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Effects of Stocked Trout, Native Small-bodied Fish, and Winter Surface Aeration on Zooplankton in Small Boreal Foothills Lakes Open Access


Other title
Stocked Trout
Boreal Lakes
Winter Aeration
Native Small-bodied Fish
Type of item
Degree grantor
University of Alberta
Author or creator
Holmes, Teslin G.
Supervisor and department
Paszkowski, Cynthia (Department of Biological Sciences)
Tonn, William (Department of Biological Sciences)
Examining committee member and department
Proctor, Heather (Department of Biological Sciences)
Vinebrooke, Rolf (Department of Biological Sciences)
Heather McDermid (Department of Biological Sciences)
Scrimgeour, Garry (Parks Canada)
Department of Biological Sciences
Date accepted
Graduation date
Master of Science
Degree level
Trout are commonly stocked into Alberta lakes to enhance angling opportunities. Many of these lakes contain native fish and require aeration to prevent trout winterkill. I assessed effects of trout and native fish on zooplankton abundance, biomass, size, community composition, and vertical distribution among six stocked, five unstocked, and three fishless lakes in the boreal foothills; I also investigated the impact of aeration in a Before-After-Control-Impact study. Stocked trout had limited affects on zooplankton communities and populations in lakes containing native fish, with greater microcrustacean richness and greater abundance of one rotifer species. Fish-bearing lakes (stocked and unstocked), however, differed greatly from fishless systems, with higher abundances of most taxa but smaller cladoceran and calanoid sizes. In fish-bearing lakes, conspicuous zooplankton also demonstrated selection for deeper water. No effect of aeration was detected. Thus, impacts of trout and aeration on zooplankton in boreal foothills lakes containing native fishes appear limited.
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