Food and growth of age-0 smelts, Osmerus eperlanus, in a Norwegian fjord lake |
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Authors: | T. F. Næ sje,B. Jonsson,L. Klyve, O. T. Sandlund |
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Affiliation: | Directorate for Nature Management, Fish Research Division, Tungasletta 2, N–7000 Trondheim, Norway;Biological Institute, University of Oslo, P.O. Box 1050, Blindern, N-0316 Oslo 3, Norway;Royal Norwegian Society for Rural Development, P.O. Box 115, N-2013 Skjetten, Norway |
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Abstract: | Pennate diatoms, especially Aslerionella spp. and Tabellaria fenestrata , were the most important food items for smelts in Lake Mjøsa during the first month of external feeding; rotifers and early stages of copepods were eaten occasionally. Later, during summer and autumn, crustacean zooplankton (cladocerans and copepods) were the most important food items; selected species were Polyphemus pediculus, Eudiaptomus gracilis, Limnocalanus macrurus, Heterocope appendiculata. Leplodora kindti , and Bythotrephes longimanus ; some smelts larger than 7.4 cm fed on Mysis relicta . In 1979 and 1980, mean lengths of smelts in October-November were 4.7 cm and 7.2 cm, respectively. A difference in length increment between the two years may have resulted from summer water temperatures being higher in 1980 than in 1979. |
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