Abstract
The whitefish (Coregonus lavaretus) in Lake Tyrifjorden, southeastern Norway, is monomorphic with regard to gill raker number: (x=32), and exhibits a bimodal length distribution. The small whitefish (<27 cm) were distributed mainly in the littoral zone and the deeper layers of the pelagic zone. The larger whitefish (>27 cm) were mainly distributed in the upper layers of the pelagic zone. Both small and large whitefish fed on zooplankton in the pelagic zone. In the littoral zone the diet of the two size groups was significantly different; the small whitefish fed mainly on zooplankton whereas the large whitefish fed mainly on zoobenthos.
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Hessen, D.O., Skurdal, J., Vøllestad, L.A. et al. Habitat use among size groups of monomorphic whitefishCoregonus lavaretus . Hydrobiologia 137, 185–192 (1986). https://doi.org/10.1007/BF00004214
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DOI: https://doi.org/10.1007/BF00004214