Feeding ecology of Rhabdosargus haffara Frosska, 1775, in north of the Persian Gulf and Oman Sea (Hormuzgan province Waters) the

Some of feeding ecology and diet habitat of Rhabdosargus haffara is estimated in Northern of the Persian of Oman Sea (Hormuzgan province). For this purpose, 561 (220 male& 341 female) were selected. Consumption per biomass rate, Trophic level and Aspect ratio of caudal fin were calculated 14.3, 3.33±0.46 and 3.66 respectively, for the R.haffara for the first time in the north of Persian Gulf and Oman sea. A.Rc.f of demersal fish have been reported a small amount, Furthermore trophic level is shown that R.haffara have carnivorous diet. Vacuity index in this study was 66.54, also, maximum of prey occurrence index was concluded in the seasons (40.74) and the year (28.66) for bivalves. The results of ANOVA showed similarity in the frequency of prey in the difference length classes, but two of the length classes (22-24 and 30-32) had the most of prey, Also Length classes from 12-14 to 20- 22 and 32-34 had done specially in selected prey groups. Minimum and maximum of GaSI index is determined in summer of 2015 and winter of 2016. The finding of this study could be used in aquaculture and ecological modeling.