hashemi, S., Erfanifar, E., Rahimi, Q. (2021). Demographic characteristics of Longtail tuna (Thunnus tonggol Bleeker, 1851) in the Persian Gulf and Oman Sea (Hormozgan province). , 5(1), 51-62.
seyed ahmad reza hashemi; Elnaz Erfanifar; Qasem Rahimi. "Demographic characteristics of Longtail tuna (Thunnus tonggol Bleeker, 1851) in the Persian Gulf and Oman Sea (Hormozgan province)". , 5, 1, 2021, 51-62.
hashemi, S., Erfanifar, E., Rahimi, Q. (2021). 'Demographic characteristics of Longtail tuna (Thunnus tonggol Bleeker, 1851) in the Persian Gulf and Oman Sea (Hormozgan province)', , 5(1), pp. 51-62.
hashemi, S., Erfanifar, E., Rahimi, Q. Demographic characteristics of Longtail tuna (Thunnus tonggol Bleeker, 1851) in the Persian Gulf and Oman Sea (Hormozgan province). , 2021; 5(1): 51-62.

Demographic characteristics of Longtail tuna (Thunnus tonggol Bleeker, 1851) in the Persian Gulf and Oman Sea (Hormozgan province)

دو فصلنامه ماهیان دریایی
Article 6, Volume 5, Issue 1, September 2021, Pages 51-62    PDF (967.33 K)
Document Type: مقاله ترویجی
Authors
seyed ahmad reza hashemi* 1; Elnaz Erfanifar2; Qasem Rahimi2
1Offshore fisheries research center(chabahar), Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization.
2Offshore Fisheries Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization, Chabahar, Iran.
Abstract
In this research, trend catch and demographic characteristics and demographic characteristics of Longtail tuna (T.tonggol) were estimated by collecting information from 4 catchment areas on the coast of Hormozgan province including Kang, Salakh, Parsian and Jask. In this project, more than 14000 fish at the research stations were biometric and the growth parameters were infinite length of L∞ = 137 cm, growth factor K = 0.41 (yr-1), natural mortality M= 0.63(yr-1), mortality and mortality (yr-1), F = 0.49, total mortality (yr-1), Z = 1.12 ± 0.16 and exploitation coefficient (yr-1), E = 0.43, and the time zero was -0.26 for the years. Relative production per recruitment, relative biomass per recruitment, exploitation rate and average annual standing stock for kawakawa species were estimated Y '/ Rp =0.03, B' / Rp = 0.36, U= 0.38, respectively. This study showed that this species has moderate vulnerability and medium stock conditions, and also, exploitation ratio of this species stock is under fishing.
Keywords
Longtail tuna; Exploitation coefficient; demographic characteristics
References
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