Age and growth of round gobies in Lake Michigan,with preliminary mortality estimation |
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| Affiliation: | 1. Huazhong Agricultural University, College of Fisheries, Wuhan, Hubei 430070, China;2. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, USA;3. Ontario Ministry of Natural Resources, Aquatic Research and Development Section, 320 Milo Road, Wheatley, ON N0P 2P0, Canada;4. Illinois Natural History Survey, University of Illinois, Lake Michigan Biological Station, 400 17th Street, Zion, IL 60099, USA;1. Beijing Normal University, Beijing, China;2. Chinese Research Academy of Environmental Sciences, Beijing, China;3. Old Dominion University, Norfolk, VA, USA;4. Inner Mongolia Agricultural University, Hohhot, China;1. Department of Biology, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada;2. Ontario Ministry of Natural Resources, Cooperative Freshwater Ecology Unit, Laurentian University, Sudbury, ON P3E 2C6, Canada;3. Department of Biology, Queen''s University, Kingston, ON K7L 3N6, Canada;1. Department of Forestry and Natural Resources, Purdue University, 195 Marsteller St., West Lafayette, IN 47907, USA;2. Illinois-Indiana Sea Grant College Program, Purdue University, 195 Marsteller St., West Lafayette, IN 47907, USA;3. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, 1333 Grandview Ave., Boulder, CO 80309, USA |
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| Abstract: | The round goby (Neogobius melanostomus) is a prevalent invasive species throughout Lake Michigan, as well as other Laurentian Great Lakes, yet little information is available on spatial variation in round goby growth within one body of water. Age and growth of round goby at three areas of Lake Michigan were studied by otolith analysis from a sample of 659 specimens collected from 2008 to 2012. Total length (TL) ranged from 48 to 131 mm for Sturgeon Bay, from 50 to 125 mm for Waukegan, and from 54 to 129 mm for Sleeping Bear Dunes. Ages ranged from 2 to 7 years for Sturgeon Bay, from 2 to 5 years for Waukegan, and from 2 to 6 years for Sleeping Bear Dunes. Area-specific and sex-specific body–otolith relationships were used to back-calculate estimates of total length at age, which were fitted to von Bertalanffy models to estimate growth rates. For both sexes, round gobies at Sleeping Bear Dunes and Waukegan grew significantly faster than those at Sturgeon Bay. However, round goby growth did not significantly differ between Sleeping Bear Dunes and Waukegan for either sex. At all three areas of Lake Michigan, males grew significantly faster than females. Based on catch curve analysis, estimates of annual mortality rates ranged from 0.79 to 0.84. These relatively high mortality rates suggested that round gobies may be under predatory control in Lake Michigan. |
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