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Length frequency, length-weight relationship, and length of sexual maturity of skipjack tuna (Katsuwonus pelamis (Linnaeus, 1758)) in artisanal gillnets in the Oman Sea (Sistan and Baluchistan Province)
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Elahe Sanjarani   , Mohsen Safaie * , Ehsan Kamrani , Ali Sadough Niri |
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Abstract: (56 Views) |
In this study, length frequency, length-weight relationship and length of sexual maturity of skipjack tuna (Katsuwonus pelamis (Linnaeus, 1758)) caught by surface drift with the meshes size of 145, 165 and 197 mm gillnets in the coasts of Sistan and Baluchistan province from October 2019 to June 2020 Was investigated. The results of measuring 719 fish caught from different meshes showed that the fork length range is between 46 to 80 cm (Mean±SD 55.87±6.22 cm) and also their weight range varied between 1980 and 10820 g (Mean±SD 3811.71±1656.25 g). The lowest amount of fork length in October and the highest amount in June was obtained and the relationship between fork length and weight of K. pelamis was W= 0.0066FL3.2853 with R2 = 0.9706. Also, the results of t-test showed that there was a significant difference between the value of b number calculated with isometric growth index (b= 3) (P< 0.05) and therefore the growth of K. pelamis was determined to be positive allometric. The Lm50 index was estimated by the least squares method at 45.3 cm in the fork length. The results also showed that immature fish were not caught in all the meshes used and these meshes are unobstructed for this species.
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| Keywords: length frequency, length-weight relationship, length of sexual maturity, Katsuwonus pelamis, Oman Sea. |
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Full-Text [PDF 848 kb]
(5 Downloads)
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Type of Study: Applicable |
Subject:
Special
Received: 2022/04/27 | Accepted: 2022/09/13 | Published: 2025/06/27
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