A Multi-Agency Effort to Address Declines in Yellow Perch Abundance in Lake Michigan David Clapp Michigan Department of Natural Resources and Yellow Perch.

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Presentation transcript:

A Multi-Agency Effort to Address Declines in Yellow Perch Abundance in Lake Michigan David Clapp Michigan Department of Natural Resources and Yellow Perch Task Group, Lake Michigan Technical Committee

Lake Michigan Recreational Yellow Perch Catch (Michigan Waters)

Is there a problem?

Age Distribution of Yellow Perch Catch Age 6 Age 3

Yellow Perch Sampling Fishery Independent versus Dependent Data

What steps have we taken to address perch declines? Step #1 - Formation of Yellow Perch Task Group (1994) Increased sampling coverage Gear standardization

Yellow Perch Task Group Sampling Locations

Summer Trawl and Seine Surveys Catch per unit effort Total length Age Abundance of other species

Gill Net Surveys Catch per unit effort Total length and weight Sex, Fecundity Scales, Otoliths

Lake Michigan Creel Survey Programs (Photo courtesy of The Hunting and Fishing Library)

What steps have we taken to address perch declines? Step #2 - Lakewide public meeting (Yellow Perch Conference - December, Kenosha, Wisconsin) Protect spawning stock Conduct research on declining recruitment Enforce harvest regulations

Regulation changes

Step #3 - Conduct research on declining recruitment Hypotheses Egg stage:  Egg quality and/or egg mortality limits perch Diet:  Inappropriate diet limits larval survival Alewife / predation:  Alewife predation limits recruitment What steps have we taken to address perch declines?

Early Life History (Egg Stage)

Were maternal effects important? Survival (number of individuals) Female Survival: 601 (1) (8) Provided by: Christopher J. Heyer Chesapeake Biological Laboratory

A trade-off exists between yolk volume and larval size Large, old female perch = small yolk volume = large larvae Abundant food, many predators Small, young female perch = large yolk volume = small larvae Scarce food, few predators Provided by: Christopher J. Heyer Chesapeake Biological Laboratory Were maternal effects important?

Food Resources (Diet)

Mean ZP Density in June (No./L) Log (YOY YP CPUE) Yellow Perch Survival versus Zooplankton Density Data provided by John Dettmers, Illinois Natural History Survey)

Alewife (Predation, Competition)

Yellow Perch Year Class Strength versus Alewife Abundance (Data provided by Steve Shroyer, Ball State University)

Other Predators (Photo courtesy of The Hunting and Fishing Library)

Other Predators

YEP(#) = Function (“Cycles” * (x+y+z+…)) What steps have we taken to address perch declines? Step #4 - Implementing Yellow Perch Research in Great Lakes Management

Yellow Perch Abundance Saginaw Bay - Lake Huron

YEP(#) = Function (“Cycles” * (a+b+c+d+…)) d b a c

Recreational Harvest Commercial Harvest

Implementing Perch Research Egg stage, diet, predators

Recreational and Commercial harvest Implementing Perch Research