In this study, some biological characteristics of L. vorax were investigated in Shadegan wetland. Monthly sampling was done at five stations of Shadegan, including Doragh (mahshar), Rogabe, Khorosy, Salmane, and Atish. For this purpose, 456 specimens were caught using gill nets with 45 mm mesh from April 2012 to March 2013. Average and standard deviation length of female and male L. vorax were calculated per millimeters as 262 ± 31, 265 ± 29 and the average and standard weight in grams were measured, 192 ± 34, 194 ± 41, respectively. Length-Weight Relationship was calculated as negative alometric which was Y=0.00002L^2.88 (R²=0.88). Furthermore, spawning period was determined in January to February. In addition, maturity length and maturity weight were calculated as 266 millimeters and 162 grams, respectively, and production rate per biomass annually was computed as P/B= 0.44. Fish growth indices were calculated to be L_∞=498(mm), growth rate K=0.45 (yr^-1) annually and t_o=-0.16 respectively. According to biological characteristics and with regard to American Fisheries Society (AFS) indices, this species is classified as mediate vulnerable group fishes.