Lake Michigan Ecosystem Trends and Harvest Data
Lake Michigan
Salmon Update
2022
Jay Wesley
Lake Michigan Basin
Coordinator
Lake Michigan Salmon History
•
https://www.youtube.com/watch?v=wLiG4w
wYM6M
Balanced Food Web
1950’s-1982 Unbalanced
1982 -1990 Unbalanced
1990-2002 Balanced
2003-2022 Sometimes Balanced
And Changing
Lake Michigan Total Phosphorous
Southern Lake Michigan Mussel Trends
(Data Sources: Nalepa et al. 2013; Baldridge
unpub.
)
Water Clarity
Historic Low Prey Biomass
Lake Michigan Sport Harvest
Chinook Salmon Predator Prey Ratio
Great Lakes Record 47.86 lbs
Michigan Chinook Stocking
Next Steps
•
Monitor creel, charter boat, prey, and
predator data.
•
Adjust stocking as prey numbers increase or
decrease
For More Information
For More Information
•
Lake Michigan Fisheries Management Plan
–
https://mdnrlmfmp.wordpress.com/
•
Jay Wesley
–
wesleyj@Michigan.gov
–
616-490-5090
Thank You!
This week the Lake Michigan Committee (comprised of Michigan, Indiana, Illinois, Wisconsin, and 1836 Tribal Nations) announced a stocking plan to help balance predator demand in Lake Michigan with available prey.
The committee has successfully managed previous imbalances by reducing Chinook salmon stocking three times since 1999.
Explore the ecological trends and harvest data in Lake Michigan through images depicting mussel populations, water clarity, fish abundance, historic prey biomass, sport harvest numbers, predator-prey ratios, and salmon stocking figures. Gain insights into the dynamics of the lake's ecosystem and fisheries management over the years.
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Presentation Transcript
Southern Lake Michigan Mussel Trends 60 16-30 m (Quaggas) 30-50 m (Quaggas) 50-90 m (Quaggas) >90 m (Quaggas) % Area by Depth Zone 50 Mean Shell Free Biomass (g AFDW/m2) +/- S.E. 40 30 20 10 0 1998 2003 2008 2013 (Data Sources: Nalepa et al. 2013; Baldridge unpub.)
Comparison of Alewife and Dreissenid (Quagga and Zebra) Mussel Abundance 1200 16 14 1000 Alewife Quagga and Zebra Mussel Biomass (g/m2) 12 Quagga and Zebra Mussel 800 Alewife Biomass (kt) 10 600 8 6 400 4 200 2 0 0 Year
Lake Michigan Sport Harvest 18000 16000 14000 Sport Harvest in pounds (x1,000) 12000 Yellow Perch 10000 Walleye Steelhead 8000 Brown Trout Lake Trout Coho Salmon 6000 Chinook Salmon 4000 2000 0 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Year
Michigan Chinook Stocking Chinook Salmon Stocking in Lake Michigan 3,500,000 3,000,000 2,500,000 Number Stocked 2,000,000 1,500,000 1,000,000 500,000 0
