Factors governing the growth rate of roachRutilus rutilus (L.) in pre-alpine Lake Sarnen |
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| Authors: | Rudolf Müller Hans Jürg Meng |
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| Institution: | 1. Lake Research Laboratory/EAWAG, CH-6047, Kastanienbaum, Switzerland
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| Abstract: | Most of the mesotrophic to eutrophic lakes in central Europe have been showing signs of oligotrophication during recent years. The question as to how the fish populations would react to this new situation was investigated looking at the growth rate of roachRutilus rutilus (L.) of Lake Sarnen, central Switzerland. The water temperature sum as day-degrees over 12 to 13°C for the months of June to October was found to be the predominant factor governing the marked year-to-year fluctuations of the growth rate. Contrary to expectation, the decreasing trophic state of the lake has not yet manifested itself noticeably in the growth rate. |
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