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Large enclosures experimental study on algal control by silver carp and bighead. |
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Abstract Ten large enclosures (300 m2 each) stocked with gradiant biomass (0, 10, 30, 60g/m3) of silver and bighead carps were set up on the bank of Yuqiao reservoir(China) to study the feasibility of algal control using the fish. In comparison with the increasing of blue-green algae’s proportion and the forming of microcystis bloom within the enclosures without fish, the proportion of blue-green algae maintained very low level during the experiment. However, the fish’s grazing led nanoplankton increasing greatly and then made the total algae biomass and chl-a rising in different extent. So silver and bighead carps were just suitable for controlling cyanobacteria bloom not total algae biomass. The application of the fish for algal control in water supply reservoir should be cautious.
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Received: 11 March 2009
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