Changes in the diet of charr Salvelinus alpinus L. after introduction of Mysis relicta Loven in two subalpine reservoirs in Norway
The mysid crustacean Mysis relicta was introduced into two Central Norwegian subalpine reservoirs, Stugusjøen and Gjevilvatn in 1973. Maximum density of Mysis was reached 9 to 10 years after the transplanting; densities later diminished to a low level. The introduction of Mysis in Stugusjøen has re...
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| Format: | Article |
| Language: | English |
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Norwegian University of Science and Technology
1986-12-01
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| Series: | Fauna Norvegica |
| Subjects: | |
| Online Access: | https://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/6100 |
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| Summary: | The mysid crustacean Mysis relicta was introduced into two Central Norwegian subalpine reservoirs, Stugusjøen and Gjevilvatn in 1973. Maximum density of Mysis was reached 9 to 10 years after the transplanting; densities later diminished to a low level. The introduction of Mysis in Stugusjøen has resulted in a large decline in the Cladocera population. From 1978 to 1985, charr diet in the two lakes has usually comprised 20% to 60% Mysis during spring and autumn in the two lakes. The amphipod Pallasea quadrispinosa was an important part of charr diet in Stugusjøen during spring. There has been a decrease in catch per effort and in mean weight for charr in both lakes during the study period.
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| ISSN: | 1502-4873 1891-5396 |