Meeting 9-4-2015 Aaron J. Cole WDNR Senior Fisheries Biologist - - PowerPoint PPT Presentation

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Meeting 9-4-2015 Aaron J. Cole WDNR Senior Fisheries Biologist - - PowerPoint PPT Presentation

Nov 14, 2023 469 likes •698 views

Pipe Lake Meeting 9-4-2015 Aaron J. Cole WDNR Senior Fisheries Biologist Barron & Polk counties Aaron.Cole@Wisconsin.gov 715-637-6864 FISHERIES MANAGEMENT . we make fishing better Sampling Fyke Netting (Apr. 4 to Apr.

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Pipe Lake Meeting

9-4-2015

Aaron J. Cole WDNR Senior Fisheries Biologist Barron & Polk counties Aaron.Cole@Wisconsin.gov 715-637-6864

FISHERIES MANAGEMENT……….…we make fishing better

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Sampling

  • Fyke Netting (Apr. 4 to Apr. 10, 2015)

– Walleye (marking), northern pike

  • Early spring shocking (Apr. 10, 2012)

– Walleye (recapture)

  • Bass daytime shocking (marking for PE) (Apr. 28-30, May 4, 26-

27, 2015) – Largemouth bass and smallmouth bass

  • Late spring shocking (June 1-2, 2015)

– Bass (recapture), bluegill, black crappie

  • Fall shocking (in a couple weeks)

– Walleye recruitment (Age-0 and Age-1 walleye) – Largemouth bass

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Walleye size(lakes combined)

N = 200

5 10 15 20 25 30 8 10 12 14 16 18 20 22 24 26 28

Frequency Length (in)

Unknown Male Female

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0.0 0.5 1.0 1.5 2.0 2.5 3.0 1985 1990 1995 2000 2005 2010 2015 2020

Adult density (fish/acre) Year

Adult (≥15 in) Walleye population estimates

Density (fish/acre) Lakes combined: 0.8 Pipe Lake: 0.7

  • N. Pipe Lake: 1.4
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Northern pike size structure

1 2 3 4 5 6 7 8 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

Frequency Length (in)

Unknown Male Female

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Bluegill size structure

20 40 60 80 100 120 3 4 5 6 7 8

Frequency

Length (in) N=333 Pipe Lake: 186 fish/mile North Pipe: 147 fish/mile

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Largemouth Bass size structure (marking)

20 40 60 80 100 120 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Frequency Length (in)

N=729

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Adult (≥8 in) largemouth bass population estimates

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 2002 2006 2010 2014

Density (fish/acre) Year

2004: 2015: 7.7 fish/acre 10.1 fish/acre

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Catch rates of ≥8” largemouth bass in fall surveys

2 4 6 8 10 12 2007 2008 2009 2010 2011 2013 2014

Fish / mile Year

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Early Conclusions

  • Good water quality but low fertility
  • Low density walleye population (0.8

fish/ac), but typical for Polk County lakes

  • Maintain 18” walleye length limit and 3 fish

daily bag limit

  • Continue alternate year large fingerling

walleye stockings-10 fish/acre

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Early Conclusions

  • Has maintained a high density largemouth

bass population

  • Increased harvest of 9-14” largemouth

bass will improve size structure

  • Will continue annual fall shocking surveys

– Assess bass and walleye

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Black Crappie Sarcoma

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Barron & Polk distribution

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What we know

  • Know very little about BLC sarcoma…
  • Results open raised sores on the skin
  • Diagnosed as small round cell tumor

– sarcoma (malignant tumor of fish)

  • We think a virus may trigger the tumor
  • Currently advise not to eat

– DISCARD infected fish!

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Current testing

  • Picture of fish, blood, skin, muscle, gill, heart,

kidney, spleen, liver, lesion

– Histology (the study of microscopic anatomy of cells)

  • Maine

– Electron microscopy (EM; used to visualize the virus)

  • Madison

– Virology (study of viruses)

  • La Crosse

– Next generation sequencing (used to identify virus)

  • Florida
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Questions?

Aaron J. Cole WDNR Senior Fisheries Biologist Barron & Polk counties Aaron.Cole@Wisconsin.gov 715-637-6864

FISHERIES MANAGEMENT……….…we make fishing better