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Coral reef fishes were studied by Under Water Visual Census Method (UWVCm), and 35 species and genus belonging to 17 families were identified in Abu Musa Island from Oct.2019 to Sep.2020 seasonally.Standing biomass is estimated 2923.6 kg., 4576.2 kg. and 1645.4 kg. for stations one, two and three respectively and total biomass is measured 9145.2kg., also confidence interval of these estimations from bootstrapping simulations(n=479) was calculated(95%). The difference in biomass and abundance of fish at the three stations could be related to the amount of reef evalution, more corals and the availability of more habitats.The maximum and minimum standing biomass belonged to the species of Yellow-tailed Surgeon (1883.49 kg) and Abudefduf sp. (0.23 kg), respectively, and the lowest frequency appropriate to Pomacanthus imperator and Abudefduf sp. With 0.002%, and the highest frequency in Chromis xanthopterygia, with 33.64% is concluded. The results of one-way analysis of variance of Tukey test at 95% confidence level do not show a significant difference between biomass at three stations (p >0.05), could be related to do not differences in the amount of developed reefs, coral ommunities and significant differences in habitat availability. could be related to do not differences in the amount of developed reefs, coral ommunities and significant differences in habitat availability.The results of similarity test and non-metric multidimensional scaling analyzes, comparing the composition and diversity of fish species of three stations, show that the composition and diversity of fish species in station 3, with a similarity level of 60%, are different from the other two stations, also in assessment the composition and diversity of fish species, it was concluded that the samples from all four seasons are close to each other. The percentage of ecological similarity of species shows that coral fish are distinguished from each other in the level of different similarities. Keywords: Standing biomass, Coral reef fishes, UWVCm, non-metric multidimensional scaling analyzes,Abu Musa, Persian Gulf.
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