برآورد تنوع و ترکیب گونه‌ای ماهیان دورریز در صید تجاری ترال‌های میگوگیر در صیدگاه لیفه، استان خوزستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

2 دانشیار، گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

3 استاد، گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

4 دانشیار گروه شیلات، دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان 83111-84156، ایران

10.22059/jfisheries.2024.370787.1412

چکیده

مطالعة حاضر با هدف برآورد تنوع و ترکیب گونه‌ای ماهیان دورریز صید در تور ترال در منطقة لیفه در آب‌های ساحلی خوزستان صورت گرفت. داده‌ها براساس نمونه‌های حاصل از صید تجاری لنج‌های صیادی ترال دردو فصل پاییز سال 1396 و تابستان سال 1397 جمع‌آوری گردید. نتایج حاصل از این مطالعه نشان داد که نمونه‌های دورریز شامل 21 گونه از 16 خانواده‌اند. گونه‌های لچه همیلتون، شبه شوریده و پنج زاری باله نارنجی، گونه‌های غالب در این مطالعه بودند. همچنین میانگین طولی اغلب گونه‌های دورریز زیر 30 سانتی‌متر بود، به‌طوری‌که بیشترین میانگین طولی به‌دست آمده متعلق به گونة کفشک زبان گاوی با اندازة 8/3±23/3 سانتی‌متر و کمترین میانگین طولی برای گونة گیش ریز با 5/8±10/8سانتی‌متر مشاهده شد. نتایج به‌دست آمده در این مطالعه نشان داد که میزان دورریز به‌ازای واحد تلاش صیادی در فصل پاییز 0/48±8/6 و در تابستان 0/5±9/27 (کیلوگرم برساعت) است. میزان صید بر واحد سطح نیز در فصل‌های پاییز و تابستان به‌ترتیب 0/024±0/16 و 0/007±0/016 کیلوگرم بر مایل مربع به‌دست آمد. همچنین در این مطالعه درصد فراوانی گونه‌های تجاری و غیر تجاری دورریز در پاییز به‌ترتیب 22/8 و 77/3 درصد و در تابستان به‌ترتیب 7/7 و 92/3 درصد محاسبه شد. با توجه به نتایج حاصل و بالابودن نرخ دورریز در این منطقه، این امر به‌طور واضح می‌تواند اثرات منفی روی ذخایر ماهیان داشته باشد و  در آینده به صنعت صید در این منطقه آسیب وارد کند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Estimating the species diversity and abundance of discarded fish in the commercial catch of shrimp trawlers at the Lifeh fishing ground, Khuzestan province

نویسندگان [English]

  • Raziyeh Lotfi 1
  • Seyed Mehdi Hosseini 2
  • Mohammad Khosravizadeh 2
  • Vahid Yavari 3
  • Omid Beyraghdar Kashkooli 4
1 M.Sc. graduated, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
2 Associate Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
3 Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
4 Associate Professor, Department of Fisheries, Faculty of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran
چکیده [English]

The present study aimed to estimate the quantity and composition of discarded fish species in bottom trawl in the Lifeh area of the coastal waters of Khuzestan. Data were collected based on samples obtained from commercial fishing the autumn of 2017 and the summer of 2018. The results of this study indicated that the discarded samples included 21 species from 16 families. Hamilton's thryssa, Sharhosehammer croaker and Orange-fin pony fish species were predominant. Moreover, the results demonstrated that the average length of most discarded species was below 30 centimeters, with the highest average length belonging to the large scale tongues at 3.8±3.23 centimeters and the lowest for the large scale tongues at 8.5±8.10 centimeters. The findings revealed the discard rate per fishing effort unit in autumn as 4.0±6.8 kilograms per hour and in summer as 8.7±2.7 kilograms per hour. The catch per unit area was also calculated at 24.0±16.0 and 7.15±0.0 kilograms per square mile during autumn and summer, respectively. Furthermore, the percentage frequency of commercial and non-commercial discarded species in autumn was calculated as 22.74 and 77.26, respectively, and in summer as 7.7 and 3.92, respectively. Considering the obtained results and the elevated discard rate in this area, it can evidently have negative impacts on fish stocks, potentially posing risks to the fishing industry in the region in the future.

کلیدواژه‌ها [English]

  • Discards
  • Species composition
  • Catching
  • Trawl net
  • Khuzestan
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