Dave Bartz, WI DNR Fisheries Biologist, Green Lake Fish Survey 2011

Big Green Lake Fish Survey - 2011

Objectives
Sample Coolwater Fisheries
Spring Fyke netting and Electrofishing
Walleye, Northern Pike, Bass sp. and panfish
Catch Rates/Population Density
Population Age Structure and Growth Rates
Fall Electrofishing
Walleye Recruitment
Sample Coldwater Fisheries
Fall Gill Netting, Fyke Netting and Shocking
Lake Trout, Brown Trout and Cisco
Catch Rates/Population Density
Carp?

Fyke Net Lead

Set Fyke Net

Set Net ready to run

Sex determination on Northern Pike

All fish sexed and measured to nearest tenth of an inch Weights and age samples taken on subsample

Green Lake Musky 2500 stocked annually since 2004

Black Crappie

Boomshocker

Age Structures Dorsal Spines Scales

Walleye - 94 survey
Low density population
Recruitment problems
habitat loss
predation/competition
cool water temperatures
Increased interest in stocking
Concern over genetics

Mixing OTC Solution for marking fry

Gill Netting
Net locations are historical sites
Target species are Lake Trout and Cisco
Catch rate comparisons
Size structure comparisons
New aging techniques

Stocking 1980-Present
Quotas increased 1980-82
Increased recruitment by 1984
Disease problems 1987-89 - No stocking
Stocking quotas raised to 50,000 in 1991
Presently quotas back to 25,000
Average 30,736 since 1992
VHS concerns have affected availability

Seeforellen Brown Trout

Carp
First planted in 1882
Full scale removal efforts by 1930’s
Carp trap at County A in 1950’s-60’s
State rough fish crews 1950’s-60’s
Commercial removal during the 80’s
Carp trap at County K – 1992 replaced by barrier in 2009
Commercial contracts

Summary
Fish Populations are constantly changing
What can be done to help improve?
Habitat Protection and Restoration
Water Quality Issues
Aquatic Invasives
Plants
Animals
Disease - VHS?

Goal is to Improve Fish Populations and Fishing

Thank You Questions ?

Dave Bartz, WI DNR Fisheries Biologist, Green Lake Fish Survey 2011

by greenlakeassociation on Jul 29, 2011

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Dave Bartz, WI DNR Fisheries Biologist, Green Lake Fish Survey 2011 — Presentation Transcript