2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

5/24/2018 | 2:45 PM - 3:00 PM | SPATIAL AND TEMPORAL TRENDS OF PREY FISH GROWTH AND CONDITION IN LAKE HURON | 420 B

SPATIAL AND TEMPORAL TRENDS OF PREY FISH GROWTH AND CONDITION IN LAKE HURON

In the 1930s, alewife Alosa pseudoharengus and rainbow smelt Osmerus mordax became important components of the Lake Huron prey fish community. The expansion of alewife resulted in negative impacts to native prey fish species and led to major changes in food webs. Thus, understanding alewife and rainbow smelt life history traits are necessary to manage the fish community. Our objective is to describe spatial and temporal trends in growth and condition of alewife and rainbow smelt in the main basin of Lake Huron. We use time-varying hierarchical models to describe changes in mean length-at-age and condition of both species. Alewife length-at-age exhibited a trend towards smaller sizes from 1980 to 2000 for ages 4 and older while mean length at age 1-3 increased after 2000. Alewife have also exhibited a trend towards “plumper” fish over the time series. No clear spatial or temporal patterns were observed for rainbow smelt. Our results will be used to inform future stock-assessment models in the main basin of Lake Huron.

Great Lakes
Management
Population

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Presenters/Authors

Jason Doll (), Michigan State University, dolljas1@msu.edu;