Volume 15, Issue 1 (Spring 2025)
J. Aqua. Eco 2025, 15(1): 1-11 |
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zare P, Gorgin S, Erfanifar E. Study on length frequency distribution of Largehead hairtail (Trichiurus lepturus, Linnaeus, 1758) caught by J-style hooks in Coastal Waters of Konarak (Oman Sea). J. Aqua. Eco 2025; 15 (1) :1-11
URL: http://jae.hormozgan.ac.ir/article-1-1136-en.html
URL: http://jae.hormozgan.ac.ir/article-1-1136-en.html
Abstract: (163 Views)
This study investigated the length-frequency distribution of Largehead Hairtail (Trichiurus lepturus) caught using three hook sizes (No. 6, 7, and 8) in the coastal waters of Konarak, northern Gulf of Oman. Sampling was conducted from early autumn 2022 to late spring 2023. A total of 645, 1,027, and 430 specimens were collected using hooks No. 8, 7, and 6, respectively, and subjected to biometric analysis. The total length ranges of fish captured were 60–124 cm (mean: 85.6 cm) with hook No. 6, 53–127 cm (mean: 80.3 cm) with hook No. 7, and 54–121 cm (mean: 81.4 cm) with hook No. 8.Results showed that the mean length of fish caught with hook No. 6 was significantly greater than those caught with hooks No. 7 and 8. However, considerable overlap was observed in the length-frequency distributions across all hook sizes, indicating that larger hooks do not completely prevent the capture of undersized individuals. The Kolmogorov-Smirnov test found no significant difference in length distributions between hooks No. 7 and 8, but a significant difference was observed when comparing these to hook No. 6. Based on the sexual maturity length index, the proportion of undersized fish caught was 5.6% for hook No. 6, 18.0% for hook No. 7, and 18.2% for hook No. 8. These findings suggest that using larger hooks—particularly No. 6—can enhance selectivity and reduce the capture of immature individuals, contributing to the sustainable management of T. lepturus populations. The study provides a basis for fisheries management strategies aimed at conserving this economically valuable species in the Persian Gulf and Oman Sea.
Keywords: Largehead hairtail, Hoke and line, Sustainable management, Length frequency, Size-selectivity.
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