Survey on some population structure of Kura barbel (Barbus lacerta ) in Kesilian River in Mazandaran province

In this study, 281 specimens Barbus lacerta have caught by electrofisher in Kesilian River (An affluent of Telar River) from August 2008 to July 2009. twenty-six morphometric and te meristic characteristics have studied. Based on results, average of variation coefficient of morphometric characteristics Barbus lacerta in Autumn, Winter, Spring and Summer were 19.38, 21.20, 22.61, 26.02 and for meristic characteristics were 6.16, 6.24, 6.67and 7.27 percent, respectively. morphometric characteristics modified and standardized before analyzing because of decreasing of error due to allometric growth. For morphometric characteristics, eight factors accounted for a bout 77.69% individuals of the four seasons and in the case morphometric traits two factors accounted for 70.89% of diversity within seasons. In these results it was not seen any differences between seasons by analyzing method and have highly proportional overlapping. Also, there were twenty-six significant differences and meristic characteristics between seasons(P  0.05), but four characteristics did not show significant differences (P< 0.05). According to analyzing with main parameters it did not seen any distinctions between seasons and they had relatively overlapping. There was a great correlation between length and weight into all seasons. Obtained regression coefficient (b) from length-weight relationship as well as results from determination of growth pattern showed by poulie method that growth pattern in Autumn and Spring in Barbus lacerta is negative allometric and then for Winter and and Summer is positive isometric and positive allometric, respectively.