بررسی ترکیب صید، صید دورریز، صید به ازای واحد تلاش (CPUE) و رابطه طول -وزن ماهی شوریده (Otolithes ruber, Bloch and Schneider, 1801) در تورهای گوشگیرکف در منطقه چابهار

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری تولید و بهره‌برداری آبزیان، دانشکده شیلات و محیط‌زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

2 نویسنده مسئول، دانشیار گروه تولید و بهره‌برداری آبزیان، دانشکده شیلات و محیط‌زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

3 دانشیار گروه شیلات بوم‌شناسی آبزیان، دانشکده منابع طبیعی، دانشگاه گنبدکاووس، ایران

4 استادیار گروه تولید و بهره‌برداری آبزیان، دانشگاه علوم فنون دریایی چابهار، ایران.

چکیده

مطالعه حاضر با هدف بررسی ترکیب‌ صید، میزان صید دورریز، فراوانی طولی و صید به ازای واحد تلاش تورهای گوشگیرکف مخصوص صید ماهی شوریده، با استفاده از چشمه‌های 73، 85 و 90 میلی‌متر در آب‌های دریای عمان در بازه زمانی زمستان 1398 تا اواخر بهار 1399 انجام گردید. در انجام این تحقیق 973 قطعه ماهی شامل 15 خانواده صید گردید که بالاترین میزان صید با 81/63 درصد برای ماهی شوریده به دست آمد. میزان صید دورریز 76/8 درصد محاسبه شد. میزان CPUE برای چشمه‌های مذکور به ترتیب 9/552، 9/808 و 9/456 گرم بر طاقه روز برآورد شد. با بررسی توزیع فراوانی طولی در تمامی چشمه‌ها مشخص گردید بیشترین فراوانی در طبقه طولی 36-32 سانتی‌متر با 67/43 درصد قرار دارد همچنین میانگین طولی 64/6±80/31 سانتی‌متر در کل عملیات ثبت گردید که با توجه به اولین طول بلوغ جنسی ماهی شوریده مشخص گردید تورهای گوشگیر موجود در صیدگاه‌های منطقه چابهار صیدی زیر اندازه استاندارد داشتند که به نظر می‌رسد اندازه چشمه تور باید مورد بازنگری و استانداردسازی قرار گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of catch composition, by-catch, catch per unit effort (CPUE) and length-weight relationship of the Tigertooth croaker (Otolithes ruber, Bloch and Schneider, 1801) in bottom gillnets in Chabahar region

نویسندگان [English]

  • Ali Sepahi 1
  • Saeid Gorgin 2
  • Rahman Patimar 3
  • Ali Sadough Niri 4
1 Ph.D. Student of Aquatics Production and Exploitation, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
2 Corresponding Author, Associate Prof., Dept. of Aquatics Production and Exploitation, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
3 Associate Prof., Dept. of Fisheries, Faculty of Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran.
4 Assistant Prof., Dept. of Aquatics Production and Exploitation, Faculty of Marine Sciences, Chabahar Maritime University, Sistan and Baluchistan, Iran.
چکیده [English]

The purpose of the study is to investigate the catch composition, the amount of by- catch, the length frequency and the catch per unit of effort of bottom gillnets for catching the Tigertooth croaker, using mesh size of 73, 85 and 90 mm in the waters of the Oman Sea in the period of winter 2018 to the late spring of 2019. 973 pieces of fish including 15 families were caught, and the highest catch rate was 63.81% for the Tigertooth croaker. The rate of by- catch was 8.76%. The amount of CPUE for the mentioned mesh size was estimated as 552.9, 808.9 and 456.9 grams per net day respectively. By examining the length frequency distribution in all the meshes, it was determined that the highest frequency is in the length of 32-36 cm with 43.67%. Also, an average length of 31.80±6.64 cm was recorded in the whole operation. According to the first maturity length of the Tigertooth croaker, it was determined that the bottom gillnets available in the Chabahar region fishing grounds had a catch below the standard size, and it seems the mesh size of the net should be reviewed and standardized.

کلیدواژه‌ها [English]

  • Otolithes ruber
  • Gillnet
  • By-catch
  • CPUE
  • Chabahar
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