Thiamine deficiency in Great Lakes salmonines results in early life stage mortality. To determine the prevalence and severity of low thiamine in lake trout eggs, thiamine concentrations were determined in eggs collected in fall 2012 from lakes Michigan, Huron, Erie, Ontario and Cayuga. Lake trout egg thiamine concentrations in Lake Huron were high (3.6 to 36 nmol/g) and the proportion of females with eggs thiamine lower than the recommended management objective of 4 nmol/g was negligible. In Lake Ontario, Erie and Michigan, thiamine concentrations varied from below detection limit to 30 nmol/g and the proportions of females with eggs thiamine below 4 nmol/g was significant (up to 85% of females at some sites). All females collected from Cayuga Lake presented thiamine concentrations below 4 nmol/g. These results confirmed earlier report that condition of lake trout egg thiamine is improving in L. Huron, probably due to the decrease of alewife abundance.
|Presenter:||Logan M Stratton (Undergraduate Student)|
|Time:||10:45 am (Session II)
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