Physicochemical and microbiological quality of aquaculture ......Waste and sediment formation in the...
Transcript of Physicochemical and microbiological quality of aquaculture ......Waste and sediment formation in the...
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International Journal of Fisheries and Aquatic Studies 2017; 5(5): 428-437
E-ISSN: 2347-5129
P-ISSN: 2394-0506
(ICV-Poland) Impact Value: 5.62 (GIF) Impact Factor: 0.549
IJFAS 2017; 5(5): 428-437
© 2017 IJFAS
www.fisheriesjournal.com
Received: 15-07-2017
Accepted: 16-08-2017
Ginson Joseph
Assistant Professor, St. Albert’s
College, Ernakulam, Kochi,
Kerala, India
Eborlang Kharnaior
Research Scholar, St. Albert’s
College, Ernakulam, Kochi,
Kerala, India
Remya Kumari KR
Senior Research Fellow, Central
Institute of Fisheries
Technology, Matsyapuri, Cochin,
Kerala, India
Correspondence
Ginson Joseph
Assistant Professor, St. Albert’s
College, Ernakulam, Kochi,
Kerala, India
Physicochemical and microbiological quality of
aquaculture farms of Chellanam Panchayath,
Ernakulam
Ginson Joseph, Eborlang Kharnaior and Remya Kumari KR
Abstract Physicochemical and microbiological qualities of pond water in the shrimp culturing farms of Chellanam
Panchayath, Ernakulam were analyzed and compared. Four representative shrimp farms were selected
based on the area and named as farm A, farm B, farm C and farm D, respectively. Physicochemical
parameters such as pH and hardness of the pond water were in the desirable range in all farms; whereas
farm A showed highest dissolved oxygen, iron and phosphate content. Among the farms, farm C revealed
optimum content of alkalinity, nitrite and nitrate. Total plate count in the farm A, B, C and D was 5.5,
4.29, 3.13 and 4.68 log10 cfu ml-1, respectively. Similarly, pathogenic bacteria such as Vibrio cholera, V.
parahaemolyticus, Escherichia coli, Staphylococcus aureus and Salmonella were less than log₁₀ cfu ml-1
in all farms. Coliforms were present in all farms except farm C. One-way analysis of variance (ANOVA)
revealed homogenous content of DO, hardness, iron, alkalinity, ammonia, nitrite, nitrate, total plate count
(TPC) and coliforms in all farms (p>0.05) except farm A and C (p<0.05). This study can be concluded
that lower bacterial load of farm C had better correlation with physicochemical properties of water.
Keywords: total plate count, coliforms, phosphate, hardness, ANOVA
1. Introduction
Aquaculture is a profitable business with better scope for job opportunity and foreign
exchange to the Nation. Increased population and demand for seafood exerted huge fishing
pressure on the natural fishery resources; thus led to decline in the capture fishery at an
alarming rate. Aquaculture is an alternative solution at this crunch; hence this sector boomed
globally including India. Kerala has the tremendous opportunity for the development of
aquaculture sector due to sufficient water resource includes rivers, lakes and reservoirs etc.
However, Varghese (2001) [58] suggested that around 79 % of the brackish water resources in
Kerala remains unused. Even though better scope, this sector also faces several constraints
such as misapplication of husbandry and disease management, collection of seed from wild
and use of fishery resources as feed inputs, habitat alteration, damage to wild fish populations [31], nutrient enrichment, pesticide residue and antibiotic issues, etc. These problems surfaced
many farmers to abandoned aquaculture and changed to other profession.
Moses (1983) [44] suggested that physicochemical and biological parameters of the aquaculture
pond determine water quality, which directly or indirectly influences the productivity of the
pond. Waste and sediment formation in the aquaculture farm was mainly due to fish excreta’s
and dissolved metabolic wastes [9]. Cho & Bureau (1997) [20] suggested that composition of
feed such as protein, lipid and phosphorous content has significant role for the waste
production in the farm. Decomposition of solid waste in the water column release phosphorus [38]. Literature revealed that approximately 3 to 10 kg of phosphorus and 39 to 55 kg of
nitrogen are liberated to the environment for every metric ton of fish production (Bureau et al.,
2003) [17]. Respiration of fish reduces dissolved oxygen concentration in the aquaculture farm.
However, this fluctuation can be managed by adequate water exchange [59]. All living
organisms have a tolerable limit of each water quality parameter in which they perform
optimally. Sharp drop or an increase within these limits can cause an adverse effect on their
metabolic functions. Moreover, aquatic life becomes stressful when the physicochemical and
biological parameters have been altered, which vulnerable the organism for infection.
Decaying of feed, faeces and urinary excretions of fish releases dissolved carbon, nitrogen and
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International Journal of Fisheries and Aquatic Studies
phosphorus to the water (Bureau & Cho, 1999) [16], this
stimulates pelagic bacterial populations (Carr & Goulder,
1990) [18] moreover, salinity, temperature, pH and dissolved
oxygen also plays a significant role for the bacterial load in an
aquatic system. Rheinheimer (1991) [48] reported that
physicochemical properties of water source greatly influence
the bacterial population. It has been observed that good
husbandry practices reduce the incidence of pathogenic
bacteria such as E. coli and Staphylococcus. Anita et al.
(2013) [4] studied the relationship between the water quality
and fish production and the authors suggested that farming
should be carried out in an environmentally sustainable
manner to produce better quality and safety aquatic products
which accept socially. Amagliani et al. (2012) [30] suggested
that majority of outbreaks of food-related illness are due to
the action of pathogenic bacteria than chemical or physical
contaminants. There was a lack of research on the aquaculture
farms of Kerala. Hence this study was designed to evaluate
the physicochemical and microbiological qualities of the
water of aquaculture farms of Ernakulam.
2. Materials and Methods
2.1 Physicochemical analysis
Four representative shrimp culture farms from Chellanam
Panchayath, Ernakulam were selected based on the area and
named as farm A, farm B, farm C and farm D. The
physicochemical parameters such as dissolved oxygen,
phosphate, iron, total hardness, pH, alkalinity, nitrate, nitrite
and ammonia of each pond were analyzed as per APHA
(2012) [7].
2.2 Microbiological analysis
Pond water of farm A, B, C, and D was collected in a
sterilized glass bottle during the early hours of the day and
immediately brought to the laboratory for microbiological
analysis. The following microbiological parameters viz: total
plate count, Coliforms, E. coli, Staphylococcus aureus, Vibrio
parahaemolyticus, V. cholera and Salmonella were analyzed
as per APHA (2012) [7].
2.3 Statistical analysis
One-way analysis of variance (ANOVA) was carried out to
find the level of significance of physicochemical and
microbiological parameters among the farms. Statistical
analysis software (SAS) version 9.3 (SAS Institute, 2012) was
used for statistical analysis.
3. Results and Discussions
3.1 Dissolved oxygen (DO)
Dissolved oxygen content indicates the level of productivity
in an aquaculture pond. Several factors such as density of fish,
turbidity, organic matters and wind velocity influence the DO
content of an aquaculture pond (Boyd et al., 1978) [14]. There
is a directly proportional relationship with body mass of an
aquatic organism and DO consumption [37]. According to
Banerjea (1967) [8], DO content above 5 ppm is ideal for
better productivity; however, its depletion causes poor
feeding, starvation, reduced growth rate, high mortality and
alteration in the behavior and physiology of an aquatic
organism[10]. Bhatnagar et al., (2004) [11] suggested that 1-3
ppm of DO has sublethal effect on growth and feed
utilization. Optimum level of DO for the shrimp farms is 5-7
ppm [6]. In the present study DO content of farms A, B, C and
D showed 3, 5, 7 and 6.4 ppm, respectively (Figure 1). It was
found that DO content in all farms was in the acceptable
range except farm A. Statistical analysis revealed there was
no significant difference of DO content among the farms
(p>0.05) except farm A and C (p<0.05). According to Saloom
& Duncan (2005) [52], DO content should be maintained at 5
ppm for better production in the tropical aquaculture ponds.
Fig 1: Levels of dissolved oxygen content in the aquaculture farms
3.2 pH of the farms
pH indicates acid base balance of water and it is an essential
factor for the determination of growth and survival of fishes
in the culture pond. According to Ekubo & Abowei (2011) [27]
the aquatic organisms were vulnerable to stress and shows
retarded growth at low (4-6.5) and high range of pH (9-11);
whereas, pH less than 4 and greater than 11 causes mortality
to the entire stoke in the pond. According to Santhosh &
Singh (2007) [53], suitable range of pH for aquaculture is 6.7 to
9.5, whereas 7.5 to 8.5 to be optimum for fish culture. Anita
& Pooja (2013) [5] suggested that pH of aquaculture pond
ranging from 7 to 8.5 is ideal for biological productivity. This
is in agreement with (Anon 2006) [6]. In the present study, pH
of all farms is under desirable conditions and showed a value
of 8, 8.3, 7.5 and 7.8, respectively in the farm A, B, C and D
(Figure 2). Result is in agreement with Kamal et al. (2007) [35].
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International Journal of Fisheries and Aquatic Studies
pH was significantly different in farm B and C, farm A and C,
and farm B and D (p<0.05); whereas homogenous pH content
was observed in farm D and C, farm B and A, and farm A and
D (p>0.05).
Fig 2: Levels of pH in the aquaculture farms
3.3 Total hardness
Hardness indicates the concentration of alkaline earth
elements especially calcium, magnesium, iron, manganese,
strontium, zinc and hydrogen ions and it highly fluctuated
based on the level of pH in the water. As per Bhatnagar et al.
(2004) [11], hardness content less than 20 ppm and more than
300 ppm causes stress and lethal to aquatic organisms,
whereas 75-150 ppm is considered as optimum for
aquaculture. This is in well agreement with Santhosh & Singh
(2007) [53]. In the present study, hardness content in all farms
were in the acceptable range and showed a value of 135, 150,
170 and 145 ppm, respectively in Farm A, B, C and D (Figure
3). Among the farms, least hardness content was noticed in
farm A, whereas farm C showed highest hardness content.
One-way ANOVA revealed that there was no significant
difference of hardness content among the farms (p>0.05)
except farm A and C (p<0.05).
Fig 3: Levels of hardness in the aquaculture farms
3.4 Phosphate
Phosphate even at low concentration is essential for the
production of planktons. According to Bhatnagar et al. (2004) [11], an optimum and productive level of phosphate in the
aquaculture pond is in the range of 0.05 to 0.07 ppm; whereas
1 ppm is also good for the production of plankton. This is in
well agreement with Stone & Thormforde (2004) [55].
According to Bhatnagar & Devi (2013) [10], acceptable range
of phosphorous in the aquaculture pond is 0.03 to 2 ppm, and
desirable range is 0.01 to 3 ppm and cause stress to aquatic
organisms at more than 3 ppm concentration. According to
Anon (2006) [6], 0.1 to 0.2 ppm dissolved inorganic phosphate
is ideal for shrimp farm. Phosphate content in farm A, B, C
and D was 0.32, 0.18, 0.23 and 0.13 ppm, respectively (Figure
4). Among the farms, higher phosphate content was noticed in
farm A, whereas least concentration was observed in farm D;
similarly, phosphate content was optimum in farm B and D.
One-way ANOVA revealed that there was no significant
difference of phosphate content among the farms (p>0.05)
except farm A and D (p<0.05).
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International Journal of Fisheries and Aquatic Studies
Fig 4: Levels of phosphate in the aquaculture farms
3.5 Iron
Iron is mainly seen in ground water and it acts like a catalyst
to promote dissociation of oxygen molecules in water and
liberate free radicals [23]. Iron combines with oxygen to
produce orange or rusty colour in the pond water. According
to Dryden-Aqua (1997) [26], an iron content of 0.1 ppm in
clean water causes gill damage to the fishes. Farm A, B, C
and D showed an iron content of 0.08, 0.05, 0.02 and 0.025
ppm, respectively (Figure 5). Highest content of iron was
noticed in farm A, whereas farm C showed least content.
Recommended level of iron in an aquaculture pond is 0.3 ppm [33]. Iron content in all farms was in the acceptable ranges.
Statistical analysis revealed there was no significant
difference of iron content among the farms (p>0.05) except
farm A and C (p<0.05).
The level of iron above 0.1 mg/L especially in very clean
water with low organic concentration could damage the gill
(Dryden Aqua 1997).
Fig 5: Levels of iron content in the aquaculture farms
3.6 Alkalinity
Alkalinity indicates the concentration of bases such as
carbonates, bicarbonates, hydroxides, phosphates, borates,
dissolved calcium, magnesium, and other compounds in the
aquaculture pond and it can be adjusted by applying lime.
There is a directly proportional relationship with alkalinity
and productivity in the farms. Boyd & Lichtkoppler (1979) [13]
suggested that alkalinity ranging from 20 to 150 ppm ideal for
the production of planktons. According to Bhatnagar & Devi
(2013) [10], acceptable range of alkalinity in the aquaculture
pond is 50 to 200 ppm, and desirable range is 25 to
100 ppm and cause stress at more than 300 ppm or less
than 20 ppm concentration, which is in agreement with
Guidelines for Water Quality Management for fish culture at
Tripura. Farm A, B, C and D showed an alkalinity content of
184, 195, 215 and 205 ppm, respectively (Figure 6).
Alkalinity of 200 ppm is optimum for a scientific shrimp
culture system [6]. Farm A and B were in the acceptable range,
whereas farm C and D were exceeded this range. One-way
ANOVA revealed that there was no significant difference of
alkalinity content among the farms (p>0.05) except farm A
and C (p<0.05).
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International Journal of Fisheries and Aquatic Studies
Fig 6: Levels of alkalinity content in the aquaculture farms
3.7 Ammonia
Ammonia is a primary nitrogenous by-product liberate from
the decomposition of excess feed, faeces, dead planktons and
other organic matters by heterotrophic bacteria [60]. Pettersson
(1988) [46] suggested that time and temperature are the two
major factor which accelerate the formation of ammonia in
the aquatic system. Unionized ammonia is highly toxic than
ionized form. As per EIFAC (1973) [29], 0.6 to 2 ppm of
unionized ammonia is lethal to culture species. Santhosh &
Singh (2007) [53] recommended a level of 0.1 ppm of
ammonia is ideal for aquatic organism. However, according to
Anon (2006) [6] recommended level of ammonia in a shrimp
culture system should be less than 0.01 ppm. Level of
ammonia was in acceptable in farm C; whereas farm A, B and
D showed a value of 0.05, 0.02 and 0.03 ppm, respectively
(Figure 6.1). One-way ANOVA revealed a homogenous
ammonia content in all farms (p>0.05) except farm A and C
(p<0.05).
Fig 6.1: Levels of ammonia in the aquaculture farms
3.8 Nitrite
Nitrite was an intermediate product of the aerobic nitrification
process. Nitrite was highly toxic to aquatic organisms hence;
its content should be minimum in the aquatic system for better
survival of aquatic organisms. Stone & Thomforde (2004) [55]
reported that a nitrite content ranging from 0-1 ppm is
desirable in fish culture; however, a range below 4 ppm is
also still acceptable. OATA (2008) [45], suggested the
acceptable level of nitrite in freshwater and marine water is
0.2 and 0.125, respectively. Similarly, Bhatnagar et al. (2004) [11] suggested that 0.02-1.0 ppm is lethal to many fish
species, more than 1.0 ppm is lethal for many warm
water fishes and less than 0.02 ppm is acceptable for
aquaculture. According to Anon (2006) [6] recommended
level of nitrite in a shrimp culture system should be less
than 0.01 ppm. In the present study nitrite content in
farm A, B, C and D was 0.04, 0.02, 0.009 and 0.03,
respectively (Figure 7). Among the farms, acceptable range
and less nitrite content was noticed in Farm C. One-way
ANOVA revealed that there was no significant difference of
nitrite content among the farms (p>0.05) except farm A and C
(p<0.05).
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International Journal of Fisheries and Aquatic Studies
Fig 7: Levels of nitrite content in the aquaculture farms
3.9 Nitrate
Nitrate even at higher concentration is harmless to aquatic
animals, which is produced the combining of nitrite and
oxygen by the action of autotrophic Nitrobacter bacteria.
Stone & Thomforde (2004) [55] suggested that higher content
of nitrate is hazardous to fishes. Santhosh & Singh (2007) [53]
reported the favorable range of nitrate in aquaculture pond is
0.1 to 4.0 ppm, which is in well agreement with the
guidelines of Water Quality Management for fish culture
in Tripura. However, as per Anon (2006) [6], nitrate
content should be less than 0.03 ppm for an ideal
shrimp farming system. In the present study the nitrate
content in Farm A, B, C and D was found to be 0.07, 0.04,
0.02 and 0.06 ppm, respectively (Figure 7.1). It was clearly
evident that nitrate content of Farm C was in the acceptable
range than other farms. One-way ANOVA revealed
homogenous nitrate content in all farms (p>0.05) except farm
A and C (p<0.05).
Fig 7.1: Levels of nitrate content in the aquaculture farms
3.10 Total plate count (TPC)
Water quality significantly influences the bacterial load of an
aquaculture pond and the microbial load of an aquatic
organism [49]. Total plate count in the water of farm A, B, C
and D was 5.5, 4.29, 3.13 and 4.68 log10 cfu ml-1, respectively
(Figure 8). The present result is in agreement with Bisht et al.
(2012) [12]. Lekshmy et al. (2014) [41] recorded 6.7 log10 cfu
ml-1 of total plate count in the extensive Penaeus monodon
culture systems of southwest coast of Kerala. Yousuf et al.
(2008) [61] reported total bacterial count in the range of 2.31 to
5.65 log10 cfu ml-1 in P. monodon culture ponds of
Bangladesh. Highest total viable count was noticed in Farm
A, whereas least count was observed in Farm C. According to
ICMSF (1986) [34], TPC level of about 10⁷ is the maximum
limit under which a product is considered to be good.
However, Lakhmanan et al. (1984) [39], reported TPC above
105 is considered as poor quality. Total plate count of all
farms under the limit of desirable range. One-way ANOVA
revealed that there was no significant difference of TPC
among the farms (p>0.05) except farm A and C (p<0.05).
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International Journal of Fisheries and Aquatic Studies
Fig 8: Levels of total plate count in the aquaculture farms
3.11 Vibrio spp.
Human pathogenic species of Vibrio in an aquatic system
indicates the public health safety of water [22]. According to
Ruangpan & Tubakaew (1994) [51] Vibrio spp. is an
autochthonous flora in the coastal ecosystem, which was
found in abundance in the coastal waters of Cochin [2].
Sindermann (1979) [54] suggested that Vibrios are the major
disease causing bacteria normally found in the environment.
Among the Vibrios, Vibrio cholera and V. parahaemolyticus
were the major pathogen which causing diseases to the
aquatic organism by disintegrate the water quality [50].
Karunasagar et al. (1996) [36] pointed out that V.
parahaemolyticus act as a secondary pathogen in the viral
disease outbreak. According to ICMF (1978) [34], reports of V.
parahaemolyticus in the water bodies vary from 35 to 55%.
As per the Centre for Food Safety, satisfactory levels of V.
parahaemolyticus should be <20 cfu/ml (g), however
borderline value can range from 20 ≤10³ cfu ml-1 (g -1). In the
present study V. cholera and V. parahaemolyticus were less
than log₁₀ cfu ml-1 in all farms.
3.12 Escherichia coli
Occurrence of E. coli indicates faecal contamination of warm
blooded animals [43] and it also poses public health hazard [47].
In an aquaculture system, the source of E. coli is mainly
through terrestrial water bodies in which contamination has
been taken place. Budisusilowati & Haryani (1995) [15]
isolated E. coli from the shrimp and sediment of the brackish
water farms of Indonesia and reported a count less than 3 cfu
g-1. Chandran et al. (2009) [19] reported occurrence of E. coli
in Vembanadu lake at Kumarakom region. In the present
study E. coli was less than log₁₀ cfu ml-1 in all farms.
3.13 Staphylococcus aureus
S. aureus is a pathogenic bacterium which cause food
poisoning that lead to public health problem associated with
fish and fishery products [32]. Humans are the main source of
S. aureus and get contaminated through the environment due
to improper hygienic and sanitary conditions. A count of 2.30
log₁₀ cfu g-1 of S. aureus was isolated from the Clarius
gariepinus in selected waste water stabilization ponds at
Kilimanjaro, Tanzania [1]. In the present study S. aureus was
less than log₁₀ cfu ml-1 in all farms.
3.14 Salmonella
Salmonella is very harmful to humans, and its occurrence in
raw or cooked product is considered to be an adulterant [57].
Lunestad et al. (2007) [42] suggested that homemade feed is
one of the major source for the contamination of Salmonella
spp. which can be transmitted to cultured species and finally
to consumers. In an aquaculture system, Salmonella tends to
form biofilms on both inert and organic surfaces, which
provide better shelter against environmental stresses [25].
Presence of Salmonella should be absent for a good
aquaculture system. In the present study Salmonella was less
than log₁₀ cfu ml-1 in all farms. Dalsgaard et al. (1995) [24]
reported that Salmonella does not appear to constitute a
normal part of the bacterial flora in a tropical brackish water
environment. Leangphibul et al. (1986) [40] also reported less
occurrence of Salmonella in water and sediments of shrimp
farms in Thailand.
3.15 Coliforms
Coliforms are not pathogenic to human, but their presence
reveals contamination and the occurrence of several
pathogenic floras in the pond (Cohen & Shuval, 1973) [21].
However, Ampofo & Clerk (2010) [3] suggested that
consumption of faecal coliform contaminated aquatic
organism can cause dangerous disease to humans. Sugumar et
al. (2001) [56] noticed increased coliform count towards the
end of the culture in a shrimp farming system. Count of
coliform in farms A, B, C and D were 3.04, 2.69, 1.17 and 2.3
MPN ml-1, respectively (Figure 9). According to EPA (2003) [28], the permissive level for coliforms should be 0 MPN
100ml-1. Chandran et al. (2009) [19] found that the presence of
coliform was higher in sediment than in overlying water of
Vembanadu lake at Kumarakom region. One-way ANOVA
revealed that there was no significant difference of coliforms
among the farms (p>0.05) except farm A and C (p<0.05).
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International Journal of Fisheries and Aquatic Studies
Fig 9: Levels of coliforms in the aquaculture farms
4. Conclusion
The present study was under taken to determine the level of
water quality of farm A, B, C & D in Ernakulam with
reference to physicochemical and microbiological parameters.
Among the farms, farm ‘A’ revealed better physicochemical
properties such as pH, phosphate, iron, nitrite and nitrate;
similarly microbiological parameters viz: TPC and Coliforms.
Pathogenic bacteria such as V. cholera, V. parahaemolyticus,
E. coli, S. aureus and Salmonella were less than log₁₀ cfu ml-1
in all farms. Statistical analysis revealed a homogenous value
for DO, hardness, iron, alkalinity, ammonia, nitrite, nitrate,
TPC and coliforms in all farms (p>0.05) except farm A and C
(p<0.05). In farm C, alkalinity, nitrite and nitrate content were
in acceptable range and showed better physicochemical and
microbiological parameters compared to other farms.
5. Acknowledgements
The authors acknowledge the financial assistance provided by
the University Grant Commission (UGC), Govt. of India
(Grant No: 1810-MRP/14-15/KLMG007/UGC-SWRO), for
carrying out this work.
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