A Study on Cohort and Recruitment pattern of Thunnus tonggol (Bleeker,1851) in Hormozgan waters

Scombridae and Thunnus tonggol is one of the most commercial family species in the Persian Gulf and Oman Sea. In order to come up with the responsible fishing pattern, there was a need information about cohort and recruitment pattern data were collected simple randomly from five major artisanal fish-landing sites included, Bandar Jask, Bandar Sirik, Bandar Abbas, Bandar Kong and Bandar Parsian, from April 2015 to March 2016. Cohorts (based on Bhattacharya's method), and recruitment pattern were determined by using FiSAT II software. The fork length individuals ranged from 22 to 132 cm. There was a significant difference among  monthly averages of lengths  fish caught. The mean of individuals in period of study was 70.87 cm. Fishes were separated in 2 to 6 class during the year. Recruitment pattern were seen in all month of year but with only peak. The maximum recruitment pattern were in July then August with 16.6 and 15.62% respectively. The rercorded results showed that the responsible fishing pattern, there was a need to fishing manage  of this species.