Growth, mortality and exploitation ratio of Thunnus tonggol (Bleeker,1851)،in the Northern of Persian gulf and Oman sea (Hormuzgan Province waters)

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Darvishi Mohammad

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Journal Paper

Paper Information

Journal: JOURNAL OF FISHERIES SCIENCE AND TECHNOLOGY (JFST) Year:2024 | Volume:13 | Issue:3 Page(s): 170-181

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Title

Growth, mortality and exploitation ratio of Thunnus tonggol (Bleeker,1851)،in the Northern of Persian gulf and Oman sea (Hormuzgan Province waters)

Author(s)

Darvishi Mohammad | Issue Writer Certificate

Keywords

Thunnus tonggol

Population dynamic

Exploitation ratio

Persian Gulf and Oman sea

Abstract

Tuna fishes are one of the most important and commericial tuna species in Northern of the Persian Gulf and Oman sea. The tuna fish stocks Thunnus tonggol was assessed in Hormuzgan coastal waters using software FiSAT . Data were collected minimum 200 fish per month simple randomly from five major traditional fish-landing sites in Hormuzgan Province, from November 2021 to September 2023. The monthly individuals ranging of T. tonggol from 21 - 108 cm fork length with mean 71.08 ± 1.23 cm.The infinity length and growth parameters (K, L∞) for T. tonggol, were computed 121.17 cm and 0.68 respectively. Growth performance index (Phi Monreo) calculated for T. tonggol , 8.9 which was in agreement with the finding of the other studies in the Indian Ocean. The results showed that this species has a high growth rate in the first 2 years of their life. The (a, b) parameters in power equation length-weight relationship for T. tonggol were (0.00002, 2.94), indicating that T. tonggol has isometric growth. Total mortality, natural mortality, fishing mortality rate and Exploitation ratio (Z, M, F, E) were estimated for T. tonggol (2.89, 0.71, 2.18, 0.75). These results indicated that population of T. tonggol is overexploited and no scope for improving production in Hormuzgan Province. Tuna fish stock are trans boundaries and its fishery management and long term monitoring programs would be conducted in collaboration countries bordering the Persian Gulf, Oman Sea and Indian Ocean

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