Journal of Marine Biology

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During the years 2002-2003, some biological aspects of one of fish species, Javelin grunter (Pomadasyskaakan), were investigated in the Oman Sea along Sistan-O-Baluchistan province. Based on the frequency of developed maturity stages (IV, V), regardingthis fish species, a year-round spawning activity has been observed, with two peaks: major one in April and a minor one in September. Comparison of Hepatosomatic index (HI) and Condition factor (Kn) with the peak spawning indicated a reverse relationship. Based on the length at first maturity (Lm50%=44cm) and capturing fisheswith the length of 44cm and above, the stretched optimum mesh size of nets was estimated to be 149.6mm. By analysis of stomach contents, fish group accounted for 35% of the groups studied, which of them, Largeheadhairtail, Trichiuruslepturus Linnaeus, constituted 52% of the total frequency. In addition to estimation of population dynamics, the exploitation rate was estimated to be E= 0.49. the length infinity (L∞), natural mortality (M), fishing mortality (F), total mortality (Z) and growth coefficient per year (K) was63.5, 0.71, 0.67, 1.38 and 0.35 respectively. The relationship between length and weight of the fish in the province determined. The parameters a, b and r (correlation coefficient) were 0.0169, 2.9821 and 0.97 respectively.

Keywords: Oman Sea, Fishing season, GSI, Mortality, Pomadasys kaakan.

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