Autochthonous and allochthonous species in fish assembley in the Gruza [water] reservoir [Serbia (Serbia and Montenegro)]
2005
Simovic, S. | Markovic, G.(Univerzitet u Kragujevcu, Cacac (Serbia and Montenegro). Agronomski fakultet)
The Gruza water reservoir, constructed in 1984, is one of the largest reservoirs in Serbia. Recently, remarkable changes have occurred in the ichthyofauna composition. Deteriorated water quality, an onset of eutrophication, an intensive catch, the onset of diseases and other factors induced significant changes in the fish community composition. Over the period 1991-1999, the Gruza water reservoir ichthyofauna included 18 species (13 autochthonous and 5 allochthonous) from five families (Cyprinidae, Siluridae, Esocidae, Percidae and Centrarchidae). The family Cyprinidae predominates in the number of species (13) and the number of individual specimens (74.68% caught). Over-production of trash fish observed whereas number of predators decreased. Propagation of allochthonous fish, especially Carassius gibelio, threatens autochthonous ichthyofauna. The changes in the ichthyofauna composition beside analysis of other hydrochemical and hydrobiological parameters indicated the aggravation of general ecological conditions of this ecosystem.
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