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The Effect of different Water Salinities on Growth of Blue tilapia (Oreochromis aureus) Broodstock

تأثير درجات الملوحة المختلفة في نمو أمهات أسماك المشط الأزرق Oreochromis aureus

1974   2   30   0 ( 0 )
 Publication date 2013
and research's language is العربية
 Created by Shamra Editor




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The broodstock of Blue tilapia (Oreochromis aureus) were reared in glass aquaria in the laboratory of the High Institute of Marine Research to study the effect of different water salinities on growth rates of those broodstocks and comparing the results with those obtained from the natural environment (freshwater). The broodstock were transported from El-Sin Fish Farm- Banias to the culture aquaria at the beginning of April (2011). After acclimation to the three studied water salinities (7‰, 14‰ and 19 ‰) in three aquaria (the forth aquarium was left as a control: fresh water), the fish were fed on a diet containing 35 % protein till satiation, twice a day for 72 days. The results revealed that the broodstock reared at 14‰ Salinity produced the best weight gain, where the weight gain was 18.76 g/fish with a feed conversion rate (FC) of 2.04. The weight gain was 17.16 g/fish for the fish reared at 7‰ with a FC= 2.51, while broodstock reared at fresh water gained 14.63g/fish with a FC= 2.97. The worst weight gain was obtained from the broodstock reared at 19‰ (9.24 g/fish) with a FC= 3.7.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تأثير درجات الملوحة المختلفة على نمو أمهات أسماك المشط الأزرق (Oreochromis aureus). تم تربية الأمهات في أحواض زجاجية في المعهد العالي للبحوث البحرية، حيث تم تقسيمها إلى أربع مجموعات: ثلاث مجموعات بدرجات ملوحة مختلفة (7%، 14%، 19%) ومجموعة رابعة في مياه عذبة كحوض شاهد. تم تغذية الأسماك بعليقة تحتوي على 35% بروتين خام لمدة 72 يومًا. أظهرت النتائج أن الأسماك التي تربت في درجة ملوحة 14% حققت أفضل معدلات نمو بوزن 18.76 غرام لكل سمكة ومعامل تحويل غذائي 2.04، بينما كانت الأسماك في درجة ملوحة 19% الأقل نموًا بوزن 9.24 غرام ومعامل تحويل غذائي 3.7. تشير الدراسة إلى أن تربية أسماك المشط الأزرق في المياه شبه المالحة يمكن أن تكون بديلاً فعالاً لتوفير المياه العذبة وتحقيق نمو أفضل للأسماك.
Critical review
دراسة نقدية: تعتبر هذه الدراسة خطوة مهمة في مجال تربية الأسماك في المياه شبه المالحة، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن توسيع نطاق الدراسة ليشمل أنواع أخرى من الأسماك لتقديم نتائج أكثر شمولية. ثانياً، لم يتم التطرق بشكل كافٍ إلى التأثيرات البيئية المحتملة لتربية الأسماك في المياه شبه المالحة. وأخيراً، كان من الممكن تحسين تصميم التجربة بإضافة مجموعات إضافية بدرجات ملوحة مختلفة بين 14% و19% للحصول على نتائج أكثر دقة.
Questions related to the research
  1. ما هي أفضل درجة ملوحة لنمو أمهات أسماك المشط الأزرق حسب الدراسة؟

    أفضل درجة ملوحة لنمو أمهات أسماك المشط الأزرق هي 14%، حيث حققت الأسماك في هذه الدرجة أفضل معدلات نمو بوزن 18.76 غرام لكل سمكة ومعامل تحويل غذائي 2.04.

  2. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي من هذه الدراسة هو دراسة تأثير درجات الملوحة المختلفة على نمو أمهات أسماك المشط الأزرق وتحديد أفضل درجة ملوحة لتحقيق نمو أفضل.

  3. كيف تم نقل أمهات أسماك المشط الأزرق إلى أحواض التجربة؟

    تم نقل أمهات أسماك المشط الأزرق من مزرعة أسماك مصب السن في بانياس إلى أحواض التجربة باستخدام أكياس نايلون مملوءة بمياه من نفس الحوض ومحقونة بالأكسجين.

  4. ما هي التوصيات التي قدمتها الدراسة؟

    توصي الدراسة بتربية أسماك المشط الأزرق في المياه شبه المالحة لما لهذه التربية من فوائد على صعيد النمو وتوفير المياه العذبة للاستخدامات البشرية الأخرى، كما توصي بمتابعة الدراسة على أنواع أخرى من أسماك المشط لاكتشاف مدى قدرتها على التأقلم والنمو تحت درجات ملوحة مختلفة.


References used
BALARIN, J.D; Haller, R.D. The intensive culture of tilapia in tanks, raceways and cages. In: Muir, J.F; Roberts, R.J. (eds.) Recent Advances in Aquaculture. Croom Helm, London and Canberra, and West view Press, Boulder, Colorado, 1982, 267– 355
BOLIVAR, R.B., EKNATH, A.E., BOLIVAR, H.L; ABELLA, T.A. Growth and reproduction in individually tagged Nile tilapia (Oreochromis niloticus) of different strains. Aquaculture, 111, 1993,159-169
CHERVINSKI, J. Environmental physiology of tilapias. In: PULLIN, R.V.S; LOWE-MCCONNELL, R.H. (eds.) The Biology and Culture of Tilapias. ICLARM Conference Proceedings No. 7, ICLARM, Manila, Philippines, 1982, 119–128
DE MOOR, I.J. & M.N. BRUTON. Atlas of alien and translocated indigenous aquatic animals in southern Africa. A report of the Committee for Nature Conservation research National Program for Ecosystem Research. South African Scientific Programs Report No. 144, 1988, 310
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