investigation of carapace frequency, length-weight relationship and biomass of jinga shrimp (metapenaeus affinis) in shrimp fishing grounds of hormozgan province

abstract this study, aimed to achieve carapace length frequency, depth distribution, determining biomass and length-weight relationship of metapenaeus affinis in shrimp fishing grounds of hormomzgan province. sampling was carried out by trawl net and swept area method from january 2010 to february 2011. samples were transferred to the laboratory and biometric information entered on special forms. maximum carapace length was 35 and 47 mm for males and females, respectively. maximum carapace length frequency was belonged to 20-22 mm range for both sexes. also maximum carapace length of population was found in march for both sexes. length-weight relationship was w = 3e-06tl3.1465 for males and w = 4e-06tl3.149 for females. according to the b factor, metapenaeus affinis had a positive allometric growth. biomass of m. affinis was calculated 822 ton in 2011.  in the distribution of deep layers, it was found that maximum biomass was related to layer 10-20.