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Tuesday, January 26 • 11:40am - 12:00pm
Age and Growth of Round Gobies In Lake Huron: Implications For Food Web Dynamics

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AUTHORS: You J. Duan, Huazhong Agricultural University; Charles P. Madenjian*, USGS Great Lakes Science Center; Cong X. Xie, Huazhong Agricultural University; Jame S. Diana, University of Michigan; Timothy P. O'Brien, USGS Great Lakes Science Center; Ying M. Zhao, Ontario Ministry of Natural Resources; Ji X. He, Michigan Department of Natural Resources; Steven A. Farha, USGS Great Lakes Science Center; Bin Huo, Huazhong Agricultural University

ABSTRACT: Although the round goby Neogobius melanostomus has become established throughout Lake Huron, as well as other Laurentian Great Lakes, information is scarce on spatial variation in round goby growth between and within lakes. Based on a sample of 754 specimens captured in 2014, age, growth and mortality of round goby at four areas of Lake Huron were assessed via otolith analysis. Total length (TL) ranged from 44 to 111 mm for Saginaw Bay, from 45 to 115 mm for Rockport, from 50 to 123 mm for Hammond Bay, and from 51 to 118 mm for Thunder Bay. Estimated ages ranged from 2 to 5 years for Saginaw Bay, from 2 to 6 years for Rockport, and from 2 to 7 years for Hammond Bay and Thunder Bay. Sex-specific body-otolith relationships were used to reconstruct the history of total lengths at age, which were then fitted to von Bertalanffy models. For each sex, round goby growth showed significant spatial variation among the four areas within Lake Huron. Moreover, round gobies grew significantly slower in Lake Huron than in Lake Michigan. At all four areas of Lake Huron, males grew significantly faster than females and attained a larger asymptotic length than females. Annual mortality rate estimates, based on catch curve analysis, suggested that round gobies may be under predatory control throughout most of Lake Huron.

Tuesday January 26, 2016 11:40am - 12:00pm EST
Emerald A