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Population indices and length-based spawning potential ratio (LBSPR) of Skipjack tuna (Katsuwonus pelamis Linnaeus, 1758) in the northern waters of the Oman Sea (Coasts of Sistan and Baluchestan Province)
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Seyed Ahmad Reza Hashemi *   , Mastooreh Doustdar2 , Parastoo Mohebi derakhsh2 |
Offshore Fisheries Research Center, Iranian Fisheries Science and Research Institute, Agricultural Research Education and Extension Organization, Chabahar, Iran., Offshore Fisheries Research Center, Iranian Fisheries Science and Research Institute, Agricultural Research Education and Extension Organization, Chabahar, Iran. , Seyedahmad91@gmail.com
2- Iranian Fisheries Science and Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran. |
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Abstract: (304 Views) |
In this research, population characteristics and length-based spawning potential ratio (LBSPR) of skipjack tuna (Katsuwonus pelamis) were investigated. For this purpose, information was collected from 4 fishing areas on the coasts of Sistan and Baluchistan province, including Bris, Pasabandar, Pozam and Kanarak. In total, more than three thousand fish were bio-measured in the research stations, and the growth indices were infinite length L∞ = 92(cm), annual growth coefficient K = 0.68, annual natural mortality 0.7 = M, the annual fishing mortality F=0.37, the total annual mortality Z=1.07 and the annual exploitation coefficient E=0.35 and the time of zero length to=-0.17 and the amount of growth performance index Φ'=3.76. The ratio of length-based spawning potential ratio (LBSPR) in 2022 for this species was LBSPR=0.42 (0.38-0.45). This research showed that this species has medium vulnerability and medium stock status, and also the annual harvesting rate of this species is lower than overfishing.
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| Keywords: Skipjack tuna, Sistan and Baluchestan Province, Demographic characteristics, Spawning potential ratio. |
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Full-Text [PDF 539 kb]
(102 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/11/4 | Accepted: 2024/01/3 | Published: 2024/06/30
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