Journal
LIMNOLOGICA
Volume 38, Issue 3-4, Pages 258-268Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.limno.2008.06.006
Keywords
Recruitment success; Rutilus rutilus; Water quantity management; Biomanipulation
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Funding
- Landestalsperrenverwaltung des Freistaates Sachsen
- Arbeitsgemeinschaft Trinkwassertalsperren c. V
- Deutsche Forschungsgemeinschaft [Be 1671/8-1, Be 1671/8-2]
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Water level fluctuations in a drinking water reservoir (Saidenbach Reservoir, Saxony, Germany) and length-frequency data of roach (Rutilus rutilus) derived from gillnet catches were studied over a period of eight succeeding years and subsequently analysed with respect to level change and cohort establishment. The results indicate a strong impact of water level on the year class strength of roach. Constantly high water level with large areas of inundated plants led to a very strong roach year class. Conversely, decreasing water level shortly after the spawning period was found to result in a total loss of the new roach year class. Any other possible factors influencing year class strength of roach (such as food, temperature, winter duration) may only play a role if the water level after spawning remained relatively stable. Consequently, water quantity management in reservoirs can be used as a biomanipulation tool to reduce the planktivorous fish stock and to improve water quality, which should be an interesting option especially in drinking water reservoirs. (C) 2008 Elsevier GmbH. All rights reserved.
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