Thiamine status of lake sturgeon eggs from USA and Canada

Session: Poster Session

Marc Chalupnicki, Tunison Lab. of Aquatic Sciences, U.S. Geological Survey, mchalupnicki@usgs.gov
Dawn Dittman, USGS Tunison Lab. of Aquatic Sci., ddittman@usgs.gov
George Ketola, Tunison Lab of Aquatic Science, gketola@usgs.gov
Micheal Zehfus, Black Hills State Univeristy, michael.zehfus@bhsu.edu

Abstract

During spring 2010 to 2015, eggs were collected for analysis of total thiamine from gravid lake sturgeon (Acipenser fluvascens) from populations across the USA and Canada. Mean egg thiamine concentrations ranged from 1.0±0.6 to 4.3±0.2 nmol/g across all populations. Thiamine concentrations for multiple-year samples for Michigan, Canada, Wisconsin, and New York populations were 3.4±0.3, 2.7±0.7, 2.3±0.5, and 1.8±0.2 nmol/g, respectively. Control populations of white sturgeon (Acipenser transmontanus) and pallid sturgeon (Scaphirinchus albus) had significantly higher total thiamine values at 4.3±0.7 and 5.4±0.3 nmol/g, respectively. Although highly variable within populations and across years, thiamine concentrations in most spawning adults appear to be adequate in all the waters for the years sampled. Hatch success and mean total thiamine concentrations were higher in populations that were not hormone induced to initiate spawning activity.