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Tuesday, January 29 • 6:00pm - 9:00pm
(STUDENT RESEARCH POSTER 1) Diet and Growth Rates of the Tubenose Goby (Proterorhinus Semilunaris)

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AUTHORS: Bradley Dawson, University of Minnesota Duluth

ABSTRACT: Invasive fish species have caused numerous detrimental effects in the Great Lakes region. Basic life history knowledge of a species is necessary to accurately determine if the species is truly ?invasive?. One species, the tubenose goby (Proterorhinus semilunaris), is thought to have arrived in the Great Lakes in the 1990s via ballast water in trans-oceanic ships. This species has been poorly studied within North America, making it difficult to predict its effects on native ecosystems._x000D_
This study seeks to inform on the potential of the tubenose goby as a true invasive species within the context of the Great Lakes. Growth rates and seasonal diet patterns were examined from a population within the St. Louis River Estuary near Duluth, Minnesota, a tributary to Lake Superior. Growth rates and dietary breadth have ramifications for survival, competitiveness, and dispersal ability of fish species, influencing its potential success as an invasive species. Gobies were sampled from shallow vegetated habitat via a seine net during summer and fall periods. I removed otoliths and aged fish on daily and annual increments for growth modelling; furthermore, stomach contents were identified and weighed to provide measures of fitness and dietary breadth between seasons (fall vs. summer) and between several locations within the estuary. _x000D_
Preliminary results suggest a relatively low dietary breadth that is heavily dependent on Crustacea, regardless of location or season. Developing growth analysis indicates that tubenose gobies may be fast-growing and short-lived, indicating an r-selected life history.

Tuesday January 29, 2019 6:00pm - 9:00pm EST

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