Age and growth of round gobies in Lake Huron: Implications for food web dynamics

Journal of Great Lakes Research
By: , and 

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Abstract

Although the round goby (Neogobius melanostomus) has become established throughout the 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 gobies at four locations in Lake Huron were assessed via otolith analysis. Total length (TL) of round gobies 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 of round gobies 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 back-calculate total lengths at age, which were then fitted to von Bertalanffy growth models. For each sex, round goby growth showed significant spatial variation among the four locations within Lake Huron. At all four locations in Lake Huron, males grew significantly faster than females and attained a larger asymptotic length than females. Annual mortality rate estimates were high (62 to 85%), based on catch-curve analysis, suggesting that round gobies may be under predatory control in Lake Huron.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Age and growth of round gobies in Lake Huron: Implications for food web dynamics
Series title Journal of Great Lakes Research
DOI 10.1016/j.jglr.2016.08.010
Volume 42
Issue 6
Year Published 2016
Language English
Publisher International Association for Great Lakes Research
Contributing office(s) Great Lakes Science Center
Description 9 p.
First page 1443
Last page 1451
Country United States
State Michigan
Other Geospatial Lake Huron