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Experimental estimation of the food intake of larval vendace (Coregonus albula L.) under field conditions
Authors:Karjalainen  Juha  Viljanen  Markku
Institution:(1) Karelian Institute, Saimaa Research, University of Joensuu, P.O. Box 111, SF-80101 Joensuu, Finland
Abstract:We estimated the food intake of larval vendace (Coregonus albula L.) directly in an experimental chamber under field conditions. The larvae were stocked into net enclosures and reared without additional feeding for 6 weeks immediately after the ice melted in Lake Ylä-Enonvesi, Eastern Finland. The food intake was estimated on the basis of the decrease in zooplankters due to larval predation in the transparent plastic chambers anchored in the littoral zone. The experiments were carried out twice in 1988 and three times in 1989 (May–June). The numbers of zooplankters inside the chambers were counted from the subsamples using an inverted microscope. The relative daily ingestion rate (mg dry mass of prey animals mg dry mass of fish –1 24 h–1) of the larvae of different sizes was: 1.09 and 0.84 for 9–11 mm larvae, 1.27 for 11–13 mm larvae and 0.34 for 17–20 mm larvae. The measured ingestion rate is presumed to be near the maximum consumption of the larvae. This method could provide accurate estimates of food consumption in the field or in the laboratory.
Keywords:coregonid  experiment  feeding  food intake  vendace larvae  zooplankter
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