نوع مقاله : مقاله کامل علمی - پژوهشی
نویسندگان
1 دانشجوی مقطع کارشناسی ارشد، رشته صید و بهرهبرداری آبزیان، گروه شیلات، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی چابهار،
2 استادیار گروه شیلات، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی چابهار، چابهار، ایران
3 شیلات، تولید و بهره برداری، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In recent years, the encircling gillnet fishing method has attracted the attention of Chabahar fishers due to its higher catch of target species and greater total yield compared to conventional gillnets. The present study aimed to investigate the catch composition, length frequency, illegal catch, catch per unit effort (CPUE), and the effects of environmental factors on the catches of encircling gillnets in the Chabahar fishing grounds. A total of 817 fish specimens were caught using encircling gillnets. The results indicated that the highest catch belonged to yellowfin tuna (Thunnus albacares; Bonnaterre, 1788), comprising 42.23% of the total catch, while the lowest catch corresponded to yellowtail barracuda (Sphyraena jello; Cuvier, 1829) at 8.08%. Analysis of the length frequency of the captured fish revealed the following mean lengths (± SD): yellowfin tuna (Thunnus albacares; Bonnaterre, 1788), 72.42 ± 6.31 cm; common hoover (Thunnus tonggol; Bleeker, 1851), 52.74 ± 5.18 cm; blacktail barracuda (Sphyraena putnamae; Jordan & Seale, 1905), 53.21 ± 6.16 cm; kingfish (Scomberomorus commerson; Lacepede, 1800), 83.25 ± 4.27 cm; and yellowtail barracuda (Sphyraena jello; Cuvier, 1829), 85.32 ± 3.29 cm. Additionally, the results showed that neither season nor temperature had a significant effect on the CPUE of encircling gillnets, whereas depth had a direct influence on their catch rates. Based on the findings, the performance of encircling gillnets in terms of catch efficiency was deemed satisfactory, and with proper mesh size regulation, these nets could be effectively utilized in the region.
کلیدواژهها [English]