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STUDY ABOUT THE FISH FAUNA CHANGES IN THE ORGANIC POLLUTED STRETCHES OF CRIÂȘUL REPEDE RIVER (BIHOR COUNTY, WESTERN ROMANIA)


ILIE C. TELCEAN, DIANA CUPƞA, SEVERUS DANIEL COVACIU-MARCOV, ISTVAN SAS

Issue:

SCSB, Volume X

Section:

Ecology, Limnology

Abstract:

The rivers pollution due by the waste-waters spilling downward from the villages is caused a visible impact on the river’s fish fauna. According to recent studies (Telcean & KĂĄroly, 2000; Telcean et all. 2002 a, 2002 b, Telcean et. Bãnãrescu, 2002 c) the organic pollution are affecting an increased number of the Romanian rivers. CriÂșul Repede River is one of the most important rivers in the north-western Romania. Its course is passing the state border to Hungary there were join the Tisa River. The fish fauna of CriÂșul Repede River is maintaining less affected comparing to the other Romanian rivers. Although the industrial pollution is missing, the fishes from middle and lower stretches of CriÂșul Repede River are threatened by a number of human activities. Worst of them are the river damming or levees building along the riverside, also the house-wastes left in the riverbed and the waste-waters spilling. The most harmful is the river damming that is caused the water level fluctuations and the lost of long flowing river sections (Bãnãrescu, 1994). The present paper aims to reveal the local effect of waste-water spilling and the organic accumulation on the riverbed. We need to determine how are these factors to bring the species number decline and the changes of some species occurrence. The diffuse pollution with waste-waters derivate from the villages has a long term influence. The fish populations are not disappearing in these river stretches, but they are registering different changes, more of them being less visible.

Keywords:

fishfauna, CriÂșul Repede River, waste-waters.

Code [ID]:

SCSB200510V10S04A0015 [0002559]


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