Identification and distribution of fish fauna in Tilabad stream (Golestan province)

In order to ponder the abundance, distribution and diversity of fish and relationship to environmental factors were studied in the Tilabad stream, from summer 2009 to spring 2010. Specimens were caught by electrofishing (DC, 200-300V). Results show that three species of fish have been identified including: Spirlin (Alburnoides eichwaldii), Capeta (Capoeta capoeta) and loaches (Paracobitis malapterura). The estimated population was calculated as for density in different seasons. Capoeta and spirlin was caught the highest frequency in all four seasons so that Capoeta were dominant species (P<0.05). In Tilabad stream, the presence of Spirlin was positive and significant correlation with the amount of vegetation and channel insection and Capoeta had the highest positive correlation with turbidity and stream width and also the presence or absences of Loaches were positive correlated to riffle (P<0.05).