The relationship between fish yield and primary production in large European freshwater lakes |
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Authors: | Galina M. Lavrentyeva Peter J. Lavrentyev |
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Affiliation: | (1) State Research Institute on Lake and River Fisheries, (GosNIORKH), Makarova 26, 199053 St. Petersburg, Russia;(2) Russian Academy of Sciences, Institute of Limnology, Sevastyanova 9, 196199 St. Petersburg, Russia |
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Abstract: | The data published on fish yield (Yf) and primary production (PP) in three large European freshwater lakes (Ladoga, Ilmen and Pskovsko-Chudskoe) were analyzed on a long-term basis. The ratios between Yf and PP were found to vary from 0.02% to 0.46%. It was shown that there was an optimal level of PP, above which the efficiency of energy transfer in the pelagic food chain began to decrease. An individual optimum of PP was characteristic of each of the lakes studied. This level was primarily determined by the original trophic status of a given lake as well as by its morphometry and hydrochemistry. The results warn practical ecologists against erroneously predicting commercial harvests from PP. |
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Keywords: | Fish yield primary production Lake Ladoga Lake Ilmen Lake Pskovsko-Chudskoe |
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