Length-weight relationship and relative condition factor of Schizothorax eurystomus Kessler, 1872 from Fergana valley

The focus was on the length-weight relationship and relative condition factor of Schizothorax eurystomus from Fergana Valley, which was studied for eight months (August-December, 2016, January 2017 and July-August, 2019). During the study, 125 fish samples were studied, including 16 females, 48 males and 61 immature, with a total body length from 6.16 to 29.2 cm and weight from 2.12 to 216.23 grams. The parameters “a” and “b” of the length-weight relationship were estimated using the equation W=aLb while the relative condition factor was also calculated from the equation, Wr = 100w/am Lbm. The regression coefficient “b” values were 2.7486; 3.0724; 3.1179 and 3.0874 for males, females, immature and combined sexes, respectively. The general results showed positive allometric growth (b>3) exhibited by the species. The mean “Wr” value for the females was 100.22±6.83, males 100.37±8.57, immature 100.27±7.45 while the combined sex was 100.37±8.53 and there was a significant difference among the sexes.