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Investigating the growth, mortality and maturity size of Thryssa vitrirostris (Gilchrist and Thompson, 1908)
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Najmeh Haghighatjou *   , Rahman Patimar , Saeed Gorgin , Rasoul Ghorbani , ٍEric Gilman , Reza Abbaspour Naderi , Hadi Raeisi , Shokrollah Farrukhbin |
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Abstract: (137 Views) |
This study aimed to investigate the growth and mortality parameters rates and the reproductive biology of T. vitrirostris on Hormozgan inshore waters (the northern Persian Gulf). 1211 specimens were selected by Stake-Nets, shrimp trawling fisheries, Trichiuridae in Qeshm Island located in the Persian Gulf during January 2010 to December 2010. 260 specimens was obtained to determine the sex ratio. growth parameters obtained from otolith ageing and length frequency analyses with FISAT and ELEFAN1method agreed well. The minimum and maximum length of the fish specimens were calculated 2/3 cm and 24.4 cm and length-weight 0.2g and 78.8 g, respectively. The a value of the length-weight relationship was obtained 0.0047 and for b was 3.121 that showed positive allometric growth. Estimated Von Bertalanffy growth parameter values were (L∞ = 23.42 cm, K = 0.62 and t0 = -0.279 year) and (L∞ = 25.12 cm, K = 0.41 and t0 = -0.421 year) for male and female, respectively. Also infinity weights (W) were estimated nearly to 17.563. The annual total mortality, fishing mortality, and natural mortality coefficients were estimated 2.138, 1.118 and 3.256 per year, respectively. Also, the exploitation coefficient 0.656 was obtained, which indicates that the stock was not overexploited.
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| Keywords: T. vitrirostris, growth, mortality, trawl, Hormozgan province |
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Full-Text [PDF 1454 kb]
(49 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/08/1 | Accepted: 2025/06/27 | Published: 2025/06/27
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