Study on Bentic organisms of Ghazal Ozan River in Zanjan Province

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Abstract

Ghazal Ozen is one of the two main Caspian Sea catchments entering to the Sefidrood Dam.
Sampling was done within 45 days from October 2009 till October 2011 on 3 stations. Benthic
samples were fixed with %4 fomaline and were identified to the genus or species levels and
investigated using to the Hilsenhoff biogogical index. In this study, 20 genera 7 orders were
identified chironomidae as dominant family. Hilsenhoff Biological Index (HBI) for the 9 studied
stations, were respectively, 5.4, 6.3, 5.46, 5.11, 5.13, 4.13, 4.25, 4, 4.23.The biological status of
rivers based on HBI data was in the range of very good level. In the study, Chironomidae (30%),
caenis sp. (16%), Baetis sp.(12%), Hydropsyche sp. (13%), Simmulium sp. (11%), Tabantus atratus
and Sericostoma sp. (2%) and remaining benthos (14%) in Ghazan Ozan River. The results showed
that the presence of organic matter pollutant has reduced oxygen levels and also affected the biota
in Ghazal Ozan River.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 4 - Serial Number 81
May and June 2013
Pages 125-138

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