The effect of Palangan Fish Farming on the macro-invertebrate of the Sirvan River Using Shannon and Hilsinhof Biological Indices

In the present study, effect of Palangan fish farms on abundance and distribution of macro-invertebratein three stations including 1) upstream station, 2) station a hundred meters after fish Farms  and 3) 1 km after fish farms from January 2015 until  June 2015 was investigated.  For evaluation of different stations, indicators such as Hilsinhof (HFBI) and Shannon Diversity  indices, were used. In  this study, 4148 benthic animal were identified, that were belong to 18 families, 13 orders  and 20 genus. Based on results, in terms of HFBI index and Shannon diversity, stations showed a significant difference (p <0.05). In general, the highest and lowest densities in March and June and Variety in May and February, respectively were observed. The most frequent macrobenthose belonged to station 1 in upstream and the lowest frequency at station 2 was located  in 100 meters after farms. On average, highest and lowest Shannon Weiner Diversity indices were in June and Feberiery, May respectively. On average, Shannon Wiener Diversity Index was 1.26 over a 6-month period.  From point of view water quality situation  of  the river  in station 1 were exellent  and in station 2  due to arrival of pollution was moderate. The average of the highest and lowest Hilsinhof  index was in May and March, respectively. On average,  Hilsinhof   index  was 5.94 over  the course of  6 months.  From point of view  water  quality situation  of  the river  in station 1 were exellent  and in station 2  due to arrival of pollution was moderate.