ارزیابی وضعیت بهره‌برداری و برآورد شاخص‌های طولی جهت مدیریت صید میگوی سرتیز (Metapenaeus affinis) با استفاده از مدل LBB در آب‌های شمال غربی خلیج فارس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

2 استادیار گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

3 استادیار گروه تولید و بهره‌برداری، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

10.22059/jfisheries.2023.353197.1359

چکیده

از لحاظ میزان صید، میگوی سرتیز (Metapenaeus affinis) رتبة اول را در آب‌های استان خوزستان به‌خود اختصاص می‌دهد که امرار معاش و اقتصاد جوامع صیادان محلی این استان به آن وابسته است. بدین‌منظور در این مطالعه از مدل LBB به‌عنوان یک راهکار جدید و قوی مبتنی بر داده‌های طول جهت تعیین وضعیت بهره‌‌برداری و به‌دست آوردن شاخص ­های طولی برای مدیریت صید میگوی سفید سرتیز در آب‌های ساحلی استان خوزستان طی سال 1400 استفاده شد. با توجه به برآورد B/BMSY ذخیرة میگوی سرتیز برابر با 1/3 بیانگر آن است که ذخیرة این میگو در وضعیت نسبتاً سالم، اما در مرز صید بی‌رویه قرار دارد. مقادیر F/M (نقطة مرجع کمتر از 1) و B/B0 (نقطة مرجع 0/5-0/4) نیز این مورد را تأیید می‌کنند. مقدار B/B0 برابر با 0/47 تخمین زده شد که بیانگر آن است که میزان نرخ تخلیه از ذخیره 53 درصد بوده است. همچنین نسبت‌های F/M، M/K،  F/Kو Z/K به‌ترتیب برابر 0/65، 1/7، 1/11 و 2/81 برآورد شدند. مقادیر طول در اولین صید (Lc)، طول بهینه در اولین صید (Lc-opt) و طول بهینة صید (Lopt) براساس طول کاراپاس به‌ترتیب 24/13، 24/0 و 30/0 میلی‌متر به‌دست آمد. در این مطالعه نسبت Lc/Lc-opt بزرگتر از 1 و شاخص‌های Lmax5%/Linf یاL95%/Linf  بزرگتر یا تقریباً برابر با 0/8 محاسبه شد. با این حال مقادیر نسبت‌هایLmean/Lopt  و Lmean/LF=M تقریباً کمتر از 1 به‌دست آمد که نشان داد که برداشت بهینه انجام نمی‌شود. بنابراین با توجه به یافته ­های این تحقیق، اگرچه ذخیرة میگوی سفید سرتیز در وضعیت سالمی قرار دارد اما برای داشتن حداکثر زیست‌تودة کوهورت و جلوگیری از بهره‌برداری بی رویة این گونه در دراز مدت باید رویکرد مناسب مدیریتی براساس شاخص ­های مهم طولی اتخاذ گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of exploitation status and estimation of length indicators for the management of the Jinga shrimp (Metapenaeus affinis) fishery using the LBB model in the northwestern waters of the Persian Gulf

نویسندگان [English]

  • Roghayeh Alvani 1
  • Mohammad Khosravizadeh 2
  • Parviz Zare 3
1 M.Sc. student, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
2 Assistant Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
3 Assistant Professor, Fishing and Exploitation Department, College of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

In terms of catch, Jinga shrimp (Metapenaeus affinis) occupies the first place in the waters of Khuzestan province, and the livelihood and economy of the local fishing community of this province depend on that. To this end, this study used LBB model as a new and powerful method based on length data to obtain length indicators for management of Jinga shrimp fishery in coastal waters of Khuzestan province in 2021. The estimated B/BMSY value of Jinga shrimp stock of 1.3 indicates that the stock of these shrimp is in a relatively healthy condition but is on the verge of overfishing. The values of F/M (reference value below 1) and B/B0 (reference value 0.4-0.5) also confirm this. The B/B0 value was estimated to be 0.47, which means that the exploitation rate of the stock is 53%. The ratios M/K, F/K and Z/K were also estimated to be 0.65, 1.7, 1.11 and 2.81, respectively. The results related to the length in the first catch (Lc), the optimal length in the first catch (Lc-opt) and the optimal length of the catch (Lopt) showed that their values were 13.24, 0.24 and 0.30 mm, respectively. In this study, the ratio of Lc/Lc-opt was greater than 1, and the indices Lmax5%/Linf and L95%/Linf were calculated with values greater than or equal to 0.8, respectively. However, the ratios of Lmean/Lopt and Lmean/ LF=M were almost less than 1, showing that the harvest is not optimal. According to the results of this study, although the stock of Jinga shrimp is healthy, in order to ensure the maximum biomass of the cohort and prevent overfishing of Jinga shrimp in the long term, a proper management approach should be adopted based on the important length indicators.

کلیدواژه‌ها [English]

  • Jinga shrimp
  • LBB model
  • Exploitation status
  • optimal catch
  • Coastal waters of Khuzestan
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