بیولوژی تولیدمثل ماهی مرکب بزرگ (Sepia pharaonis, Ehrenberg, 1831) در آب‌‌های شمالی خلیج فارس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکترای تخصصی، مسئول تحقیقات زیستی میگو، پژوهشکده میگوی کشور، بوشهر، ایران

2 کارشناس ارشد، رئیس بخش ارزیابی ذخایر، پژوهشکده میگوی کشور، بوشهر، ایران

3 کارشناس ارشد، بخش ارزیابی ذخایر، پژوهشکده میگوی کشور، بوشهر، ایران.

4 دکترای تخصصی، معاونت تحقیقاتی، پژوهشکده میگوی کشور، بوشهر، ایران

چکیده

هدف پژوهش:هدف این تحقیق بررسی وضعیت و شیوه‌های مدیریت صید ماهی مرکب در آب‌های شمالی خلیج فارس براساس چرخه تولیدمثل آبزی و صید همزمان آن و ارائه راه‌حلی در راستای مدیریت بهینه جهت حفاظت و استمرار صیادی در منطقه می‌باشد.
مواد و روش‌ها:نمونه‌برداری از گرگور شناورهای صیادی در مناطق تخلیه صید بوشهر و خوزستان انجام گرفت. تعداد 100 تا 150 نمونه به شکل تصادفی از مجموعه صید جدا شد. پس از تفکیک نمونه‌ها براساس جنسیت، وضعیت تولیدمثلی در دو جنس نر و ماده با استفاده از شاخص گنادی و محاسبات آماری مورد مطالعه قرار گرفت.
یافته‌ها:نتایج شاخص‌های اندم جنسی نر و ماده (GSI) نشان‌دهنده بیشترین فعالیت باروری در اسفند ماه است و پس از آن روند تولیدمثل در هر دو جنس رو به کاهش بود. بیشترین تعداد تخمک در گروه‌های طولی 21 تا 26 سانتی متری و کم‌ترین تعداد در گروه طولی 15 تا 16 سانتی متری می‌باشد. نسبت جنسی کل در طول دوره مورد بررسی برابر با 2/1 بوده و نتایج آماری اختلاف معنی‌داری را نشان می‌دهند (05/0<p). همچنین زمان آزادی صید ماهی مرکب بزرگ در منطقه مورد بررسی همزمان با اوج تخم‌ریزی آبزی می‌‌باشد. با توجه به نتایج حاصل از این تحقیق نیاز به تدوین مدیریت جدیدی در بهره‌برداری از این آبزی است.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Reproductive Biology of Giant Cuttlefish (Sepia pharaonis, Ehrenberg, 1831) in the Northern Waters of the Persian Gulf

نویسندگان [English]

  • Nassir Niamaimandi 1
  • Ali Mobarrezi 2
  • Gholam Moradi 3
  • Khosrow Aeinjamshid 4
1 PhD. Head of shrimp biology research section, Iran Shrimp Research Center, Bushehr, Iran
2 M.S. Head of stock assessment division, Iran Shrimp Research Center, Bushehr, Iran.
3 M.S. Stock assessment expert, Iran Shrimp Research Center, Bushehr, Iran
4 PhD. Research deputy, Iran Shrimp Research Center, Bushehr, Iran
چکیده [English]

Objectives: The aim of the study was to investigate the management of simultaneous catch season and spawning period of giant cuttlefish and determine a new solution for optimal management for conservation and continuity of fisheries in the region.
Materials and Methods: Samples were collected from the catches of traditional gear of traps at landing places of Bushehr and Khuzestan. 100 to 150 samples were randomly selected and sorted by sex. Reproductive status in males and females were studied using gonadosomatic index (GSI) and statistical calculations.
Results: The result of GSI in males and females indicated the highest reproductive activity in February and March, and then reproductive activities were reduced in both sexes. Sex ratio was ½ and Chi-squared (X2) tests gave for both sexes, indicating that the ratio of males to females was significantly different (p> 0.5). The results of present study show that opening period of the giant cuttlefish in the studied area is simultaneous with maximum spawning period of the species. Based on the results of the present study, it is necessary to develop a new management for exploitation of the giant cuttlefish in the area.
 
 

کلیدواژه‌ها [English]

  • Reproductive biology
  • Sepia pharaonis
  • Bushehr and Khuzestan
  • Persian Gulf
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