Seasonal variation in chemical composition of the black pomfret (parastromateus niger) from ratnagiri coast, maharashtra state, india

The chemical composition variations of the Black pomfret (Parastromateus niger) from Ratnagiri coast were investigated seasonally over the period of three year (2008-2011). Protein in female muscle from Sakhri-Natye is recorded 20.155±0.309 within PFZ while from outside PFZ is 19.278±0.309 as compared to male during November-December. On the other hand in March-April from female muscle is noticed 21.032±0.404 for within PFZ than outside PFZ is 21.167±0.710 as compared to other two fish landing centers. Glycogen level in female liver from Harnai within PFZ is 16.097±0.170 whereas from outside is 15.104±0.214 when validation experiment compared to all the males during November-December. From female liver value is noticed 16.550±0.214 from within PFZ, as for outside PFZ 16.153±0.298 as compared to male. Lipid level from female gonad Harnai region 8.813±0.612 for within PFZ as for outside value is 7.108±0.371, while for Mirkarwada for within PFZ male gonad the value is observed 7.758±0.486, for outside is 7.190±0.506 during November-December. In March-April from within PFZ for female gonad Harnai value is 10.03±0.782, for outside PFZ is 8.894±0.612, whereas from male gonad from Mirkarwada within PFZ region is 9.056±0.371, while for outside PFZ is 7.758±0.486 as compared to other landing centers during March-April respectively. The Black pomfret fishes caught in both within and outside PFZ areas were in the size range of 25- 32cm. On the whole of it all observations made through within and outside PFZ realm it was concluded that most of the females attain first maturity at 28-32 cm whereas the males at 25-30 cm.