بررسی برخی خصوصیات تولید مثلی گورماهی هرمز (Teimori, Esmaeili, Hamidan & Reichenbacher, 2018) Aphaniops hormuzensis در رودخانة مهران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه کشاورزی، دانشگاه پیام نور، تهران، ایران

2 دانش‌آموخته گروه زیست‌شناسی، دانشگاه پیام نور، تهران، ایران

10.22059/jfisheries.2023.349270.1345

چکیده

هدف از این مطالعه، بررسی برخی خصوصیات تولیدمثل گورماهی هرمز Aphaniops hormuzensis در رودخانة مهران بود. از تعداد 664 ماهی جمع‌آوری شده در طول یکسال، جنسیت 290 عدد ماهی (43/67 درصد)، جنس نر و جنسیت 374 عدد ماهی (56/32 درصد)، جنس ماده تشخیص داده شد. نسبت‌ جنسی کل (ماده به نر) به‌صورت 1: 1/28 (0/05>P) به‌دست آمد. در این مطالعه، به‌ترتیب کوچک‌ترین و بزرگ‌ترین اندازة ماهی، با طول کل 19/8 میلی‌متر و 45/7 میلی‌متر مربوط به جنس ماده بود. نوع رشد ماهیان نر و ماده به‌صورت آلومتریک منفی تشخیص داده شد. بیشترین و کمترین میزان هماوری به‌ترتیب 73 عدد تخم (مربوط به ماهی ماده با طول کل 45/7 میلی‌متر و وزن 2/3 گرم) و 4 عدد تخم (با طول کل 22 میلی‌متر و وزن 0/36گرم) شمارش شد. بیشترین میزان شاخص رسیدگی جنسی (GSI) در ماه فروردین به میزان (5/18±14/32) به‌دست آمد. این گونه توانایی تخم‌ریزی از دی‌ماه تا خرداد ماه، و در دمای آب بین 15 تا 31 درجه سانتی‌گراد را دارد. شاخص‌های رشد L، k و  t0در جنس نر به‌ترتیب 45/69 میلی‌متر، 0/73 و 1/19- و در جنس ماده به‌ترتیب 47/05 میلی‌متر، 0/72 و 1/2- برآورد شد. همچنین، مقدار آزمون فای‌پریم مونرو برای این گونه در جنس نر 3/18  و در جنس ماده 3/2 محاسبه شد. نتایج حاصل از این مطالعه می‌تواند در راستای حفاظت و مدیریت این گونه جهت حفظ تنوع زیستی مفید باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Study of some reproductive parameters of Aphaniops hormuzensis (Teimori, Esmaeili, Hamidan & Reichenbacher, 2018) in Mehran River

نویسندگان [English]

  • Mojtaba Naderi 1
  • Marziyeh Mahmoodpouran 2
  • Mostafa Alinaghizadeh 1
1 Assistant Professor, Department of Agriculture, Payame Noor University (PNU), Tehran, Iran
2 M.Sc. Graduate, Department of Biology, Payame Noor University (PNU), Tehran, Iran
چکیده [English]

The aim of this study was investigation of some reproductive traits of Aphaniops hormuzensis in the Mehran River. Of 664 recorded individuals, 290 specimens were male (43.67%), and 374 specimens were female (56.32%). The sex ratio (females/males) was 1.28:1 (P<0.05). The smallest and biggest size of fish were 19.8 mm and 45.7 mm, respectively which belonged to female. Both sexes showed negative allometric growth. Fecundity ranged from 4 (total length 22 mm, weight 0.36 g) to 73 (total length 45.7 mm, weight 2.3 g) eggs per individual. The highest value of GSI obtained in April (14.32±5.18). This fish had actively breeding during March to October with a remarkable peak in spring. Asymptotic length (L∞), growth rate (k) and t0 were 45.69 mm, 0.73 per year, and -1.19 for males, respectively and 47.05 mm, 0.72 per year and -1.2 for females. The obtained results of this study can be used for determining the strategies for further conservation and management policies of this species with the aim of preserving the biodiversity.

کلیدواژه‌ها [English]

  • Sex ratio
  • Gonado-somatic index
  • Allometric
  • Fecundity
  • Growth parameters
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