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Biomanipulation, will it work for your lake? A simple test for the assessment of chances for clear water, following drastic fish-stock reduction in shallow, eutrophic lakes Hosper, H.; Meijer, M.-L. (1993). Biomanipulation, will it work for your lake? A simple test for the assessment of chances for clear water, following drastic fish-stock reduction in shallow, eutrophic lakes. Ecol. Eng. 2(1): 63-72 In: Ecological Engineering. Elsevier: Amsterdam; London; New York; Tokyo. ISSN 0925-8574; e-ISSN 1872-6992, meer

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Trefwoorden

Aquatic organisms > Freshwater organisms > Fish > Freshwater fish Control > Pollution control Management > Environment management Management > Resource management Pollution > Water pollution > Freshwater pollution Population characteristics > Population number Water bodies > Inland waters > Lakes Water bodies > Inland waters > Lakes > Eutrophic lakes Water bodies > Inland waters > Lakes > Freshwater lakes Pisces [WoRMS] Zoet water

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Auteurs		Top
Hosper, H. Meijer, M.-L.

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Abstract

From the results of biomanipulation case studies in the Netherlands, a simple test was derived for the assessment of chances for clear water, following fish stock reduction. The test is directed primarily to lake managers of shallow, eutrophic lakes in order to enhance the performance of new biomanipulation projects. A prerequisite for success is that at least 75% of the planktivorous and benthivorous fish are removed from the lake. The chance for a clear-water period after fish reduction is determined by the opportunities for large Daphnia species and by the impact of benthivorous fish and wind on sediment resuspension. A bloom of filamentous Cyanobacteria (> 100 000 ind./ml) and large numbers of mysid shrimp (Neomysis spp. > 100 ind./m super(2)) in early spring may prevent the development of Daphnia) and consequently a decrease in algal biomass. Submerged macrophytes play a key role in stabilizing the clear-water state. Long-term stability is expected at total phosphorus concentrations < 0.10 mg/l. By proceeding through questionnaires the lake manager can assess the chances for success of biomanipulation.

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