Regional application of a fish yield estimation procedure to lakes in north-east Germany |
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Authors: | Uwe Brä mick,Roland Lemcke |
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Affiliation: | 1 Institute of Inland Fisheries Potsdam-Sacrow, Gross Glienicke, Germany 2 Agency of Agriculture and Fisheries Mecklenburg-Vorpommern, Institute of Fisheries, Rostock, Germany |
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Abstract: | Primary production and total phosphorus, respectively, have recently been used as the main variables to estimate the fish yield potential of lakes. In order to improve the accuracy of the estimation procedure for regional applications, two major adaptations were implemented. Both the relations between total phosphorus and primary production as well as primary production and corresponding fish yield potential were adjusted to specific regional conditions in north-east Germany and production patterns in shallow lakes, respectively. Applied to 786 lakes, the adapted procedure led to estimated fish yield potentials in the range of 8 … 67 kg/ha · a with shallow lakes showing significantly higher potentials than stratified ones. A comparison of estimated yield potentials with current yield statistics revealed an improved conformity of estimates attained by using the adapted procedure. |
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Keywords: | Fish yield estimation nutrient dynamics primary production shallow lakes |
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