Further faunistic and ecological investigation of the lamprey and fish fauna of the Mlava river [Serbia, Yugoslavia] upper course

Simonovic, P. . Faculty of Belgrade, Institute of Zoology; Valkovic, B.; Ivkovic, Z.

Further faunistic and ecological investigation of the lamprey and fish fauna of the Mlava river [Serbia, Yugoslavia] upper course

1996

Simonovic, P. (University of Belgrade, Belgrade (Yugoslavia). Faculty of Belgrade, Institute of Zoology) | Valkovic, B. | Ivkovic, Z.

The 1996 summer season, an investigation of the Mlava river (Serbia, Yugoslavia) upper course was performed. In relation to previous investigation, two new cobitid species were found, e.g. the stone loach Barbatula barbatula and the Balkan loach Cobitis elongata. Apart from certain movements of particular fish species between sampling profiles, their distribution mostly confirmed previous expectations. Thus, the two upper profiles could be denoted as salmonid region, whereas the lowest profile is transitional, i.e. the barbel region. The effect of salmonid fish-farm at the spring of the Mlava river to the brown trout seems negligible, in spite of the evident deterioration of water quality according to chemical and microbiological parameters. It seems that main reason for the limited distribution of brown trout is gradual increasing of the water temperature. It is to be considered that this brown trout population is separated from others, from the distant downstream tributaries of the Mlava river middle course, but the confirmation of that premise needs further investigations.

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