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Regarding to estimate the catch per unit of area (CPUA) and biomass of demersal resources in northern region of the gulf of Oman (from the Meidani (58º55'E) to Gwatre Bay (61º30'E)), a series of monitoring research cruises were carried out from 2017 up to 2019 using the R/V Ferdows-1 equipped with stern trawl. The study area divided into five stratums (M: Bayahi, Maidani, Rabach bay and Galak bay, N: Darak, Maki Sar and Tang, O: Gordim, Rashedi, Pozm and Konark), P: Konarak, Chabahar, Ramin and Kizhdaf) and Q: Beris, Pasabander and Gowatr) and each stratum was divided into four substrata on the basis of depth i.e. 10-20, 20-30, 30-50, and 50-100 m. A total of 288 stations were sampled randomly in the Oman Sea during the study period. The swept area method was used to calculate biomass and mean catch per unit area of demersal resources. Among the aquatic fish caught in the five regions from M to Q between 2017 and 2020, the biomass in region O and then in region P had the highest amount. The lowest amount of total biomass in commercial and non-commercial demersal resources was observed in the M and N stratum. The highest amount of CPUA and aboundance for all aquatic resource was observed in stratum O. In this study, the lowest mean CPUA and the lowest abundance of aquatic resource were observed in stratum Q in the easternmost part and stratum N in the central part of the Gulf of Oman (Sistan and Baluchestan Province) during the years 2017 to 2020. The highest mean CPUA of total aquatic resource was observed in the 50-100 m deep layer. The lowest value of this index was at a depth of 20-30 meters. The most abundant aquatic species in the trawl catches were Trichiurus lepturus, Carangidae, Nemipterus japonicus, Sphyraenidae, Pampus argenteus and Batoidfishes in the Oman Sea.
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