تغییرات توده زنده سپرماهیان در خلیج عمان و دلایلی برای مدیریت.

Global concern over the overfishing of elasmobranches is well known, with an increasing number of studies in various regions of the world. The Gulf of Oman, like other ecosystems, the increasing fishing fleet and fisheries are considered important factors affecting aquatic resources. This study aimed to assess CPUA and biomass of batoidfishes and also biomass variation in the Gulf of Oman during two last decades. Sampling was carried from October to January using research bottom trawler of “FERDOWS1”, into 8 strata from Bandar Abbas (strata J) to marine border of Pakistan (strata Q). Overall, 1743 samples of batoidfishes belonging to 15 species and 10 families were recorded. The results appeared minimum and maximum CPUA in strata L and P with 1651.5 and 34.7 kg, respectively. Also, minimum and maximum biomass were found in strata L (1341.7 tonnes) and N (16.1 tonnes). Examining the trend of changes in CPUA and biomass from 2004 to 2017 showed that, with the exception of strata L, there were decreasing trend in all other strata. The results of the present study make it clear that after the apex predators, the meso-predators are also under threat, and the future of the Gulf of Oman ecosystem and the stability of the food web require proper management for the sustainable preservation of resources of the food web. [ABSTRACT FROM AUTHOR]