Survey of spatial-temporal distribution pattern and genetic structure of Amblygaster sirm (Walbaum, 1792) in Persian Gulf and Oman Sea (Coast of the Hormozgan and Busher Provinces)

Fish sardines play a key role in the primary chain of production in the sea, and unknowing harvesting of them causes irreparable damage to the marine ecosystem. Also, genetic studies can help preserve biodiversity and take steps to protect the reserves. In this research, the population dynamic of the Amblygaster sirm and it,s the maximum sustainable yield (MSY) were surveyed and calculated and finally, genetic markers were used to evaluate its genetic diversity. This study was conducted in the Persian Gulf and the Oman Sea (Hormozgan and Busher Provinces) in Bandar-e-Lengeh to the Jask ports. Sampling was carried out monthly during 2014-2015. The results showed that fish has negative almeteric growth pattern and infinity fork length was 11.29, and growth coefficient of 1.4/year, natural mortality was high (M=2.3 ind/year) and exploitation rate was 0.49, biomass and MSY were evaluated 43.3 and 41.3 tons. The genetic results showed that samples of A.sirm in the Delvar area (Bushehr) were completely isolated from other samples of other areas. Samples of the Bostane and Garze stations are more similar to each other, and samples of the Delvar station are far more than them.  In general, due to the high natural mortality of A.sirm, it seems that the fish catch ration is in suitable situation.