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Population biology and assessment of Kawakawa (Euthynnus affinis) in Coastal Waters of the Persian Gulf and Sea of Oman (Hormozgan Province) | ||
| Iranian Journal of Fisheries Sciences | ||
| مقاله 11، دوره 9، شماره 2، مرداد 2010، صفحه 315-326 اصل مقاله (297.77 K) | ||
| شناسه دیجیتال (DOI): 10.22092/ijfs.2018.114076 | ||
| نویسندگان | ||
| S. A. Taghavi Motlagh* ؛ S. A. Hashemi؛ P. Kochanian | ||
| چکیده | ||
| Length composition data (fork length) of kawakawa (Euthynnus affinis ), landed between April 2003 to March 2005 in Coastal Waters of Hormozgan province in Iran ( Persian Gulf and Sea of Oman) , were monthly used to estimate the p opulation parameters and for the assessment of the stock. The growth parameters of von Bertalanffy equation were estimated as L∞: 87.66 cm, K: 0.51 per year and t0: -0.23 year. The estimated value of total mortality, natural mortality and fishing mortality were Z: 2.37, M: 0.65, F: 1.72 per year, respectively. Exploitation ratio (E) and Exploitation rate (U) were estimated as 0.72 and 0.65. The Annual total stock at beginning of year was calculated to be 7924 t and Annual average standing stock (S) was equal to 2994 t. By using analyses knife-edge selection method, biological reference points for kawakawa stock was calculated as, Y'/R (relative yield per recruitment) =0.062, B'/R (relative biomass per recruitment) =0.13, F max (Fishing mortality at maximum sustainable yield) =1.6, E max (Exploitation ratio at maximum sustainable yield) = 0.68 Fopt (Precautionary average target ) =0.33 year-1 and Flimit=0.43 year-1. As the exploitation ratio of kawakawa stock in this study was calculated to be over 0.5, it strongly recommended minimizing the fishing activity in this area. | ||
| کلیدواژه‌ها | ||
| Euthynnus affinis؛ Population biology؛ Assessment؛ Persian Gulf؛ Oman Sea | ||
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