Spatial and seasonal comparisons of growth of wild and stocked juvenile lake trout in Lake Champlain |
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| Authors: | Pascal D Wilkins J Ellen Marsden |
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| Affiliation: | 1. Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, United States;2. Lake Erie Management Unit, Fisheries Division, Michigan Department of Natural Resources, Waterford, MI 48327, United States;3. Sandusky Fisheries Research Station, Division of Wildlife, Ohio Department of Natural Resources, Sandusky, OH 44870, United States;4. Fisheries Division, Michigan Department of Natural Resources, Lansing, MI 48909, United States;1. School of Engineering, University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada;2. School of Environmental Science, University of Guelph Ridgetown, 120 Main St E, Ridgetown, ON N0P 2C0, Canada;1. Vermont Cooperative Fish and Wildlife Research Unit, Rubenstein School of Environment and Natural Resources, 81 Carrigan Drive, 302 Aiken Center, University of Vermont, Burlington, VT 05405, USA;2. U. S. Geological Survey, Vermont Cooperative Fish and Wildlife Research Unit, Rubenstein School of Environment and Natural Resources, 81 Carrigan Drive, 302 Aiken Center, University of Vermont, Burlington, VT 05405, USA;3. School of Marine Sciences, 5741 Libby Hall Room 110, University of Maine, Orono, ME 04469, USA;1. Balaton Limnological Institute, Centre for Ecological Research, Klebelsberg Kuno u. 3, 8237 Tihany, Hungary;2. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungária krt. 21, 1143 Budapest, Hungary;1. Environmental Fluid Dynamics Laboratory, Department of Civil Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada;2. Environment and Climate Change Canada, Water Science and Technology, Canada Centre for Inland Waters, Burlington, Ontario L7R 4A6, Canada;1. Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Rd., East Lansing, MI 48824, USA;2. Cooperative Institute for Great Lakes Research, University of Michigan, 4840, USA;3. Great Lakes Laboratory for Fisheries and Aquatic Sciences, Fisheries and Oceans Canada, 867 Lakeshore Rd., Burlington, ON L7S 1A1, Canada;4. Eureka Aquatic Research, LLC, 6245 Wilson Road, Ann Arbor, MI 48108, USA;5. NOAA Great Lakes Environmental Research Laboratory, 4840 S. State Rd., Ann Arbor MI 48108, USA |
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| Abstract: | After 42 years of stocking in Lake Champlain, recruitment of wild juvenile lake trout (Salvelinus namaycush) was first observed in 2015. Abundance of wild lake trout juveniles was spatially heterogeneous. Recruitment of wild fish to age-1 and subsequent survival are likely related to growth including overwinter growth. We hypothesized that growth potential or growth-related mortality of wild and stocked fish may explain spatial differences in abundance. We collected juvenile (age-0 to 3) lake trout by bottom trawling in the central, north, and south Main Lake every 2–4 weeks during the ice-free season, 2015–2018. The percentage of wild juveniles increased from 27.8% of the total catch in 2015 to 65.7% in 2018. Rates of growth in length and change in condition were compared in wild versus stocked lake trout, among sampling areas, and between seasons (sampling season relative to winter). Wild juveniles grew equally or faster in length than stocked juveniles at the same age, but changed more slowly in condition. There was a higher percentage of wild juveniles in the central sampling area than the north and south, but no differences in growth among sampling areas. Wild and stocked fish grew in length over winter, but most cohorts (6 of 7) maintained or increased condition. Results indicate high growth potential of wild juvenile lake trout and progress toward population restoration. |
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| Keywords: | Trawling Recruitment Condition Winter |
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