Aquatic Vegatation Photosythesis

Aquatic Vegatation Photosythesis-72
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In dense plants piscivorous fish may be more common at the periphery of the plant beds or in the “holes” in aquatic plants.

Creation of strips of intermediate vegetation density or open lanes within the vegetation is thought to enhance the stocks of piscivores and the access of sport fishermen to these fish. (1998) removed aquatic plants from about 20% of the littoral zone by cutting a series of channels through each of the four investigated lakes in Wisconsin (USA).

In the first year after manipulation, bluegill and largemouth bass substantially increased growth rates of some age classes.

The results suggest that harvesting macrophytes in a series of deep channels may be a valuable tool for integrated management of fish and macrophytes.

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This applies to large lakes of East Africa, reservoirs in Asia and Latin America, floodwater lakes (lagoons) in Papua New Guinea, and many other water bodies.

Massive spread of the indigenous floating macrophyte Pistia stratiotes on one arm of the Volta Lake (reservoir) in Ghana has also represented an obstacle to fishery activities.

Biological control using fish has been successful only in some situations concerning submersed plants, but fish have made little impact on floating plants.

Over the last 20 years Lake Seminole, Alabama (USA) has experienced a dramatic increase in the coverage of Hydrilla verticillata, peaking at about 65% surface area in 1992.


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