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Population dynamics and length-based spawning potential ratio of longtail tuna (Thunnus tonggol Bleeker, 1851) in the northern waters of the Oman Sea (Coasts of Sistan and Baluchistan Province)
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Seyed Ahmadreza Hashemi1   , Mastooreh Doustdar1 |
| 1- Iranian fishery science reserch institute |
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Abstract: (462 Views) |
| In this research, population characteristics and length-based spawning potential ratio (LBSPR) of longtail tuna (Thunnus tonggol) were investigated. For this purpose, information was collected from 4 fishing grounds on the coasts of Sistan and Baluchistan Province, including Bris, Pasabandar, Pezam and Kanarak. In total, more than 700 fish were bio-measured in the research stations (catch loading areas), and the growth indices were infinite length L∞=132(cm), annual growth coefficient K=0.39, annual natural mortality M=0.61, the annual fishing mortality F=0.88, the total annual mortality Z=1.49 and the annual exploitation coefficient E=0.59 and the time of zero length to=-0.28 and the amount of growth performance index Φ'=3.84. The ratio of length-based spawning potential ratio (LBSPR) in 2022 for this species was LBSPR=0.21(0.16-0.27). This research showed that this species has medium vulnerability and medium stock status, and also the annual harvest of this species is in the stage of overfishing. |
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| Keywords: Sistan and Baluchistan Province, Longtail tuna, Demographic characteristics, Spawning potential ratio |
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Full-Text [PDF 947 kb]
(166 Downloads)
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Type of Study: Research |
Subject:
ارزيابي ذخاير و پويايي جمعيت
Received: 2024/03/25 | Accepted: 2024/06/30 | Published: 2024/08/10
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