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Effects of entrapment and cooling water discharge by the Bergum Power Station on 0+ fish in the Bergumermeer

  • W. L. T. van Densen
  • R. H. Hadderingh
Chapter
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Part of the Developments in Hydrobiology book series (DIHY, volume 11)

Abstract

The numbers, distribution and size of 0+ fish in Bergumermeer and in the cooling water system of the Bergum Power Station were registered from 1978 to 1981. An exponentially decreased vulnerability to entrapment by the power station was found with increasing size of fish. Because of the large water intake in relation to the lake volume, entrainment mortality of fish larvae in May and June is large and probably of the same order of magnitude as the natural mortality. In the same period the Bergumermeer can be supplied with large amounts of fish larvae, immigrating passively with the water current. Impingement mortality later on in the season is insignificant compared with natural mortality. The heated effluents from the power station influence the distribution and the size of 0+ fish in the lake. Year-class strength of pikeperch may be improved due to the larger size of 0+ pikeperch. Less water intake as a possibility to minimize entrainment is discussed.

Keywords

thermal pollution fish ecology 0+ fish entrapment mortality cooling water 

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Copyright information

© Dr W. Junk Publishers, The Hague 1982

Authors and Affiliations

  • W. L. T. van Densen
    • 1
    • 2
  • R. H. Hadderingh
    • 3
  1. 1.Tjeukemeer LaboratoryLimnological InstituteOosterzeeThe Netherlands
  2. 2.Department of Fish Culture and Inland FisheriesAgricultural UniversityWageningenThe Netherlands
  3. 3.N. V. KEMAArnhemThe Netherlands

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