الأتحاد الأوروبى ينجح نسبيا فى تفريخ سمك الثعبان
محمد شهاب
من أغرب أنواع الأسماك في حياتها و تكاثرها، سمكة الثعبان، فهي سمكة مياه عذبة نهرية غالبا، عند تكاثرها تحدث بها تغيرات في لون الجسم، حتى تناسب مياه البحر التي تهاجر إليها، حيت تصل كل ثعابين العالم إلى جزيرة الإنسال بالمحيط الأطلنطي، فتضع بيضها و يخصب ويفقس، و تعود الأفرخ لنفس منبت الإباء بعد رحلة طويلة.
الاتحاد الأوروبي قام بمشروع من أجل تفريخ سمك الثعبان Anguilla anguilla في محبس PRO-EEL ، و حقق نجاحا بدرجة كبيرة، و لكن لم يكمل الشوط بعد، بالآعتماد على تكنولوجيا التحفيز الهرموني، ووصلت إلى درجة اليرقات rearing larval ، ولكن لم تعيش تلك اليرقات سوى لبضعة أيام.و مازال العمل مستمرا.
Reproduction of European Eel Towards a Self-sustained Aquaculture
The PRO-EEL project aims at breeding European eel (Anguilla anguilla) in captivity. Reproduction of eel in culture has become a focus research area due a severe decline of natural stocks and an increasing interest to breed eels for a self-sustained aquaculture. PRO-EEL is an international research project supported financially by the European Commission.
The objective of the project is to expand the current knowledge on the eel reproduction and develop standardized protocols for production of high quality gametes (egg and sperm), viable embryos and feeding larvae of European eel. Methodology and technology will be established using small scale tests and validation in full scale experiments.
Focus is on the primary bottlenecks in a controlled reproduction of eels, which concern deficiencies in knowledge about their reproductive physiology and treatments applied to induce and finalise gamete development. New methods are needed for a production of viable eggs and larvae from broodstock in a regular and predictable way. Further challenges include identification of suitable larval rearing conditions and initial feed in order to establish feeding cultures of European eel larvae.
lastweek I was invited as the coordinator of LIFECYCLE to an open PRO-EEL workshop in Valencia. For a "LIFECYCLEr" it was not only nice to be able to inform the PRO-EEL project about our project, but also to learn more about the significant research effort being made in this EU project (http://www.pro-eel.eu/) towards closing the lifecyle of this important species, and thus moving from capture-based to self-sustained aquaculture.
induced maturation has been achieved by hormone treatments and live larvae have been hatched, but they survive only for a few days, suggesting the larval diet to be the next major bottleneck which needs to be solved.
يمكن متابعة اخر أخبار المزارع السمكية و السمك و الدخول فىى حوار مع افراد مجموعة (المزارع السمكية Aquacultures)على الفيس بوك :
http://www.facebook.com/groups/210540498958655/
ساحة النقاش