Growth estimates, habitat use and ecology of the lake sturgeon, Acipenser fulvescens Rafinesque, from Round Lake and mature reservoirs in the Winnipeg River

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Block, David
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Growth, population estimates, density, and distribution of lake sturgeon were compared among a pristine system and two mature reservoirs. Round Lake is a small unperturbed lake on the east side of Lake Winnipeg. Lake sturgeon are generally believed to be bottom dwellers but movement studies revealed that they spend extensive amounts of time in the water column above the bottom. Although 11 substrate types were identified in Round Lake, lake sturgeon, when in contact with the substrate, generally tended to select fine sand and medium sand substrates. The analysis of stomach contents of six species of fish from Round Lake indicates that Ephemeridae are the most important food item in terms of both abundance and occurrence. Lake sturgeon are known to feed on Ephemeridae in many systems therefore overlap is assumed with some of the species of fish from Round Lake. (Abstract shortened by UMI.)