Investigating of macrobenthic community structure in Sirvan River (range: Palangan fish farms)

Document Type : Original Article

Authors

1 university of urmia,faculity of natural resources, department of fisheris

2 university of urmia,faculty of natural resources, department of fisheris

3 Assistant Professor, Department of Artemia, Urmia lake Institute, Urmia University, Iran

4 PhD student, Department of marine science, Tarbiat modares University, Iran

Abstract

In this study, from January 2015 until the June 2015 macrobenthic community was examined at four stations used the water quality of the Sirvan River, which was affected by the Palangan fish farm wastewater. For sampling of benthos, Sorber was used. In the study of the benthic rivers, 4148 species were identified, separated, and belonged to 25 families, 15 order, and 22 genera. Among them, larvae of aquatic insects have been most diverse. The lowest number of benthos in station 1 and in March was Odanata with one per square meter and the highest number belonged to Ephemeroptera at station one and in June with 375 per square meter. The Hilsinhof biological indices, Shannon diversity and OC percentage (Oligochaeta + Chironomidae) showed a statistically significant difference (P<0.05). The percentage of EPT was significantly affected by the interactions between the season and station (P<0.05). However, the frequency, EPT, and EPT/ Chironomidae did not show a significant difference between season and station (P<0.05). Based on the results obtained from the upstream stations to the low distribution and the frequency of contaminated organisms, they increase against contaminated organisms, which indicates the desired quality of the downstream stations relative to the upstream stations. In addition, fish farms wastewater in the studied area has good purification. 

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