25 2 8.00 + β
May 41 30 β β β β
Jun. 45 30 β β β β
Jul. 40 30 2 6.66 β +
Aug. 32 25 3 12.00 β +
Sep. 24 20 3 15.00 + β
Oct. 31 25 5 20.00 + +
Nov. 27 20 6 30.00 + +
Dec. 21 15 4 26.66 + β
Jan. 18 15 3 20.00 + β
Feb. 23 18 3 16.66 β +
370 278 34
Table 11 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Lacchiwala (L-4) Locality of Doon Valley during March 2002 to February 2003
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 31 20 2 10 + β
Apr. 44 25 2 8 + β
May 48 30 β β β β
Jun. 60 25 β β β β
Jul. 46 30 1 3.33 + β
Aug. 22 20 1 5.00 + β
Sep. 26 20 3 15.00 + β
Oct. 29 25 5 20.00 + +
Nov. 37 28 7 25.00 + +
Dec. 18 15 3 20.00 β +
Jan. 26 20 3 15.00 + β
Feb. 32 25 3 12.00 + β
419 28.3 30
Table 11 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Lacchiwala (L-4) Locality of Doon Valley during March 2003 to February 2004
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 43 30 3 13.33 + +
Apr. 48 35 2 5.73 + β
May 56 30 β β β β
Jun. 53 25 β β β β
Jul. 53 25 1 4.00 + β
Aug. 32 20 3 15.00 + β
Sep. 34 25 5 20.00 + +
Oct. 40 30 7 23.00 + +
Nov. 30 25 7 28.00 + +
Dec. 27 18 4 22.22 β +
Jan. 20 15 3 20.00 β +
Feb. 22 15 2 13.33 + β
458 293 37
Table 12 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Gularghati (L-5) Locality of Doon Valley during March 2002 to February 2003
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 32 25 3 12 + +
Apr. 39 30 3 10 + β
May 46 35 β β β β
Jun. 50 30 β β β β
Jul. 38 30 2 6.66 + β
Aug. 24 20 3 15.00 + β
Sep. 31 25 5 20.00 + +
Oct. 36 25 6 24.00 + +
Nov. 23 20 5 25.00 + +
Dec. 22 18 3 16.00 β +
Jan. 21 15 2 13.33 + β
Feb. 30 20 2 10.00 + β
392 293 34
Table 12 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Gularghati (L-5) Locality of Doon Valley during March 2003 to February 2004
Number of Snails Types of Cercariae Recovered Months Collected Examined Infected
Infection Rate (%) Xiphidio cercaria Furcocercous
Mar. 35 22 2 9.09 β +
Apr. 42 25 1 4.00 + β
May 49 25 β β β β
Jun. 53 32 β β β β
Jul. 34 20 1 5.00 + β
Aug. 29 20 2 10.00 + β
Sep. 27 20 3 15.00 + β
Oct. 33 25 4 16.00 + +
Nov. 35 25 6 24.00 + +
Dec. 25 20 3 15.00 + β
Jan. 18 15 2 13.33 + β
Feb. 29 20 2 10.00 β +
409 269 26
Table13 (A) : Combined Mosquito Larval Density at Asan Barrage locality (L-1) of Doon Valley during March 2002 to February 2003
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 2 35 3 1 2 β 2.85 β 1.42 2.85 β 1.42 β β 1 β β
Apr 5 6 55 3 4 3 2 3.63 β 2.36 4.54 β 2.26 β β 1 1 β
May 5 7 60 2 5 2 4 5.00 β 2.91 3.33 β 2.33 β β 1 1 1
Jun 5 11 80 3 9 3 9 6.25 β 3.12 6.87 β 3.12 1.56 3.43 2 1 1
Jul 5 11 80 4 11 4 10 6.25 β 1.89 9.37 β 6.25 3.12 4.37 2 1 1
Aug 5 15 100 3 13 3 11 β β 2.00 7.50 β 5.00 β 5.00 2 1 1
Sep 5 10 75 3 9 3 9 6.00 β 3.00 6.00 β 4.66 2.0 4.00 2 1 1
Oct 5 7 60 3 6 3 5 3.33 β 1.66 5.41 β 3.75 2.08 β 1 1 1
Nov 5 5 50 2 4 2 2 3.00 β 1.50 4.00 β 3.00 β β 1 1 1
Dec 5 4 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 3 β β β β β β β β β β β β β β β β
Table 13 (B) : Combined Mosquito Larval Density at Asan Barrage locality (L-1) of Doon Valley during March 2003 to February 2004
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 3 40 3 1 1 1 2.25 β 1.25 1.87 β 1.50 β β 1 1 β
Apr 5 6 55 3 3 3 2 3.54 β 1.81 4.09 β 1.81 β β 1 1 β
May 5 8 65 2 5 2 3 5.38 β 3.07 3.84 β 3.00 1.15 β 1 1 1
Jun 5 10 75 3 8 3 6 5.33 β 4.00 6.00 β 4.00 2.00 2.66 2 1 1
Jul 5 11 80 4 9 3 9 6.25 β 3.12 6.25 β 3.12 3.75 5.00 2 β β
Aug 5 13 90 4 9 3 9 β β 2.77 6.66 β 3.44 β 6.11 2 1 1
Sep 5 10 75 2 12 3 9 5.33 β 2.66 6.66 β 2.33 2.66 4.00 2 1 1
Oct 5 6 55 3 8 3 6 3.63 β 2.45 6.37 β 2.72 2.90 β 1 1 1
Nov 5 4 45 3 4 2 3 2.77 β 2.22 4.44 β 1.88 β β 1 β β
Dec 5 4 β β β β β β β β β β β β β β β β
Jan 5 3 β β β β β β β β β β β β β β β β
Feb 5 1 β β β β β β β β β β β β β β β β
Table 14 (A) : Combined Mosquito Larval Density at Sahaspur locality (L-2) of Doon Valley during March 2002 to February 2003
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 5 50 3 2 2 1 3.00 β 1.00 3.20 β 1.20 β β 1 1 β
Apr 5 5 50 3 4 3 2 5.00 β 2.00 4.60 β 3.00 β β 1 β β
May 5 7 65 2 7 2 5 5.45 4.07 2.53 5.33 β 3.61 β β 1 β 1
Jun 5 10 75 3 8 3 7 4.60 4.66 2.66 4.66 1.00 3.33 2.00 β 2 1 1
Jul 5 11 80 4 8 4 8 7.21 4.37 2.93 6.25 1.85 2.31 3.12 2.25 2 1 1
Aug 5 18 115 4 14 4 13 β 4.78 1.73 6.52 β 3.04 β 4.34 3 1 1
Sep 5 13 90 3 10 2 8 5.00 5.55 1.66 6.66 1.11 1.94 2.50 6.66 3 1 1
Oct 5 10 25 3 7 3 7 4.62 β 1.66 6.00 β 2.80 β 5.33 2 1 1
Nov 5 6 55 2 4 1 3 3.81 β 1.36 4.54 β 2.72 β β 1 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 5 β β β β β β β β β β β β β β β β
Table 14 (B) : Combined Mosquito Larval Density at Sahaspur locality (L-2) of Doon Valley during March 2003 to February 2004
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 4 45 3 1 2 1 3.88 β 0.77 2.77 β 1.11 β β 1 1 1
Apr 5 5 50 2 3 1 2 4.00 1.50 1.50 β β 1.20 β β 1 1 1
May 5 7 60 3 4 2 3 5.00 2.08 2.50 2.50 β 2.08 β β 2 β 1
Jun 5 7 60 4 7 3 4 7.08 3.33 3.33 5.00 1.25 2.66 1.25 β 2 β 1
Jul 5 11 80 3 10 3 8 5.00 2.50 1.56 5.62 1.37 1.87 1.25 3.12 3 1 1
Aug 5 15 100 4 12 3 10 5.00 2.50 1.50 6.00 β 2.25 1.35 4.00 4 1 1
Sep 5 15 100 4 8 3 5 6.00 2.10 1.50 5.00 0.75 1.50 β 4.50 4 1 1
Oct 5 10 75 3 5 3 3 6.00 2.33 1.46 4.66 β 1.26 β 5.00 3 1 1
Nov 5 5 50 2 5 2 3 4.00 β 1.50 β β 2.00 β β 2 1 1
Dec 5 4 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 5 β β β β β β β β β β β β β β β β
Table 15 (A) : Combined Mosquito Larval Density at Dudhli locality (L-3) of Doon Valley during March 2002 to February 2003
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 4 45 3 2 2 1 5.00 β 2.22 4.44 β 2.22 β β 1 β 1
Apr 5 8 65 3 6 3 4 4.51 β 3.07 3.84 0.76 2.70 β β 1 β 1
May 5 9 70 2 8 2 6 5.71 β 3.21 4.64 0.85 2.85 β β 1 1 β
Jun 5 13 90 3 11 3 10 5.55 β 3.05 5.55 0.66 3.88 1.36 4.44 2 1 1
Jul 5 17 110 4 15 4 12 5.70 β 2.13 5.45 0.45 4.54 1.66 4.54 3 1 1
Aug 5 19 120 4 18 3 17 β β 2.08 6.25 0.62 4.60 2.10 5.00 4 1 1
Sep 5 14 95 3 12 3 10 6.31 β 1.70 5.80 0.42 5.26 2.00 3.15 4 β 1
Oct 5 10 75 2 8 2 7 5.33 β 1.60 5.0 β 4.00 2.30 β 3 1 1
Nov 5 8 65 2 6 2 5 3.84 β 1.53 3.84 β 3.8 β β 2 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 5 β β β β β β β β β β β β β β β β
Table 15 (B) : Combined Mosquito Larval Density at Dudhli locality (L-3) of Doon Valley during March 2003 to February 2004
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 5 50 2 3 2 2 3.80 β 1.80 4.50 β 1.50 β β 1 β 1
Apr 5 8 65 3 5 2 3 4.07 β 2.30 4.07 0.61 2.15 β β 1 β 1
May 5 10 75 2 8 3 5 5.00 β 3.0 4.00 1.13 2.46 1.33 β 1 1 1
Jun 5 15 100 4 10 2 10 5.50 β 3.0 4.75 0.75 2.25 1.60 β 2 1 1
Jul 5 15 100 4 12 3 10 6.00 β 2.45 5.50 0.85 4.00 2.25 2.95 3 1 1
Aug 5 19 120 3 17 2 15 β β 2.12 6.25 0.50 4.16 β 5.00 4 1 1
Sep 5 15 100 3 11 2 10 5.50 β 1.90 5.00 β 4.00 β 5.00 3 1 1
Oct 5 12 85 2 8 2 5 3.52 β 1.17 3.82 β 2.64 1.64 4.11 2 1 1
Nov 5 7 60 2 5 1 3 2.91 β β 3.75 β 2.66 1.25 β 2 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 5 β β β β β β β β β β β β β β β β
Table 16 (A) : Combined Mosquito Larval Density at Lacchiwala locality (L-4) of Doon Valley during March 2002 to February 2003
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 3 40 3 2 2 1 3.12 β 1.87 2.50 β 4.37 β β 1 β 1
Apr 5 5 50 3 4 3 2 4.00 β 2.70 5.00 β 5.00 β β 1 1 β
May 5 8 65 2 7 2 6 5.76 β 2.69 6.92 β 4.61 β β 1 1 1
Jun 5 12 85 3 10 3 7 5.88 2.35 3.82 5.88 β 4.41 β 2.64 2 1 1
Jul 5 13 90 4 11 4 10 β 3.61 3.88 5.82 β 4.16 β 5.55 2 1 1
Aug 5 17 110 4 15 4 12 β 3.18 1.81 5.90 β 5.00 β 5.00 3 1 1
Sep 5 13 90 4 10 4 8 2.77 2.77 1.77 5.83 β 2.88 β 4.55 3 1 1
Oct 5 10 75 3 7 3 5 2.80 β 1.66 5.33 β 3.66 β 3.33 2 1 1
Nov 5 6 55 3 5 2 4 2.72 β 0.90 4.54 β 2.72 β β 2 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 4 β β β β β β β β β β β β β β β β
Table 16 (B) : Combined Mosquito Larval Density at Lacchiwala locality (L-4) of Doon Valley during March 2003 to February 2004
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 2 35 3 1 3 1 4.28 β 2.85 β β 5.00 β β 1 β 1
Apr 5 5 50 3 3 3 2 5.0 β 2.90 4.50 β 4.50 β β 1 1 1
May 5 7 60 3 4 3 3 5.83 β 1.66 5.83 β 5.00 β β 1 1 β
Jun 5 10 75 4 8 3 6 5.33 β 4.66 6.00 β 5.33 β 2.66 2 1 1
Jul 5 12 85 4 10 4 8 β 2.35 5.30 5.87 β 5.58 β 4.37 3 1 1
Aug 5 15 100 4 15 4 13 β 2.75 3.75 6.00 β 625 β 6.00 3 1
Sep 5 13 90 3 10 2 9 3.61 3.44 3.33 6.71 β 3.88 β 3.88 2 1 1
Oct 5 9 70 3 6 3 2 2.85 β 2.78 5.64 β 4.14 β 3.21 1 1 1
Nov 5 6 55 2 4 1 1 2.27 β 1.36 4.01 β 4.00 β β 1 β 1
Dec 5 4 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 2 β β β β β β β β β β β β β β β β
Table 17 (A) : Combined Mosquito Larval Density at Gularghati locality (L-5) of Doon Valley during March 2002 to February 2003
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 6 55 3 3 3 2 1.81 β 0.90 2.27 β 2.72 β β 1 β 1
Apr 5 6 55 3 4 3 2 3.62 β 1.36 4.36 1.18 3.81 β β 1 β 1
May 5 9 70 2 7 2 6 3.92 β 1.07 5.00 1.21 4.28 β β 1 1 1
Jun 5 11 80 3 9 3 7 6.25 β 2.0 5.26 1.25 4.06 β β 2 1 1
Jul 5 14 95 4 12 4 11 3.68 2.63 2.10 5.62 1.21 4.21 β 2.63 2 1 1
Aug 5 19 120 4 16 4 14 β 4.62 1.96 6.84 0.83 4.16 β 3.33 3 1 2
Sep 5 15 100 3 11 3 10 2.75 5.00 1.75 5.00 β 7.50 β 4.50 3 1 2
Oct 5 12 85 3 9 3 7 2.35 2.35 1.25 4.79 β 3.05 β 3.52 2 1 1
Nov 5 8 65 2 5 1 3 1.92 β 0.76 3.84 β 2.69 β β 2 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 4 β β β β β β β β β β β β β β β β
Feb 5 4 β β β β β β β β β β β β β β β β
Table 17 (B) : Combined Mosquito Larval Density at Gularghati locality (L-5) of Doon Valley during March 2003 to February 2004
Positive breeding Breeding sites
Larval Pupae Breeding Habitats No. of mosquito species
recovered Month
Fixed Random
No. of dips
Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex
Mar 5 5 50 3 2 3 1 2.70 β 1.70 2.50 1.50 2.50 β β 1 1 1
Apr 5 7 60 3 4 3 2 2.91 β 2.08 3.33 1.50 2.66 β β 1 β 1
May 5 7 60 4 4 3 4 4.16 β 2.25 5.00 1.50 β β β 1 1 1
Jun 5 10 75 3 8 3 6 4.66 β 2.60 5.00 0.93 2.66 β β 2 1 1
Jul 5 15 100 4 10 4 8 3.50 2.00 2.25 5.00 1.00 2.90 β 3.00 2 1 1
Aug 5 15 100 4 11 4 10 β 3.00 2.00 6.25 β 3.50 β 5.00 3 1 1
Sep 5 10 75 3 7 2 5 3.33 1.66 2.66 6.00 β 3.33 β 6.00 3 1 1
Oct 5 5 50 3 3 2 1 4.00 β 2.25 4.00 β 3.50 β 4.00 2 1 1
Nov 5 3 40 2 2 2 1 3.75 β 1.87 3.75 β β β β 2 1 1
Dec 5 5 β β β β β β β β β β β β β β β β
Jan 5 5 β β β β β β β β β β β β β β β β
Feb 5 5 β β β β β β β β β β β β β β β β
Table 18 (A) : Natural infection in Anopheles larvae at Asan Barrage locality (L-1) of Doon Valley during March 2002 to February 2003
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 20 β β β β 20 β β β β 10 β β β β β β β β β 8 β β β β
Apr 50 6.0 4.0 β β 30 3.33 β β β 20 β β β 10.00 β β β β β 15 β β β β
May 40 5.00 β 5.00 2.50 50 4.0 β β 2.0 30 6.66 β 3.13 6.66 β β β β β 25 β β β β
Jun 90 7.77 3.33 2.22 3.33 70 7.14 2.85 5.71 β 22 4.54 9.0 β β 40 5.0 2.50 β 5.0 40 2.50 β 2.50 β
Jul 100 11.00 3.00 4.00 β 80 12.50 3.75 8.75 2.50 20 15.0 5.0 5.0 β 50 8.0 2.0 4.0 4.0 70 5.71 β 4.28 2.85
Aug 110 15.43 3.65 2.76 1.81 β β β β β 30 6.66 β β 6.66 70 10.0 4.28 5.71 4.28 80 12.30 2.50 β β
Sep 80 8.75 1.25 β β 60 11.66 1.66 5.0 3.33 20 5.0 β 5.0 β 50 6.0 β 2.0 β 40 5.0 β β 5.00
Oct 50 β β β 6.0 40 7.50 β β 5.0 10 β β β β β β β β β 30 3.33 β β β
Nov 30 3.33 3.33 β β 30 6.66 β β β 10 β β β β β β β β β 20 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 675 380 177 310 348
Table 18 (B) : Natural infection in Anopheles larvae at Asan Barrage (L-1) locality of Doon Valley during March 2003 to February 2004
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 15 β β β β 20 β β β β 8 β β β β β β β β β 10 β β β β
Apr 40 5.0 2.50 β 2.50 30 9.99 β β β 12 β β β β β β β β β 15 β β β β
May 50 6.0 2.0 β β 60 6.66 3.32 β 1.66 28 10.71 β β 3.57 β β β β β 35 β β β 5.71
Jun 80 6.25 2.25 1.25 1.25 60 5.00 1.66 5.00 3.22 40 10.0 2.50 2.50 β 30 10.00 3.33 β 10.0 45 4.44 2.22 β β
Jul 100 9.00 3.00 2.0 4.00 80 5.00 2.50 5.00 1.25 35 8.54 β 2.85 β 60 6.66 3.33 1.66 6.66 40 2.50 β β 2.50
Aug 120 14.16 4.16 2.50 2.50 β β β β β 30 β β β 6.66 80 7.56 3.75 2.50 β 60 5.0 β β β
Sep 70 8.57 2.87 2.87 β 60 3.33 1.66 β 3.33 25 4.0 4.0 β β 40 7.50 2.50 2.50 5.0 30 β 3.33 β β
Oct 40 2.50 β 2.50 β 25 4.00 β β 4.00 20 10.00 β β 10.00 β β β β β 22 4.54 β β β
Nov 30 β 3.33 β 3.33 20 β β β β 15 β β β β β β β β β 12 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 545 355 213 210 269
Table 19 (A) : Natural infection in Anopheles larvae at Sahaspur (L-2) locality of Doon Valley during March 2002 to February 2003
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 25 8.0 β β β 20 5.0 β β 5.0 10 β β β β β β β β β 10 β β β β
Apr 35 5.71 2.85 β 2.85 30 6.66 β β β 15 6.66 β β 6.66 β β β β β 25 8.00 β β 4.00
May 50 6.0 β β 6.00 45 6.66 2.22 2.22 β 25 8.00 4.00 β β β β β β β 30 10.00 3.33 β 3.33
Jun 75 9.33 5.33 5.33 2.66 60 8.33 3.33 3.33 5.00 33 12.12 3.03 6.06 β β β β β β 38 10.52 5.26 5.26 β
Jul 90 11.11 3.33 5.55 3.33 78 8.97 5.13 β 2.56 40 10.00 5.00 β β 30 10.00 3.33 3.33 6.66 30 6.66 3.33 β β
Aug 120 9.16 3.33 1.66 4.16 β β β β β 25 12.00 4.00 4.00 β 70 8.57 4.28 2.85 β 52 7.70 3.84 1.92 β
Sep 80 7.50 β β 3.50 70 7.14 2.85 2.85 β 20 10.00 β β 10.00 90 7.37 2.22 3.33 4.44 26 3.70 β β β
Oct 65 6.15 1.53 β β 55 5.45 β 1.81 3.62 20 50 β β 5.00 60 6.66 β 3.33 8.33 33 6.06 β 3.03 3.03
Nov 30 β β 3.33 β 28 β 3.60 β 7.20 10 β β β β β β β β β 20 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 570 386 198 250 264
Table 19 (B) : Natural infection in Anopheles larvae at Sahaspur (L-2) locality of Doon Valley during March 2003 to February 2004
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 20
10.00 β β 5.00 27 7.40 β β β 7 β β β β β β β β β 10 β β β β
Apr β β β β β 30 6.66 β β 3.33 10 β β β β β β β β β 10 β β β β
May 25 8 β β β 52 5.77 β 3.84 1.94 20 10 β β β β β β β β 21 4.76 β 4.76 5.71
Jun 50 8 2.00 4.00 2.00 60 8.33 1.66 β 6.66 33 6.06 β β 3.03 3.80 5.80 2.90 β 2.90 26 7.69 β β 3.84
Jul 72 6.94 2.84 4.16 β 67 6.00 2.98 4.47 β 20 15.00 5.00 β β 65 6.15 3.07 3.07 β 22 β 4.54 9.08 β
Aug 105 10.47 3.80 6.66 4.76 85 3.52 3.52 5.90 4.70 22 4.54 β β 1.08 72 6.94 1.39 4.16 1.39 40 3.50 2.25 β β
Sep 82 8.78 β 3.66 4.87 92 5.43 2.17 β 2.17 20 10.00 5.00 β β 52 3.04 β 3.84 5.77 29 6.90 3.45 3.45 β
Oct 55 3.63 1.81 β β 55 3.63 1.81 1.81 β 15 β β β β β β β β β 10 β β β β
Nov β β β β β 28 β β β 10.71 10 β β β β β β β β β 15 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 409 496 167 226 183
Table 2 : Diversity of snails in selected localities of Doon Valley during March 2002 to February 2004
Collection Sites L1 L2 L3 L4 L5
Total Snailβs species
2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 Family : Lymnaeidae Lymnaea (Pseudosuccinea) acuminata f. chlamys (Benson, 1836)
265 292 β β β β β β β β 265 292
Lymnaea (Pseudosuccinea) acuminata f. patula (Troschel, 1837)
181 208 β β 89 101 β β β β 270 310
Lymnaea sp. β β 205 201 β β β β β β 205 201 Family : Viviparidae Bellamya bengalensis f. typica (Lamarck, 1882)
β β 157 200 β β β β β β 157 200
Bellamya dissimilis (Mueller, 1774) β β 116 146 β β β β β β 116 146
Family : Thiaridae Thiara (Melanoides) tuberculata (Mueller, 1774)
300 320 395 422 344 370 419 458 392 409 1850 1979
Thiara sp. β β β β 209 205 278 305 172 182 659 792 Family : Planorbidae Indoplanorbis exustus (Deshayes, 1834) 105 104 β β β β β β β β 105 104
Total 851 924 873 969 642 676 697 763 564 591 3639 4011
L1
Lymnaea (P) acuminata f. chlamys Benson
Lymnaea (P) acuminata f. patula Troschel
Thiara (M) tuberculata Mueller
Indoplanorbis exustus Deshayes
Speciesβ
Monthsβ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04
Total
Mar. 26 27 16 16 28 29 8 11 161
Apr. 29 27 23 19 32 34 9 9 182
May 31 38 25 23 28 32 10 8 195
Jun. 36 36 23 20 30 31 11 11 198
Jul. 23 22 13 13 24 21 7 9 132
Aug. 13 18 7 13 14 20 5 4 94
Sep. 12 19 9 17 20 29 7 5 118
Oct. 22 22 16 20 38 35 7 7 167
Nov. 19 22 13 25 23 25 12 11 150
Dec. 16 21 12 16 13 19 15 14 126
Jan. 16 18 11 10 23 19 6 7 110
Feb. 22 21 14 16 27 23 8 7 138
Total 265 291 182 208 300 317 105 103 1771
L1 (Percentage)
Lymnaea (P) acuminata f. chlamys Benson
Lymnaea (P) acuminata f. patula Troschel
Thiara (M) tuberculata Mueller
Indoplanorbis exustus Deshayes
Speciesβ
Monthsβ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04
Mar. 9.81 9.28 8.79 7.69 10.14 9.15 7.62 10.68
Apr. 10.94 9.28 12.64 9.13 11.59 10.73 8.57 8.74
May 11.70 13.06 13.74 11.06 1.45 10.09 9.52 7.77
Jun. 13.58 12.37 12.64 9.62 10.87 9.78 10.48 10.68
Jul. 8.68 7.56 7.14 6.25 8.70 6.62 6.67 8.74
Aug. 4.91 6.19 3.85 6.25 5.07 6.31 4.76 3.88
Sep. 4.53 6.53 4.95 8.17 7.25 9.15 6.67 4.85
Oct. 8.30 7.56 8.79 9.62 13.77 11.04 6.67 6.80
Nov. 7.17 7.56 7.14 12.02 8.33 7.89 11.43 10.68
Dec. 6.04 7.22 6.59 7.69 4.71 5.99 14.29 13.59
Jan. 6.04 6.19 6.04 4.81 8.33 5.99 5.71 6.80
Feb. 8.30 7.22 7.69 7.69 9.78 7.26 7.62 6.80
L2
Bellamya bengalensis f. typica Lamarck
Bellamya dissimilis (Mueller) Thiara (M) tuberculata Mueller
Lymnaea sp. Speciesβ Monthsβ
2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04
Total
Mar. 25 28 12 14 31 35 15 16 176 Apr. 22 25 14 17 39 50 18 18 203 May 23 23 12 13 41 46 21 20 199 Jun. 18 22 9 9 40 42 21 18 179 Jul. 13 19 8 7 23 39 11 10 130 Aug. β 7 β 5 20 22 13 12 79 Sep. 7 8 5 8 28 28 19 18 121 Oct. 7 13 6 7 36 37 18 20 144 Nov. 10 16 11 11 47 29 16 16 156 Dec. 7 15 7 13 33 31 16 14 136 Jan. 10 13 17 19 28 28 17 19 151 Feb. 14 11 13 23 32 35 20 20 168 Total 156 200 114 146 398 422 205 201 1842
L3
Thiara (M) tuberculata Mueller Thiara sp. Lymnaea (P) acuminata f. patula Troschel
Speciesβ
Monthsβ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04
Total
Mar. 25 32 19 18 12 12 118 Apr. 32 36 23 25 17 13 146 May 40 41 26 22 11 14 154 Jun. 42 45 27 19 9 12 154 Jul. 34 40 20 17 3 6 120 Aug. 28 32 16 14 β 3 93 Sep. 22 24 13 19 5 5 88 Oct. 30 31 18 21 5 7 112 Nov. 24 27 12 16 7 8 94 Dec. 18 21 9 15 3 5 71 Jan. 20 18 10 7 7 7 69 Feb. 27 23 16 2 10 9 87 Total 342 370 209 195 89 101 1306
L4 Thiara (M) tuberculata Mueller Thiara sp. Speciesβ
Monthsβ 2002-03 2003-04 2002-03 2003-04
Total
Mar. 31 43 24 28 126
Apr. 44 54 26 32 156
May 48 5 33 42 128
Jun. 60 55 35 36 186
Jul. 45 48 30 27 150
Aug. 22 27 20 20 89
Sep. 26 31 23 24 104
Oct. 29 39 19 29 116
Nov. 37 33 17 22 109
Dec. 18 25 11 18 72
Jan. 26 20 19 10 75
Feb. 32 22 23 16 93
Total 418 402 280 304 1404
L5
Thiara (M) tuberculata Mueller Thiara sp. Speciesβ
Monthsβ 2002-03 2003-04 2002-03 2003-04
Total
Mar. 32 35 14 14 95
Apr. 39 42 15 17 113
May 46 49 22 24 141
Jun. 50 53 18 20 141
Jul. 38 32 11 16 97
Aug. 24 29 12 12 77
Sep. 31 27 16 12 86
Oct. 36 33 17 18 104
Nov. 23 35 13 16 87
Dec. 22 25 11 11 69
Jan. 21 18 10 10 59
Feb. 30 29 13 12 84
Total 392 407 172 182 1146
Table 2 : Faunal diversity of snails in riverine ecosystem of Doon Valley from March 2002 to February 2004
Name of the species Asan Barrage
Sahaspur Dudhli Lacchiwala Gularghati Total
March 2002 to Feb. 2003 Lymnaea (P) acuminate f. chlamys 292 β β β β 292
Lymnaea (P) acuminate f. patula 208 β 89 β β 297
Lymnaea sp. β 205 β β β 205
Bellamya bengalensis β 157 β β β 157
Bellamya dissimilis β 113 β β β 113
Thiara (M) tuberculata 320 339 332 419 392 1802
Thiara sp. β β 218 278 172 668
Indoplanorbis exustus 106 β β β β 106
March 2003 to Feb. 2004 Lymnaea (P) acuminate f. chlamys 265 β β β β 265
Lymnaea (P) acuminate f. patula 181 β 101 β β 282
Lymnaea sp.
β 201 β β β 201
Bellamya bengalensis
β 200 β β β 200
Bellamya dissimilis
β 145 β β β 145
Thiara (M) tuberculata 300 442 370 458 400 1950
Thiara sp.
β β 205 305 182 792
Indoplanorbis exustus
105 β β β β 105
Table 2 : Faunal diversity of snails in riverine ecosystem of Doon Valley from March 2002 to February 2004
Name of the species Asan Barrage
Sahaspur Dudhli Lacchiwala Gularghati Total
March 2002 to Feb. 2003 Lymnaea (P) acuminate f. chlamys 292 β β β β 292
Lymnaea (P) acuminate f. patula 208 β 89 β β 297
Lymnaea sp.
β 205 β β β 205
Bellamya bengalensis
β 157 β β β 157
Bellamya dissimilis
β 113 β β β 113
Thiara (M) tuberculata
320 339 332 419 392 1802
Thiara sp.
β β 218 278 172 668
Indoplanorbis exustus
106 β β β β 106
March 2003 to Feb. 2004 Lymnaea (P) acuminate f. chlamys 265 β β β β 265
Lymnaea (P) acuminate f. patula 181 β 101 β β 282
Lymnaea sp.
β 201 β β β 201
Bellamya bengalensis
β 200 β β β 200
Bellamya dissimilis
β 145 β β β 145
Thiara (M) tuberculata
300 442 370 458 400 1950
Thiara sp.
β β 205 305 182 792
Indoplanorbis exustus
105 β β β β 105
Table 28 : Chemical Characteristics of two different rearing media
Rearing Medium
Snail water Parameters
Tap water Lymnaea (P)
acuminata f. chlamys
Thiara (M) tuberculata
Bellamya bengalensis
f. typica
pH (moles/l) 7.05 8.1 7.05 7.10
Total hardness (mg/l) 31.6 44.2 39.5 42.3
Dissolved oxygen (mg/l) 5.4 5.2 4.5 3.6
Nitrogen ammonia (mg/l) 4.2 6.1 5.9 5.4
Nitrogen nitrite (mg/l) 1.05 1.8 1.3 0.9
Nitrogen nitrate (mg/l) 3.8 5.6 5.1 4.2
Table 20 (A) : Natural infection in Anopheles larvae at Dudhli (L-3) locality of Doon Valley during March 2002 to February 2003
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 32 12.50 β 3.12 3.12 30 6.66 β 3.33 β 13 β β β β β β β β β 15 β β β β
Apr 40 5.00 2.50 β β 43 4.65 β 4.65 2.32 25 8.00 4.00 β β β β β β β 22 8.00 β β 9.09
May 55 5.45 β β 1.81 62 6.45 1.61 β 3.22 22 9.09 β 13.13 β β β β β β 30 10.00 β 3.33 β
Jun 82 6.09 2.44 β 3.65 75 8.00 2.66 1.33 β 37 8.10 2.70 5.40 5.40 52 5.77 1.92 β 3.84 58 7.0 5.72 β β
Jul 105 6.66 2.85 2.85 1.90 98 8.17 2.04 3.61 1.02 32 12.50 β β 9.31 88 9.09 3.40 2.27 3.40 72 6.94 β 2.77 2.77
Aug 120 7.50 3.33 5.83 5.00 β β β β β 40 10.00 5.00 β 2.25 110 6.36 2.72 2.72 3.63 75 5.33 β 1.33 3.99
Sep 92 3.26 2.44 3.66 2.44 105 5.71 1.90 β β 28 β β 7.14 7.14 98 5.10 β 2.04 β 60 1.66 3.32 β β
Oct 45 β 2.22 β 2.22 63 6.35 β 3.17 1.58 18 5.55 β β 5.55 45 β 4.44 β 8.88 42 β β β 4.76
Nov 33 6.06 β 3.03 β 35 β β β β 12 β β β β β β β β β 37 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 604 511 247 393 411
Table 20 (B) : Natural infection in Anopheles larvae at Dudhli (L-3) locality of Doon Valley during March 2003 to February 2004
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 28
14.28 β β 7.04 30 β β 6.66 β 12 β β β β β β β β β 10 β β β β
Apr 43 6.97 β 2.32 2.32 40 5.00 β 2.25 5.00 20 5.00 β β 5.00 β β β β β 20 β β β β
May 60 β 1.66 β 3.98 58 5.17 β β 3.44 35 5.85 β 2.92 β β β β β β 42 7.14 β β β
Jun 80 6.25 2.50 β β 80 6.25 3.75 β 2.25 42 4.76 2.38 β 2.38 β β β β β 42 7.14 β 2.38 4.76
Jul 95 7.36 2.10 4.21 2.10 105 6.66 2.85 1.90 β 30 10.00 3.33 β 6.66 50 4.00 2.00 β 2.00 65 6.15 β 3.07 β
Aug 120 8.33 3.33 1.66 β β β β β β 45 8.88 β 4.44 2.22 100 7.00 3.00 β 4.00 82 7.31 β 2.43 2.45
Sep 82 4.87 β 3.65 2.43 88 4.54 2.27 2.27 3.40 28 7.14 3.42 β 7.14 80 6.25 2.25 3.75 2.25 64 6.25 β 3.12 β
Oct 48 2.08 2.08 β 4.16 40 5.00 β β 2.25 12 8.33 β β 8.33 55 3.33 β 3.33 β 30 β β β 3.33
Nov 35 β β 2.85 7.55 25 β β β 8.00 10 β β β β β β β β β 22 9.09 β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 591 466 224 285 360
Table 21 (A) : Natural infection in Anopheles larvae at Lacchiwala (L-4) locality of Doon Valley during March 2002 to February 2003
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 15 β β β β 20 β β β β 10 β β β β β β β β β 25 β β β β
Apr 37 β β β 5.67 32 6.25 β β 3.12 18 β β β β β β β β β 40 β β β β
May 78 5.13 2.28 4.56 β 63 4.76 1.58 3.06 β 25 8.00 β 4.00 4.00 β β β β β 45 β β β β
Jun 80 6.25 2.50 β 3.75 84 6.00 2.38 β 2.38 49 6.12 2.04 2.04 β 35 5.71 β 5.71 β 55 β β β β
Jul 92 4.35 2.17 2.17 1.08 β β β β β 58 7.69 3.84 β 1.92 78 5.13 1.28 1.28 2.56 63 3.17 β β β
Aug 115 4.35 2.60 β 3.50 β β β β β 32 9.37 β 6.25 β 92 6.25 2.17 β 2.17 75 β 1.33 2.66 β
Sep 85 8.23 2.35 1.17 2.35 37 8.10 2.70 2.70 β 25 8.00 β β 4.00 66 4.54 1.51 3.03 β 48 β β β β
Oct 68 5.90 β β 2.95 28 3.60 β β 3.60 18 β β β 5.55 30 3.33 β β 6.66 30 3.33 β β 6.66
Nov 32 β β β 6.25 20 β β β β 10 β β β β β β β β β 22 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 602 284 245 301 413
Table 21 (B) : Natural infection in Anopheles larvae at Lacchiwala (L-4) locality of Doon Valley during March 2003 to February 2004
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar β β β β β 25 8.00 β β 4.00 12 β β β β β β β β β 20 β β β β
Apr 30 6.66 β β β 42 4.76 β 2.38 β 20 β β β β β β β β β 42 β β β β
May 65 6.66 1.53 3.07 β 58 5.17 1.72 β 3.44 30 3.33 β β 3.33 β β β β β 45 β β β β
Jun 72 4.16 1.38 β 2.77 70 7.14 1.85 1.85 β 58 β β 3.45 β 30 6.66 β 1.33 β 68 β β β β
Jul 80 5.00 β 1.25 1.25 β β β β β 72 4.16 1.39 β 1.39 62 4.84 1.61 1.61 3.22 73 β β β β
Aug 120 5.00 1.66 1.66 2.50 β β β β β 55 3.63 β 2.81 β 103 4.85 2.42 β 2.91 90 β β β β
Sep 94 7.45 2.12 β 2.12 45 6.66 β β 6.66 42 2.38 β β 2.38 54 3.70 β 3.70 β 49 β β β β
Oct 62 4.83 β β 3.22 32 6.25 β 3.12 6.25 20 β β β β 28 3.60 β β β 35 β β β β
Nov 35 β 2.85 5.70 β 20 β β β 5.00 10 β β β β β β β β β 28 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 558 292 319 287 450
Table 22 (A) : Natural infection in Anopheles larvae at Gularghati (L-5) locality of Doon Valley during March 2002 to February 2003
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 20 β β β 5.00 15 β β β β 8 β β β β β β β β β 20 β β β β
Apr 35 β β β β 25 4.00 β β β 10 β β β β β β β β β 38 β β β β
May 60 3.33 1.66 1.66 - 40 5.00 β 5.00 β 10 β β β β β β β β β 45 4.44 β 2.22 β
Jun 72 4.25 β 2.77 β 84 4.76 1.19 2.38 2.38 26 β - β β β β β β β 55 5.45 1.81 β β
Jul 115 6.08 2.40 β 0.80 62 4.83 β 1.61 β 32 β β β β 40 5.00 2.25 2.25 β 62 3.22 1.61 β 1.61
Aug 124 5.64 1.61 0.80 1.61 β β β β β 37 β β β β 65 4.61 3.07 β 1.53 80 5.00 β 1.25 β
Sep 75 5.33 β 1.33 β 40 5.00 2.25 5.00 β 28 β β β β 78 6.41 2.56 1.28 β 98 4.08 2.04 β β
Oct 64 3.12 β β 1.56 28 β β 7.12 3.57 15 β β β β 48 4.16 β 2.08 β 32 6.25 β β β
Nov 42 β 2.38 β 4.76 15 β β β β 8 β β β β β β β β β 25 β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 507 319 166 231 455
Table 22 (B) : Natural infection in Anopheles larvae at Gularghati (L-5) locality of Doon Valley during March 2003 to February 2004
PI TA DR RF IC
Month No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao No.
Exam P N F Ao No. Exam P N F Ao
Mar 18 β β β β 20 8.00 β β β 10 β β β β β β β β β 18 β β β β
Apr 34 5.88 β β β 28 3.57 β 3.57 β 20 β β β β β β β β β 24 4.16 β β 4.16
May 52 3.84 β 1.92 β 47 4.25 2.12 β 2.12 22 β β β β β β β β β β β β β β
Jun 65 4.61 1.53 1.53 β 64 6.25 1.56 1.56 β 28 7.14 β β β β β β β β 31 6.45 β β β
Jul 84 4.76 1.90 β 1.90 55 7.27 3.63 β β 35 β β β β 43 6.97 β 4.65 β 38 7.90 β 2.63 β
Aug 105 5.71 2.65 0.95 β β β β β β 33 β β β β 84 4.76 2.38 β 3.57 57 7.01 1.75 1.75 β
Sep 78 6.89 β 3.44 1.72 44 β β 6.81 2.27 30 3.33 3.33 β β 67 5.96 1.49 2.98 β 42 7.13 2.34 β β
Oct 45 4.44 2.22 β β 32 5.00 β β 5.00 19 β β β β 32 6.25 β 3.08 3.08 28 3.57 β 3.57 β
Nov 24 β β 4.16 4.16 23 4.35 β β β 10 β β β β β β β β β β β β β β
Dec β β β β β β β β β β β β β β β β β β β β β β β β β
Jan β β β β β β β β β β β β β β β β β β β β β β β β β
Feb β β β β β β β β β β β β β β β β β β β β β β β β β
Total 415 313 207 226 238
Table 29 : Mean duration (h Β± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap
water with Scavenger snailβs [Lymnaea (P.) acuminata] secretion
Rearing Medium
Number of newly hatched larvae released
Larval instar Mean no. of larval stages
Duration of larval stage
% mortality of larval stage
Total mean duration of larval stage
Total mortality
Ist β 31.6 Β± 0.9 2.0 IInd 49.0 Β± 0.6 35.3 Β± 0.6 1.3 IIIrd 48.3 Β± 0.1 50.0 Β± 0.6 3.5
Snailβs water 150
IVth 46.6 Β± 0.3 54.3 Β± 0.1 4.3
169.0 11.5
Ist β 36.3 Β± 0.1 4.6 IInd 47.6 Β± 0.3 38.0 Β± 0.6 2.8 IIIrd 46.3 Β± 0.1 53.3 Β± 0.1 9.0
Tap water 150
IVth 42.3 Β± 0.1 62.6 Β± 0.9 9.3
190.2 25.7
Table 30 : Mean duration (h Β± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap
water with Scavenger snailβs [Thiara (M.) tuberculata] secretion
Rearing Medium
Number of newly hatched larvae released
Larval instar Mean no. of larval stages
Duration of larval stage
% mortality of larval stage
Total mean duration of larval stage
Total mortality
Ist β 34.6 Β± 0.8 3.3 IInd 48.3 Β± 0.01 36.3 Β± 0.6 2.7 IIIrd 47.0 Β± 0.6 53.6 Β± 0.9 4.3
Snail water 150
IVth 45 Β± 0.6 56.3 Β± 0.9 5.1
180.8 15.4
Ist β 36.3 Β± 0.1 4.6 IInd 47.6 Β± 0.3 38.0 Β± 0.6 2.8 IIIrd 46.3 Β± 0.1 53.3 Β± 0.1 9.0
Tap water 150
IVth 42.3 Β± 0.1 62.6 Β± 0.9 9.3
190.2 25.7
Table 31 : Mean duration (h Β± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap water with Scavenger snailβs (Bellamya bengalensis) secretion
Rearing Medium
Number of newly hatched larvae released
Larval instar Mean no. of larval stages
Duration of larval stage
% mortality of larval stage
Total mean duration of larval stage
Total mortality
Ist β 34.0 Β± 1.1 4.6 IInd 47.0 Β± 0.6 36.3 Β± 0.8 2.1 IIIrd 47.0 Β± 0.6 53.0 Β± 0.6 5.6
Snail water 150
IVth 45 Β± 0.6 57.0 Β± 0.9 6.0
180.8 18.3
Ist β 36.3 Β± 0.1 4.6 IInd 47.6 Β± 0.3 38.0 Β± 0.6 2.8 IIIrd 46.3 Β± 0.1 53.3 Β± 0.1 9.0
Tap water 150
IVth 42.3 Β± 0.1 62.6 Β± 0.9 9.3
190.2 25.7
Table 1 (A) : Climatological data* of the Doon Valley between March, 2002 to February, 2003
Temperature (0C) Average Humidity Month No. of Rainfall days
Rainfall (mm) Max. Min. Mean Max. Min.
March, 2002 2 63.1 27 10.8 18.9 90 41
April 3 65.6 32.7 14.4 23.5 73 29
May 4 28.7 35.3 18.9 26.4 73 39
June 12 134.2 35.8 21.1 26.7 78 54
July 8 121.5 32.8 22.7 27.1 86 64
August 18 483.3 30.3 22.7 25.8 93 75
September 11 275.9 29.2 13.3 23.2 92 70
October 5 54.9 29.2 13.3 20.8 93 52
November 0 0.0 25.8 8.1 16.5 96 45
December 0 0.3 22.8 04.8 13.1 98 43
January, 2003 4 36.0 19.7 03.3 11.1 99 45
February 5 79.8 21.5 06.7 14.1 96 44
Total 84 1343.3 342.1 160.1 247.2 1067 601 * Source of Data : Environment & Ecology Division , Forest Research Institute, P.O. New Forest, Dehradun
Table 1 (B) : Climatological data* of the Doon Valley between March, 2003 to February, 2004
Temperature (0C) Average Humidity Month No. of Rainfall days
Rainfall (mm) Max. Min. Mean Max. Min.
March, 2003 3 52.0 25.9 09.9 17.8 90 41
April 2 10.6 33.1 13.7 23.4 72 28
May 2 19.9 35.4 15.9 25.0 63 27
June 8 140.8 35.5 21.6 27.6 75 46
July 14 410.2 31.7 22.9 26.6 90 74
August 25 625.0 30.7 22.5 26.0 94 76
September 17 403.7 30.1 20.6 24.8 93 71
October 0 0.0 29.5 11.7 20.1 91 44
November 1 06.4 25.3 7.0 15.7 96 46
December 4 20.6 21.7 05.1 12.8 98 49
January, 2004 2 97.5 19.9 04.6 11.7 97 52
February 1 24.4 23.4 06.7 14.9 97 43
Total 79 1811.3 342.2 162.8 246.4 1056 597 * Source of Data : Environment & Ecology Division Forest Research Institute, P.O. New Forest, Dehradun
Table 23 : Physico-chemical and Biological Analysis of water samples at Asan Barrage (L-1) Locality of Doon Valley during January, 2003 to December, 2003
Macro-organism Micro-organism Month Depth
(cm) Temp. (00C)
pH Free CO2
(mg/l)
DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton
January 15 16 7.2 2.9 7.5 Fish Eichornia, Typha Protozoan Diatom, algae
February 14 20 7.0 2.8 7.4 Fish snail Eichornia, Hydrilla, Typha
Protozoan, Copepods Algae
March 11 22 7.2 3.0 7.5 Snail Eichornia, Hydrilla, Vallisnaria, Typha
Protozoan, Copepod, Cladoceran
Diatoms
April 10 26 7.3 3.1 7.0 Chironomous larvae. snails
Eihornia, Hydrilla, Typha
Protozoan, Copepods Cladoceran
Algae, Diatoms
May 12 29 7.5 3.2 8.9 Chironomous larvae. fish
Eichornia, Hydrilla, Typha
Protozoan, Copepods β
June 8 30 7.4 3.3 6.8 Chironomous larvae. fish, frog
Eichornia, Hydrilla, Vallisnaria, Typha
Protozoan, Copepods β
July 7 27 7.3 3.2 7.4 Chironomous larvae. frog, snail
Eichornia, Hydrilla, Vallisnaria, Typha
β Algae
August 7 25 7.2 3.3 7.7 Chironomous larvae. frog, snail
Eichornia, Hydrilla, Vallisnaria, Typha
Copepod Algae
September 10 24 7.1 3.2 7.1 Frog, fish, snail Scripus, Typha, Eichornia, Hydrilla
Protozoan Diatoms, Algae
October 12 24 7.1 4.0 7.6 Fish, snail Eichornia, Hydrilla, Typha
Protozoan, Copepods Algae
November 12 21 7.1 2.7 7.5 Fish, snail Eichornia, Hydrilla, Typha
β Algae
December 15 19 7.1 2.8 7.5 Fish, snail Eichornia, Hydrilla, Typha
β β
Table 24 : Physico-chemical and Biological Analysis of water samples at Sahaspur (L-2) Locality of Doon Valley during January, 2003 to December, 2003
Macro-organism Micro-organism Month Depth
(cm) Temp. (00C)
pH Free CO2
(mg/l)
DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton
January 12 20 7.0 3.8 5.8 Snail Eichornia Protozoan Algae
February 15 22 6.9 3.7 5.7 Snail Eichornia, Scripus Rotifera, Protozoan Algae
March 13 24 7.2 4.0 5.6 Fish, snail, crab Hydrilla, Vallisnaria Protozoan, Copepods Algae
April 10 25 7.3 4.2 5.5 Fish. snails Eichornia Rotifera, Protozoan Algae
May 8 28 7.5 4.3 5.4 Fish. snails Eichornia Protozoan β
June 7 28 7.4 4.4 5.5 Frog, Tadpod, snail
Eichornia, Ceratophylum
Protozoan β
July 10 26 7.3 4.2 5.7 Frog, snail, tadpol
Pistia, Eichornia Protozoan. copepod Algae
August 11 25 7.1 4.1 6.0 β Eichornia β Algae
September 13 22 7.3 4.3 6.2 Frog, fish, snail Scripus, Typha, Eichornia, Hydrilla
Protozoan Diatoms, Algae
October 12 20 7.2 3.0 5.7 Fish, snail Eichornia, Pistia Copepods, Rotifers Algae
November 13 20 7.0 3.6 5.8 Fish, snail, crab Eichornia, Marsilia Protozoan Algae
December 15 17 7.0 3.7 5.5 Fish, snail Eichornia, Marsilia Protozoan Algae
Table 25 : Physico-chemical and Biological Analysis of water samples at Dudhli (L-3) Locality of Doon Valley during January, 2003 to December, 2003
Macro-organism Micro-organism Month Depth
(cm) Temp. (00C)
pH Free CO2
(mg/l)
DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton
January 16 19 7.8 6.3 7.8 Snail Ceratophyllum, Marsilia
β Algae
February 14 21 7.5 6.1 7.5 Snail Scirpus, Marsilia β β
March 11 23 7.6 6.4 7.6 Fish, snail Scirpus, Marsilia Protozoan β
April 13 24 8.0 6.6 7.3 Fish. snail, crab Marsilia Protozoan β
May 9.0 25 8.2 6.7 7.2 Fish. snail, crab β Protozoan β
June 10 28 8.1 6.8 7.3 Frog, snail β Copepod β
July 10 30 8.0 6.6 7.6 Snail Eichornia β Algae
August 9 27 8.0 6.5 7.8 Snail, Frog Eichornia β Algae
September 11 25 8.0 6.4 7.6 Frog, snail Eichornia β Algae
October 13 24 7.5 6.2 7.6 Fish, snail Eichornia, Protozoan Algae
November 14 21 7.6 6.0 7.3 Snails Eichornia, Marsilia Protozoan Algae
December 13 18 7.6 5.9 7.6 Snails Eichornia, Marsilia Protozoan Algae
Table 26 : Physico-chemical and Biological Analysis of water samples at Lacchiwala (L-4) Locality of Doon Valley during January, 2003 to December, 2003
Macro-organism Micro-organism Month Depth
(cm) Temp. (00C)
pH Free CO2
(mg/l)
DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton
January 14 20 8.0 1.9 7.8 Snail β β Algae
February 15 22 7.8 1.8 7.6 Fish, Snail Eichornia Protozoan Algae
March 13 20 8.1 2.0 7.7 Fish, snail Hydrilla, Eichornia Protozoan, Copepod β
April 11 23 8.4 2.2 7.4 Fish, Chironomous larvae, Snail
β Protozoan, Cladoceran
β
May 9 25 8.6 2.4 7.2 Fish, Snail β Protozoan, Cladoceran
β
June 10 27 8.5 2.6 7.3 Fish, Frog, snail, Chironomous larvae
β Protozoan, Copepod, Cladoceran
Algae
July 12 28 8.4 2.5 7.4 Snail Eichornia, Hydrilla β Algae
August 10 25 8.3 2.6 7.6 Snail Eichornia β Algae
September 13 23 8.2 2.7 7.4 Fish, Frog, snail Eichornia Copepod Algae
October 15 20 8.1 2.2 7.8 Fish, snail Eichornia, Protozoan Algae
November 13 19 7.7 1.7 7.5 Snails β Protozoan Algae
December 14 16 8.0 2.1 7.8 Snails β β Algae
Table 27 : Physico-chemical and Biological Analysis of water samples at Gularghati (L-5) Locality of Doon Valley during January, 2003 to December, 2003
Macro-organism Micro-organism Month Depth
(cm) Temp. (00C)
pH Free CO2
(mg/l)
DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton
January 14 19 8.1 4.6 6.1 Fish, Snail Eichornia, Lemna β β
February 12 21 8.0 4.4 5.8 Fish, Snail, Crab Eichornia, Lemna β Algae
March 15 23 8.2 4.6 6.0 Fish, snail Eichornia, Lemna Protozoan Algae
April 10 24 7.5 4.7 6.0 Fish. snail, Chironomous larvae
Eichornia Protozoan, Copepod Algae
May 8 26 8.5 5.0 5.8 Fish. snail, Chironomous larvae
Eichornia Protozoan, Copepod β
June 11 27 8.0 5.1 5.7 Snail, Chironomous larvae, Crab
Eichornia Protozoan, Copepod, Rotifer
β
July 10 27 7.8 4.9 5.8 Chironomous, frog, snal
Eichornia, Marsilia β β
August 10 26 7.6 4.7 6.2 Frog, Chironomous larvae, Crab
Eichornia β Algae
September 12 25 7.6 4.5 6.0 Snail, Chironomous larvae, Crab
Eichornia Protozoan, Copepod Algae, Diatoms
October 13 23 8.0 4.5 6.1 Fish, snail Eichornia, Protozoan, Copepod Algae
November 13 21 8.0 4.3 5.6 Fish, Snails Eichornia Protozoan, Cladoceran
Algae
December 15 18 8.2 4.5 6.2 Snails β β β
Table 33 : Combined larval-pupal density / dip in experimental / control tanks before implementation of small scale field
trials during May-June (Pre-monsoon) 2005. Experimental days Tank (T1)
(with L. (P.) acuminata)
Tank (T2) (with Thiara tuberculata)
Tank (T3) (with B.
bengalensis)
Tank (T4) (Control)
Average density / dip
1st day 6.8 5.6 7.8 7.2 6.73
3rd day 7.1 7.3 8.2 6.9 7.53
5th day 6.3 7.9 7.2 6.3 7.13
7th day 6.5 6.0 7.3 5.8 6.60
10th day 6.8 6.5 7.2 6.8 6.83 Table 34 : Combined larval-pupal density / dip in experimental / control tanks before implementation of small scale field
trials during September-October (Post-monsoon) 2005. Experimental days Tank (T1)
(with L. (P.) acuminata)
Tank (T2) (with Thiara tuberculata)
Tank (T3) (with B.
bengalensis)
Tank (T4) (Control)
Average density / dip
1st day 7.5 7.2 8.0 7.8 7.56
3rd day 8.0 7.8 8.5 8.1 8.10
5th day 7.8 6.9 7.2 7.5 7.30
7th day 8.1 6.5 8.3 6.7 7.63
10th day 7.0 7.4 7.8 8.0 7.40
Table 35 : Combined larval-pupal density / dip in experimental / control tanks after release of selected species of snails
during May-June (Pre-monsoon) 2005.
Larval-Pupal density/ dip In Exp. Tanks after introducing snailβs species Experiment
No. Days No. of snails released in
each exp. tank
No. of mosq. larvae released
in each exp. tank
T-I Lymnaea (P.)
acuminata
T-II Thiara (M.) tuberculata
T-III Bellamya
bengalensis
In Control Tank (T-IV)
0 5 50 β β β β
1 β β 7.0 6.5 5.7 7.5 Exp. β I
2 β β 6.7 6.2 5.4 7.1
0 5 50 β β β β
1 β β 6.5 5.9 4.8 6.8 Exp. β II
2 β β 6.1 5.5 4.3 6.5
0 5 50 β β β β
1 β β 5.7 4.8 4.0 6.2 Exp. β III
2 β β 5.6 4.3 3.7 5.9
0 5 50 β β β β
1 β β 6.3 5.3 4.5 6.3 Exp. β IV
2 β β 5.9 5.0 4.2 6.0
Average / dip β β β 6.22 5.43 4.57 6.53
Table 36 : Combined larval-pupal density / dip in experimental / control tanks after release of selected species of snails during September-October (Post-monsoon) 2005.
Larval-Pupal density/ dip
In Exp. Tanks after introducing snailβs species Experiment No. Days
No. of snails released in
each exp. tank
No. of mosq. larvae released
in each exp. tank
T-I Lymnaea (P.)
acuminata
T-II Thiara (M.) tuberculata
T-III Bellamya
bengalensis
In Control Tank (T-IV)
0 5 50 β β β β
1 β β 7.7 6.9 6.3 8.1 Exp. β I
2 β β 7.5 6.7 5.9 7.8
0 5 50 β β β β
1 β β 7.2 6.3 5.6 7.6 Exp. β II
2 β β 6.9 6.1 5.2 8.0
0 5 50 β β β β
1 β β 6.2 5.9 5.8 7.2 Exp. β III
2 β β 5.9 5.5 4.5 6.9
0 5 50 β β β β
1 β β 6.8 6.0 5.3 8.1 Exp. β IV
2 β β 6.5 5.9 5.0 7.3
Average / dip β β β 6.83 6.16 5.32 7.62
Table 32 : Pupation of Anopheles stephensi in association with snails species in two different media Exp. No. Media
Ist Exp. No. pupated present
IInd Exp. No. pupated present
IIIrd Exp. No. pupated
present Mortality obtained in Experiment No. Total Percent
1 48 49 48 2 1 2 5 3.3 2 47 49 46 3 1 4 8 5.33 3 44 45 45 6 5 5 16 10.6 4 43 42 43 7 8 7 22 17.3 5 42 40 42 8 10 8 8 26 6
Snailβs water
40 35 38 10 15 12 37 24.6
1 46 47 45 4 3 5 12 8.0 2 38 43 40 5 7 5 17 11.3 3 44 41 46 6 9 4 19 12.6 4 45 52 40 5 8 10 23 15.3 5 40 38 42 10 12 8 30 20.0 6
Tap water
35 32 40 15 18 10 43 28.6
(1) Indoplanorbis exustus (Deshayes, 1884) (4) Thiara (M.) tuberculata (Mueller, 1774) (2) Lymnaea sp. (5) Bellamya bengalensis f. typica (Lamarck, 1882) (3) Lymnaea (P.) acuminata f. chlamys (Benson, 1836) (6) Nil