Lake Erie Fisheries Community Status: 2013

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Presentation transcript:

Lake Erie Fisheries Community Status: 2013 Christopher S. Vandergoot Sandusky Fisheries Research Station Ohio Department of Natural Resources, Division of Wildlife

Lake Erie Fisheries Community Status: 2013 Background Physical Environment Fish Community Sampling Programs Predator Trends Western and Central Basin Eastern Basin Prey Trends Factors Affecting Fish Community

Lake Erie Fisheries Community Status: 2013 West to east gradient in depth, temperature, and productivity West to east gradient in fish community Warm and cool water species dominant in west basin Cool and cold water species dominant in east basin West to east gradient in diversity Nearshore fish community West basin East basin

Lake Erie Fisheries Community Status: 2013 Population Surveys Lakewide harvest assessment programs Lakewide gill net survey Lakewide trawling survey Lakewide acoustic survey Other surveys Lower trophic level Diet assessment

Lake Erie Fisheries Community Status: 2013 Population Surveys Port Stanley, ON Fairport Harbor, OH 57850

Lake Erie Fisheries Community Status 2013 Lower Trophic Level Survey Ontario 20 19 25 15 16 18 1 17 2 13 MI 14 9 PA NY 5 10 6 Added location of station 25 in the Eastern basin in 2009 Stations 5,6 in West Basin are not incorporated into database yet Stations 13,14 in Central Basin were not sampled in 2011 3 11 4 12 OH PA OH 8 7 6

Lake Erie Fisheries Community Status: 2013 Predator Trends (West-central) Declines in walleye abundance 2003 year-class still dominant Highly variable recruitment Recent recruitment mediocre Changes in spatial structure* Growth rates increasing confounded by abundance?

Lake Erie Fisheries Community Status: 2013 Predator Trends (Lakewide) Lakewide declines in yellow perch abundance Majority of population in central basin Highly variable recruitment Movement patterns?

Lake Erie Fisheries Community Status: 2013 Predator Trends (West-central) Declines in smallmouth bass abundance Spring closure enacted 2003 Round goby nest predation Potential cormorant predation Increased abundance in other areas due to warming Lack survey information

Lake Erie Fisheries Community Status: 2013 Predator Trends (East) Population sustained via stocking/ limited natural reproduction Abundance below target levels Sea lamprey abundance on rise Alternative strains evaluated Experimental stocking in WB and CB basins

Lake Erie Fisheries Community Status: 2013 Predator Trends (East) Population sustained via natural reproduction Abundance levels declined recent years Sea lamprey abundance on rise?

Lake Erie Fisheries Community Status: 2013 Nearshore Trends Increases in largemouth bass Increases in sunfish spp. Lake sturgeon abundances Nearshore community study Vegetation= good

Lake Erie Fisheries Community Status 2013 Forage Fish Trends Gradient in forage fish community from west to east Higher diversity in east Cluepids, shiners dominate in western basin Rainbow smelt dominate eastern basin Nearshore fish community? West basin East basin

Lake Erie Fisheries Community Status 2013 Forage Fish Trends Functional forage groups Decrease in clupeids Increase in spiny rayed fish

Lake Erie Fisheries Community Status 2013 Forage Fish Trends Since discovered abundance variable Recent trends declining abundance in all basins

Lake Erie Fisheries Community Status 2013 Lower Trophic Level Trends 2012 Data Dissolved Oxygen (mg/L)

Lake Erie Fisheries Community Status 2013 Factors Effecting Fish Community Hypoxia USGS, EPA & ODNR Harmful Algal Blooms AEL Ohio State

Lake Erie Fisheries Community Status: 2013 Acknowledgements Ontario Ministry of Natural Resources New York State Department of Environmental Conservation Pennsylvania Fish and Boat Commission Ohio Department of Natural Resources Michigan Department of Natural Resources Walleye , Yellow Perch and Forage Task Groups Lake Erie Millennium Network