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Effects of fish density and relative abundance on competition between larval lake herring and lake whitefish for zooplankton

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Abstract

Competition for zooplankton between larval lake herring (Coregonus artedi) and lake whitefish (C. clupeaformis) was compared in mesocosm experiments in a small lake. Both species were combined in test enclosures at relative abundances of 1:1 or 1:4 lake herring to lake whitefish at densities of 500; 1, 000; and 2, 000 fish per cage, and were allowed to feed ad libitum on available zooplankton. After 60 days, at 500 fish per cage and a 1:1 ratio, lake whitfish were significantly larger than lake herring. At 1, 000 and 2, 000 fish per cage, lake herring and lake whitefish exhibited similar depressed growth rates. Survival was lower (30-50%) in the nets with 2, 000 fish than in the lower fish densities. We suspect that diet similarities of juvenile lake herring and lake whitefish in addition to the larger size and more aggressive behavior of larval lake whitefish resulted in the depressed growth and poorer survival for lake herring.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Effects of fish density and relative abundance on competition between larval lake herring and lake whitefish for zooplankton
Year Published 1995
Language English
Publisher E. Schweizerbart'sche Verlagsbuchhandlung
Publisher location Stuttgart, Germany
Contributing office(s) Great Lakes Science Center
Description p. 163-171
Larger Work Type Book
Larger Work Subtype Other Government Series
Larger Work Title Biology and Management of Coregonid Fishes -- 1993
First page 163
Last page 171
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