Piscivory by brown trout Salmo trutta L. and Arctic charr Salvelinus alpinus (L.) in Norwegian lakes

Journal of Fish Biology - Tập 41 Số 1 - Trang 91-101 - 1992
Jan Henning L'Abée‐Lund1, Arnfinn Langeland2, Harald Sægrov3
1Department of Zoology, University of Trondheim, N-7055 Dragvoll, Norway
2Norwegian Institute for Nature Research, Tungasletta 2, N‐7005 Trondheim, Norway
3Department of Animal Ecology, Museum of Zoology, University of Bergen, Muséplass 3, N‐5007 Bergen, Norway

Tóm tắt

Size and frequency of occurrence of prey of brown trout Salmo trutta L. and Arctic charr Salvelinus alpinus (L.) were recorded in 13 Norwegian lakes during 1973–1990. Piscivores usually comprised less than 5% of the total population. Arctic charr were less piscivorous than brown trout. Trout and charr became piscivorous at 13 and 16 cm length, respectively. These size thresholds were similar to those of other facultative piscivorous freshwater fish species. When present, three‐spined sticklebacks, Gasterosteus aculeatus (L.), were preferred by all length groups of piscivorous brown trout and Arctic charr. Length of prey increased with increasing predator length, and the mean body length of prey was about 33 and 25% of predator length for trout and charr, respectively. Yearlings of charr were not recorded as prey.

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