تعیین اندازه بهینه‌ چشمه در تور گوشگیر صید ماهی یال اسبی سربزرگ (Trichiurus lepturus (Linnaeus, 1758، در آب‌های استان هرمزگان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکده اکولوژی خلیج فارس و دریای عمان، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرعباس، ایران

2 ایستگاه تحقیقات نرم‌تنان خلیج‌فارس، پژوهشکدة اکولوژی خلیج‌فارس و دریای عمان، مؤسسة تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرلنگه، ایران

10.22034/AEJ.2021.317216.2697

چکیده

این پژوهش به‌منظور بهینه‌سازی چشمه تور گوشگیر صید ماهی یال اسبی در استان هرمزگان به مرحله اجرا درآمد. ابتدا روابط خطی بین طول کل با قسمت‌های مختلف بدن ماهی یال اسبی سربزرگ به‌دست آمدند. جهت بررسی کارایی و تعیین اندازه چشمه مناسب تورگوشگیر رده‌بندی ماهیان صید شده با این روش با طول بلوغ جنسی این ماهی مورد مقایسه قرار گرفت. درصد ماهیان صید شده در محل‌های مختلف به دام افتادن بررسی گردید. با استفاده از طول بلوغ جنسی این گونه و به‌دست آوردن ضریب تناسب چشمه بهینه تور گوشگیر به‌دست آمد. بیش از  57 درصد ماهیان از قسمت سر به عنوان مرتفع‌‌ترین قسمت ماهی در دام گرفتار شده بودند. نمای طولی قسمت‌های مختلف ماهی یال اسبی از جمله دور سر، دور بدن، پوزه‌گیر و تورپیچ به‌ترتیب در رده‌بندی طولی 55-50، 70-65، 70-65 و 85-80 سانتی‌متر طول کل بودند. ضریب تناسب برابر با 0/036 و چشمه داخلی بهینه (گره تا گره مقابل) برابر با 5/7 سانتی‌متر  محاسبه شد. با توجه به آن‌که بیش از 71 درصد صید ماهیان یال اسبی سربزرگ صید شده با چشمه تورهای رایج در اندازه‌های کم تر از طول بلوغ (برابر با 78/7 سانتی‌متر طول کل ) صید شده‌اند، حذف این تورها و به کارگیری تور با اندازه چشمه پیشنهادی در این پژوهش که قاعدتا باعث کاهش صید ماهیان نابالغ خواهد شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determinatio the optimum mesh size of gillnets for Largehead hairtail (Trichiurus lepturus) fishing by Hormozgan coastal waters

نویسندگان [English]

  • Mohammad Darvishi 1
  • Siamak Behzadi 1
  • Hossein Rameshi 2
  • Behnam Daghooghi 1
  • Sajjad Pourmozaffar 2
  • Mohammad Momeni 1
  • Ali Salarpouri 1
  • Gholamali Akbarzadeh Chomachaei 1
1 Persian Gulf and Oman Sea Ecology Research Institute, Iranian fisheries Science Institute, Agricultural Research, Education and Extension Organization, Bandar Abbas, Iran
2 .Persian Gulf Mollusks Research Station, Persian Gulf and Oman Sea Ecology Research Institute, Iranian fisheries Science Institute, Agricultural Research, Education and Extension Organization, Bandar-e-Lengeh, Iran
چکیده [English]

This study was performed in order to the optimization mesh size of Trichiurus lepturus´s gillnet-fishing in Hormozgan province. At first linear relationships between the total length and the different parts of the body of the Ribbonfish were obtained. In order to evaluate the efficiency and determine the appropriate mesh size, the classification of fish caught by this method was compared with the length at first maturity. The percentage of fish caught in different parts of the body was investigated. By using the length at first maturity of this species and proportion coefficient the optimal mesh size was obtained. More than 57% of the fish were caught in the head (around gill) as the highest part of body fish. The length modes of the various parts of the ribbonfish, including head (gilled), body, snout(snagged) circumference and entangled, were in the total length classifications of 50-55, 65-70, 65-70 and 80-85 cm, respectively. The proportion coefficient was equal to 0.036 and the optimal internal mesh (knot to knot opposite) was calculated to be 57 mm. Considering that more than 71% of the ribbonfish caught with common gillnets have been in sizes less than the length of maturity (78.7 cm total length), eliminating these gillnets and using the optimized mesh nets that proposed this research study,  reduces immature fish in the fishing.

کلیدواژه‌ها [English]

  • Trichiurus lepturus
  • Gillnet
  • Optimized mesh
  • Hormozgan province
  • Persian Gulf

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فصلنامه محیط زیست جانوری
دوره 14، شماره 3
آبان 1401
صفحه 229-234

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