اکبر عباس زاده

The some biological characteristics of Nemipterus japonicus (Bloch, 1791) was studied during the period from September 2012 to February 2013 by regular monthly collections in coastal waters of Persian Gulf (Bushehr Province). A total of 285 specimens, including 101 males and 184 females were collected. Results indicated that, sex ratio was 1:1.83 (male to female). Chi sqare test was applied to compare male and femal frequency, and show did a significant difference (p>0/01, df=1, X2 =24.17). The size range for male was 16.8 to 27 cm and weight 100 to 380 gr and for female, 17 to 26.5 cm and weight 98 to 303 gr, respectively. Females showed a higher frequency than males in the samples (64.56%). The Mean fork length for males was 23.38±2.77 and for females was 21.01±1.61 cm. The everage total weight of males and females were 242.21±7.72 and 172.06±2.84 gr, respectively. The relationship between fork length-weight for total samples were W=0.030FL2.83 (r2 = 0.93; n=285). There is no significant difference in length- weight relationship of male and female. The most length frequency for males and females were belonged to the length classes 24.14-27.2 cm and 19.04-21.08 cm, respectively.The values of condition factor ranged between 1.34 to 2.52, also mean values of condition factor were equal to 1.82 and 1.83 for male and female respectively. Peak values of condition factor are associated with accumulation of fat.