Status of a stocked Atlantic salmon population in Lake Huron |
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| Affiliation: | 1. Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, United States;2. Department of Agricultural, Food, and Resource Economics, Michigan State University, East Lansing, MI 48824, United States;3. Fisheries Division, Michigan Department of Natural Resources, Gaylord, MI 49735, United States;4. Fisheries Division, Michigan Department of Natural Resources, Oden State Fish Hatchery, Alanson, MI 49706, United States;1. Department of Biology, University of Minnesota, Duluth Campus, 207 Swenson Science Building, 1035 Kirby Dr, Duluth, MN 55812, United States;2. Wisconsin Department of Natural Resources, Bureau of Fisheries Management, La Crosse, WI 54603, United States;3. The Brule River Sportsmen''s Club, 6460 E. County Hwy B, South Range, WI 54874, United States;4. US Fish and Wildlife Service, Lodi Fish and Wildlife Office, 850 South Guild Ave. Suite 105, Lodi, CA 95240, United States;1. Department of Geological Sciences & Engineering, Queen’s University, Kingston, Ontario, Canada;2. Water Quality Monitoring and Surveillance Division, Environment and Climate Change Canada, Burlington, Ontario, Canada;1. Ecological Modelling Laboratory, Department of Physical and Environmental Sciences, University of Toronto, Toronto, Ontario M1C 1A4, Canada;2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;3. Fisheries and Oceans, Burlington, Ontario L7S 1A1, Canada;4. Ontario Ministry of Natural Resources and Forestry, Glenora Fisheries Station, Picton, ON K0K 2T0, Canada;1. Faculty of Science, Ontario Tech University, 2000 Simcoe Street North, Oshawa, Ontario L1H 0G5, Canada;2. Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada;3. Toronto and Region Conservation Authority, 101 Exchange Avenue, Vaughan, Ontario L4K 5R6, Canada |
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| Abstract: | In 2011, the Michigan Department of Natural Resources (MDNR) expanded stocking of Atlantic salmon (Salmo salar) in Lake Huron to enhance fishing opportunities following Chinook salmon (Oncorhynchus tshawytscha) abundance declines. Currently, little is known about the population produced from this stocking. We fit an assessment model to harvest data from Michigan jurisdictional waters to estimate Atlantic salmon population dynamics and abundance. Because of potential biases in MDNR creel survey harvest estimates, a survey was e-mailed to online purchasers of a 2019 Michigan fishing license asking about where and when Atlantic salmon were harvested to correct creel harvest estimates. Anglers were also asked about catch-and-release angling and tested on their ability to identify Lake Huron salmonids. Creel harvest estimates overlapped spatially and temporally with 42% of survey reported Atlantic salmon harvest. After correcting creel harvest estimates, total abundance of Atlantic salmon in 2019 was estimated at approximately 392,000 fish with a peak abundance of approximately 406,000 fish. Anglers released 27% of caught fish and correctly identified Atlantic salmon 28% of the time. To assess the occurrence of food resource competition, differences in condition (i.e., expected weight at length) were evaluated. Condition was higher in later years than in earlier years despite abundance increases. Our results suggested that past stocking established a population of approximately 400,000 Atlantic salmon with evidence suggesting that fish were finding sufficient food resources. Future Atlantic salmon management efforts may be improved by quantifying post-stocking survival rates and other sources (e.g., charter, Canadian) of harvest. |
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| Keywords: | Lake Huron Atlantic salmon Statistical catch at age Stock assessment Condition |
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