engleski

Changes and structure of ichthyofauna during the 50 years of existence of the hydro accumulation Bajer and Lokva

Ichthyological investigations in Gorski Kotar on the accumulation waters of Bajer and Lokva were carried out in the spring, summer and autumn of 2005. The catch was conducted by standard ichthyological methods with an electrogenerator and gill nets of various mesh sizes. The results were compared with those of the catch from 1987 and some qualitative and quantitative changes occurred in the ichthyofauna. In the Bajer accumulation new species were recorded ; Northern Pike, European Perch, Pumpkinseed and Grass Carp, and the Common Minnow and Rainbow Trout were not recorded. In the total catch of 241 individuals, with the total mass of 130.7 kg, there were 10 fish species. The Shannon-Wiener index of ichthyodiversity in the Bajer accumulation was 2, 318, and the Reciprocal Simpson index was 4, 186. The most numerous fsh was the Common Chub, and in the ichthyomass the most representative was the Tench. Some new species occurred in the Lokva lake ; Northeren Pike, European Perch and Prussian Carp, and the Crucian Carp was not recorded there. Eight species of fish were caught, 353 individuals, with a total mass of 109735.5 g. The Shannon-Wiener index of ichthyodiversity in the Lokva lake was 2, 078, and the Reciprocal Simpson index was 3, 252. The most frequently caught species was the Common Chub, and in the ichthyomasss the most representative was the carp. The number relation of fsh in the Bajer and Lokva accumulations were changed for the good of the warm water fish species.

Ichthyofauna; Gorski Kotar

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