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Biomass dynamics of fishing in estuarine lakes Lebsko and Sarbsko

100%

Orzechowski B., Obolewski K.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

2008

tom 12

The research has shown the domination of fluctuative trends in the biomass dynamics for a major-ity of the caught fish species and decrease in the stocks of littoral phytophil fish. The main reason of the fishery breakdown of the pike perch in Łebsko and perch in Sarbsko was exploitation at a too big scale. The resources of the mentioned fish populations were drastically violated in the first decade of the 47 years of exploitation, that is in the years: 1952-1999. However, the highest fishing level of most of the fish species in annual cycles was achieved notoriously at spawning pe-riods during the whole 47 years. It just goes to show a complete ignorance of valid periods and the protective dimensions in the fishery practice. In the consecutive decades and for all the 47 years, the position and the degree of mass dominance for separate species of fish in fishing have been es-tablished. Pairs of superdominants and eudominants with the greatest quantitative participation in fishing have been distinguished for each of the lake. For the regeneration of the pike’s, the tench’ and the crucian carp’ population fishing of those species should be banned for the time of their generation. Reduction to small Cyprynidae species should be conducted by intensive stock in Łebsko with the pike and in Sarbsko with the pike-perch.

A zooplankton-based study of coastal lakes

88%

Paturej E.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

2009

tom 13 part II

Numerous brackish estuarine water bodies are situated in the Polish Baltic Coastal Zone, including smaller and bigger lakes like Sarbsko, Łebsko, Gardno, Wicko, Kopań, Bukowo, Jamno, Resko Przymorskie, Liwia Łuża, Koprowo and Wicko Wielkie. Despite a similar genesis and geomorphological type, these lakes are characterized by different hydrological and hydrochemical conditions, determined by the predominance of terrestrial or marine factors. The origin of Polish coastal lakes and transboudary water bodies is closely related to the history of the Baltic Sea and the last glaciation. Coastal brackish waters have been inhabited by both marine and freshwater organisms.

Ograniczanie wyników

2 Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

1 Obolewski K.

1 Orzechowski B.

1 Paturej E.

1 2009

1 2008

Wyniki wyszukiwania

Biomass dynamics of fishing in estuarine lakes Lebsko and Sarbsko

A zooplankton-based study of coastal lakes