Monitoring of the fish community in the Hungarian reach of River Tisza in 2009

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Article Title:	Monitoring of the fish community in the Hungarian reach of River Tisza in 2009
Authors:	Károly Györe1, Vilmos Józsa1, Sándor Wilhelm 2
Affiliation:	1Research Institute for Fisheries, Aquaculture and Irrigation, Szarvas, Hungary 2Highschool Petőfi Sándor, Sacueni
Abstract:	The fish community of River Tisza was assessed in 24 sampling areas of the river between 9 and 18 September 2009. The fish community and the fish species were monitored by electric fishing. During the survey, 24 760 specimens of 47 species belonging to 13 families were caught. The individuals of only two species, Alburnus alburnus and Aspius aspius, were found in all of the 24 sampling areas. Leuciscus idus, Perca fluviatilis, Proterorhinus semilunaris, Lota lota, Silurus glanis and Esox lucius were found to be frequent species, occurring in at least two-thirds of the sampling areas. In the majority of the samples, the fish community is dominated by one, maximum two species. The total species richness of the community, as estimated using the second-order jacknife procedure, was 72. According to the EFI+ index, two sampling areas have high ecological quality, eleven are good, six moderate, four poor and one bad.
Keywords:	River Tisza, fish community, diversity indices, characteristic species, EFI+ index
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*Correspondence:	Károly Györe, Research Institute for Fisheries, Aquaculture and Irrigation (HAKI), Anna-liget 8, H-5540 Szarvas, Hungary. Tel. +36-66-515316, Fax. +36-66-312142, e-mail: gyorek@haki.hu