بررسی ترکیب صید، فراوانی طولی، تلاش صیادی و پراکنش نرم‌تن مرکب ببری (Sepia pharaonis) صید شده توسط گرگور در مناطق صیادی رمین و کنارک، استان سیستان و بلوچستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد بوم‌شناسی دریا، دانشگاه دریانوردی و علوم دریای چابهار، چابهار، ایران

2 دانشیار گروه زیست‌شناسی دریا، دانشگاه دریانوردی و علوم دریای چابهار، چابهار، ایران

3 دکتری شیلات تکثیر و پرورش آبزیان، سازمان شیلات ایران، چابهار، ایران

چکیده

این مطالعه با هدف بررسی ترکیب صید، فراوانی طولی، تلاش صیادی و پراکنش نرم‌تن مرکب ببری (Sepia pharaonis) صید شده توسط گرگور در مناطق صیادی رمین و کنارک سیستان و بلوچستان انجام شد. در اعماق 20 تا 40 متری منطقه صیادی رمین طی ماه‌های مهر، آبان، آذر و دی 1400 تعداد 387 و کنارک 368 نمونه صید شد. در منطقه رمین، بیشترین تعداد (129 عدد) و دامنه‌های طولی (6/40-3/17 سانتی‌متر) و وزنی (5/3847-3/367 گرم) در دی ماه بود. بیشترین تعداد نمونه صید شده به گروه طولی 2/27-8/24 سانتی­متر (54 عدد) و کمترین به گروه 2/42-8/39 سانتی­متر (2 عدد) تعلق داشت. در منطقه کنارک، بیشترین تعداد در دی ماه (113 عدد) و بیشترین دامنه‌های طولی (2/41-2/18 سانتی­متر) و وزنی (24/3886-17/426 گرم) در مهر ماه مشاهده شد. بیشترین تعداد نرم‌تن صید شده به گروه طولی 32-3/29 سانتی‌متر (49 عدد) و کمترین به گروه 4/42-9/39 سانتی­متر (6 عدد) تعلق داشت. در منطقه رمین 14 گونه در مهر، 11 گونه آبان، 14 گونه آذر و 16 گونه در دی ماه صید شد. همچنین در منطقه کنارک 16 گونه در مهر، 15 گونه آبان، 13 گونه آذر و 16 گونه در دی ماه صید شد. مقادیر شاخص‌های a، b و R2 در رابطه طول و وزن به ترتیب در مناطق رمین 2085/0، 6422/2 و 9791/0 و کنارک 17038/0، 6962/2 و 9842/0 بود. مقایسه ماهانه مقادیر CPUE دو منطقه نشان داد بیشترین مقادیر در دی ماه و کمترین در مهر ماه بود. این نتایج می‌تواند به درک بهتر وضعیت جمعیت نرم‌تن مرکب ببری دو منطقه صیادی و وضعیت اکوسیستم‌‌های مورد مطالعه کمک کند.

کلیدواژه‌ها

موضوعات


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