تکثیر نیمه‌مصنوعی گربه‌ماهی چوبی (Trachelyopterus fisheri) بدون مولد نر با اوالین (Ovulin)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

2 استاد گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

3 دانشیار گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

10.22059/jfisheries.2024.373236.1419

چکیده

گربه‌ماهی چوبی (Trachelyopterus fisheri) متعلق به خانوادة گربه ماهی ­های الوار، بومی آمریکای جنوبی و مورد توجه علاقه‌مندان آکواریوم است. این گونه در سال­ های اخیر به بازار ماهیان زینتی ایران معرفی و با نام تجاری پنگوسی کلمبیایی رواج یافته است. این تحقیق به معرفی زیست‌شناسی تولیدمثل این گونه در طبیعت و برای نخستین بار تکثیر منحصر به‌فرد آن در شرایط اسارت پرداخت. اوالین (Ovulin) (به‌عنوان عامل القاکنندة تکثیر) با دوز 0/5 میلی‌لیتر بر کیلوگرم به 4 مولد ماده تزریق شد. سپس به تنهایی و بدون مولد نر در مخزن تکثیر قرار داده شدند. مولدین تزریق شده تقریباً 21 ساعت پس از تزریق تخمریزی و تخم­ ها بارور شدند. حدود 22000 تخم شمارش گردید که به‌طور میانگین از هر 100 گرم مولد ماده تقریباً 5000 عدد به‌دست آمد. دلایل علمی این پدیده همراه با تعیین زمان لقاح به‌صورت مفصل مورد بررسی قرار گرفت. محاسبة دقیق میزان باروری نیز دشوار بود و تخمین زده شد که حدود 70 درصد یا پایین‌تر باشد. با توجه به نتایج بافت‌شناسی مشخص شد این گونه از نوع (Asynchronous) یا (batch spawner) است که این عامل می­تواند یکی از علت های باروری پایین باشد. نتیجة این تحقیق نشان داد که تکثیر این گونه در شرایط اسارت ممکن است و نیازی به تخم و اسپرم‌کشی و لقاح مصنوعی هم ندارد. همچنین به‌عنوان استثناء در میان غالب ماهیان زینتی و غیر زینتی، می ­توان با مولد ماده به تنهایی و بدون نر تکثیر انجام شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Semi-artificial reproduction of Driftwood catfish Trachelyopterus fisheri without male broodstock by Ovulin

نویسندگان [English]

  • Sadra Mahmoodi 1
  • Mohammad Ali Nematollahi 2
  • Soheil Eagderi 3
  • Bagher Mojazi Amiri 2
  • Mehrdad Farhangi 3
1 PhD Student, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

Driftwood catfish (Trachelyopterus fisheri) is a member of the Auchenipteridae family, native to South America and of interest to aquarium enthusiasts. In recent years, this species has been introduced to the ornamental fish market of Iran and popularized under the commercial name Colombian Pangasius. For the first time, this research has introduced the reproductive biology of this species in nature and its unique reproduction in captivity among the valid studies of Persian and English language journals. Ovulin (as a proliferation inducing agent) was injected at a dose of 0.5 ml/kg to 4 female broodstock. Then they were placed in the breeding tank alone without the male breeder. The injected broodstock spawned approximately 21 hours after injection and the eggs were fertilized. About 22,000 eggs were harvested, and on average, 5,000 eggs were obtained from every 100 grams of fertile female. The scientific reasons of this phenomenon were examined in detail along with determining the time of fertilization. Accurate calculation of fertility was difficult and estimated to be around 70% or lower. According to the histological results, it was found that this species is of the Asynchronous or batch spawning type, which can be the cause of this low fertility. The result of this research shows that, firstly, the reproduction of this species in captivity is possible without egg and sperm stripping and artificial insemination, and secondly as an exception case among the majority of ornamental and non-ornamental fishes, its reproduction can be done with females alone without any male for fertilizing the gathered eggs,

کلیدواژه‌ها [English]

  • Driftwood catfish
  • Semi-artificial reproduction
  • Ornamental fish
  • Ovulin hormone

مراجع

Anonymous https://fishbase.mnhn.fr/summary/13280
Anonymous https://fishbase.mnhn.fr/summary/Trachelyopterus-fisheri
Anonymous https://fishbase.se/summary/Poecilia-reticulata.html
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شیلات
دوره 77، شماره 3
شهریور 1403
صفحه 185-194

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