Biological indices of different length groups of Benni fishes (Barbus sharpeyi) from Khozestan water resources

This study was conducted in order to evaluate the biological indices of different length groups of Benni fishes (Barbus sharpeyi) from Khozestan water resources. 413 fishes between 30 to 440 mm length divided in different group,. The growth following the length/weight equation adhered from isometric rate. The results showed that increasing the relative intestine length followed by increasing the fish length. The highest relative intestine length in male fishes obtained in 440-360mm group with positive correlation coefficient which was showed the herbivorous and omnivorous feeding behavior of this species. The highest CF was measured in male fishes between 249-150 mm and 440-360mm. The variation in feeding intensity between males fishes were from 29% in 249-150mm group to 53% in 359-250mm one. The sex differentiation of 147 fishes placed in less than 100 mm group were not recognized. GSI factor revealed that this species is Gonochroistic (separated sexes). The variation between gonads in female with different length was higher fluctuation than male Benni fishes.