Research Article: Population dynamics and fishery status of Trichiurus lepturus (Largehead hairtail) in the northern waters of the Oman Sea (Sistan and Baluchestan waters, Iran)

Population dynamics and fishery status of Trichiurus lepturus were estimated by landings data on the northern waters of the sea of Oman (Sistan and Baluchestan Province, Iran). A total of more than ۳۰۰۰ fish samples were weighted and measured during one-year study period (October ۲۰۱۶ to September ۲۰۱۷), the growth indices were obtained as follow: L∞=۱۷۶ cm, K=۰.۵ (yr -۱), to=-۰.۲ year, M=۰.۶۷(yr -۱), F=۳.۵۲ (yr -۱), Z=۴.۱۹ (yr -۱), and E=۰.۸۵, respectively. Exploitation rate (U), ۰.۵۳, annual total stock at the beginning of the year (Bv), ۳۲۲۶۴ t, Annual average standing stock (B), ۴۸۲۷ t, Maximum Constant Yield (MCY),۱۰۲۶۰ t, maximum sustainable yield (MSY),۱۵۳۹۰ t, fishing mortality rate that maximizes equilibrium yield per recruit, Fmax: ۰.۸ and Exploitation ratio maximum sustainable yield, Emsy: ۰.۵۴ were calculated for this species. Results of this study showed exploitation ratio of the Largehead hairtail stock is overfishing and decreasing of exploitation rate proposed.

Keywords:

Largehead hairtail , Catch trend , Exploitation rate , Oman Sea