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Fisheries Research:Monitoring fish movement

in pelagic habitat

Fisheries ResearchMinnesota Department of Natural Resources

http://waterontheweb.org

Andrew J. Carlson andRodney B. Pierce

2011 Minnesota Governor’s Fishing Opener

2:30-3:30 May 13 th 2011

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Pelagic habitat

Open water (>15´ deep)TemperatureDissolved oxygen

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Summer stratification

http://io.uwinnipeg.ca/~simmons/16cm05/1116/50-15-LakeStratification-L4.gif

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Eutrophication

Nutrients enter systemIncrease inphotosynthesis and algaeblooms

Algae dies – oxygen-demanding bacteriadecompose the algaeusing up the oxygen

Nutrients

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Spring

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Summer

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Late summer

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Extreme summer

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Extreme summer

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Fall

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Thermistor chain

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Focal species

Artwork by: Ellen Edmonson and Hugh Chrisp (cisco) and Joe Tomelleri

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Summer squeeze

-10

-9

-8

-7

-6

-5

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-3

-2

-1

006/01 06/21 07/11 07/31 08/20 09/09 09/29 10/19

D e p

t h ( m )

Date

Temp. @ 20˚ C

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Summer squeeze

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006/01 06/21 07/11 07/31 08/20 09/09 09/29 10/19

D e p

t h ( m )

Date

Temp. @ 20˚ C

DO @ 4mg/l

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Fish movementAcoustic tags

Continual movement(location on every fishevery ~1-2 minutes)

TemperatureDepth

Study systems

Little WabanaPillager LakeElk LakeShingobee Lake

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Acoustic tagcoverage

Hydrophone

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16" Cisco

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Why is this important /

what do we do?Standardized assessment techniques

Unique species assemblageChanging habitat conditionsClimatic patterns

Increased levels of eutrophicationMaintaining water quality

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Little WabanaItasca County104 acresMaximum depth: 57 feetLarge northern pikeCisco were historically abundant

1990: 14.5 cisco/net2005: 6.33 cisco/net

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Do large pike usedifferent temperaturesand depths than smallpike?

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Evaluating length regulations:

24-36 inchSlot Limit

30-40 inchSlot Limit

Lake Melissa (24 inch maximum length limit)

0

20

40

Percentageover 24 inches

Percentageover 30 inches

Pre-regulation

Post-regulationExample:

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Summer lakesurvey gill

netting

Sampling pike:

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-2

0

2

4

6

8

10

12

14

16

9/29/2010 0:00 11/18/2010 0:00 1/7/2011 0:00 2/26/2011 0:00 4/17/2011 0:00

19.5 inch Male

D e p

t h ( m )

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9/29/2010 0:00 11/18/2010 0:00 1/7/2011 0:00 2/26/2011 0:00

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0

2

4

6

8

10

12

14

16

D e p

t h ( m )

21.4 inch Female

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Pillager Lake July-September

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05101520253035

Large Pike0 5 10 15 20 25 30 35

Small Pike

1 m

2 m

4 m

3 m

5 m

6 m

Depth

Pillager Lake July September

7 m

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Field sampling

Stationary acousticDO / Temperature profile

Hydrophone downloadQuestions