Substrate Preferences of Juvenile Hatchery-reared Lake Sturgeon, Acipenser fulvescens |
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Authors: | Stephan Peake |
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Institution: | (1) Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada (e-mail |
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Abstract: | Substrate preferences of juvenile, hatchery-reared lake sturgeon, Acipenser fulvescens, from a Wisconsin population were examined relative to water temperature and velocity, fish size and time of day. Given the choice of a sand, gravel, rock or smooth plastic bottom, all sturgeon were strongly attracted to the sand substrate. Water temperature did not affect substrate preference, however small sturgeon (13.5cm mean FL) acclimated to 19°C were more active than those tested in 6°C water. Small sturgeon, under all conditions, were less sedentary in the early morning and late evening hours than during the daytime. Preference of small sturgeon for sand was slightly stronger when a current of 5cmsec-1 was present. Substrate preference of larger sturgeon (24.3cm mean FL) was not affected by any of the parameters examined. In general, hatchery-reared lake sturgeon showed similar behaviors (with respect to substrate selection) as those previously described for the same population in the wild, making it possible that substrate preferences have a genetic component and likely that hatchery rearing does not alter instinctive behavior. |
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Keywords: | Acipenseridae habitat selection activity patterns aquaculture |
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