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Darvishi, Mohammad, Paighambari, Seyed Yousef, Ghorbani, Rasoul, Kaymaram, Farhad. (1397). Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province). سامانه مدیریت نشریات علمی, 17(4), 776-789. doi: 10.22092/ijfs.2018.116992
Mohammad Darvishi; Seyed Yousef Paighambari; Rasoul Ghorbani; Farhad Kaymaram. "Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province)". سامانه مدیریت نشریات علمی, 17, 4, 1397, 776-789. doi: 10.22092/ijfs.2018.116992
Darvishi, Mohammad, Paighambari, Seyed Yousef, Ghorbani, Rasoul, Kaymaram, Farhad. (1397). 'Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province)', سامانه مدیریت نشریات علمی, 17(4), pp. 776-789. doi: 10.22092/ijfs.2018.116992
Darvishi, Mohammad, Paighambari, Seyed Yousef, Ghorbani, Rasoul, Kaymaram, Farhad. Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province). سامانه مدیریت نشریات علمی, 1397; 17(4): 776-789. doi: 10.22092/ijfs.2018.116992

Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province)

Iranian Journal of Fisheries Sciences
مقاله 43، دوره 17، شماره 4، دی 2018، صفحه 776-789    اصل مقاله (742.1 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22092/ijfs.2018.116992
نویسندگان
Mohammad Darvishi؛ Seyed Yousef Paighambari* ؛ Rasoul Ghorbani1؛ Farhad Kaymaram2
1Gorgan University)
2ifro
چکیده
The purpose of this paper was to detail some important biological aspects of T. tonggol in coastal waters of Hormuzgan Province(Persian Gulf and Oman Sea). A total monthly data of 4383 individuals ranging from 25 to 124 cm fork length were collected from April 2015 to March 2016. The data were analyzed with FiSAT II software using the ELEFAN1  package  to estimate the  population parameters. The length-weight relationship was:

 TW=0.00002FL2.87(R2=0.97)and showed isometric growth for T. tonggol.

Growth parameters were computed L∞=129.6 cm, K=0.39 year-1 and t0=−0.28 with the growth performance index, φ’ of 8.7.

The total mortality(Z) estimated 1.58 year-1 using catch curve method. The natural(M) and fishing(Fcurr) mortality were obtained 0.49 year-1 and 1.09 year-1 respectively. The exploitation ratio was 0.69. Length at first capture (Lc) was estimated as 60.2 cm fork length.

   The yield per recruit (Y/R) maximized in maximum fishing mortality rate 0.85 year-1. The biomass per recruit decrease to 17.2% of unexploited biomass(Virgin biomass) at Fcurr 

The current fishing mortality exceed optimum fishing mortality(Fopt)and limit fishing mortality(Flimit)biological reference points. The results indicated that population of T. tonggol is overexploited in the Persian Gulf and Oman Sea and no scope for improving production of this species.
کلیدواژه‌ها
Thunnus tonggol(Longtail tuna)؛ Population dynamic؛ Yield and Biomass per recruit؛ Hormuzan province؛ Persian Gulf and Oman Sea
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