Modifications in the quantitative structure of Barcău river’s fish fauna under anthropogenic pressure

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Article Title:	Modifications in the quantitative structure of Barcău river’s fish fauna under anthropogenic pressure
Authors:	Doru Ioan Ardelean
Affiliation:	“Vasile Goldiş” Western University Arad
Abstract:	As a consequence of carrying on this study, the following conclusions have been possible on the Barcau ichitiofauna: a) 34 species of fish were identified, most of them in the inferior course; b) 8-12 species are found in the area Suplac – Marghita, where the trophic impact is the most severe, and no species on a distance of approximately 2 kilometers are found immediately downstream from the refinery from Suplac; c) the number of fish individuals captured varies from one collecting point to another (48-78 individuals), being bigger at the exits from the country; d) most of the fish populations (80%) are small, in danger of extinction; e) the total fish biomass on Barcău is modest, 17,6 kg/100 m2; f) only 1/3 of the fish total are mature, which does not ensure a good reproduction; g) the number of species with economic value is small (2-4 species) and because of this Barcău is not interesting as far as fishing is concerned; h) the diversity coefficient is generally small in most sections, proving that the aquatic systems from Barcău are unbalanced.
Keywords:	water quality, pollution with petroleum, fish fauna, qualitative structure of the fish fauna
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*Correspondence:	Doru Ioan Ardelean, “Vasile Goldiş” Western University Arad