Management of fish stocks

As overall condition of water resources is getting worse, there is a need to restore them in many different ways. Biomass overgrowth of lakes and annual blue-green algae bloom as a result of eutrophication has reduced the overall use of water resources as seen from a point of recreational and leisure use. Also fish stocks have changed so that less valuable fish like cyprinids (roach etc.) dominate at the cost of valuable fish like salmon and trout. Selective fishing is an effective way to reduce the overgrowth of less valuable fish populations and at the same time reduce eutrophication of water bodies. Seine-fishing

External loading affects to the condition of eutrophicated water bodies and there is also intensive internal loading, caused by fish population. Roach stocks cause problems in ecosystem by digging sediment from the bottom of the lakes, which leads to water murkiness. They also eat a lot of zooplankton, which leads to increased algae growth. Management of fish stocks is the most common method to restore water bodies and plays a significant role to reduce still growing internal loading to the lakes. It's a good way
to improve the overall state of the water bodies.

To improve overall condition of  water bodies, there are several ways to catch fish. Most efficient ways  are traditional seine fishing, fish traps and trawling. Fishing takes place usually at the open water season, but there are also good experiences of winter-seining. Different ways of fishing are suitable in different types of lakes,
according to profile of lake and also how fish moves. 

 

Small fish

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