دراسة مدى تحمل أصبعيات المشط الأزرق (Tilapia aurea) للتربية في درجات ملوحة مختلفة
Abstract
لقد تم تربية إصبعيات المشط الأزرق في درجات ملوحة مختلفة (0.5، 5، 10، 15، 20، 26، 32، 38 ‰) ضمن أحواض زجاجية سعتها 100ليتر. غذيت الإصبعيات على علف اصطناعي يحوي 35% بروتين وطاقة بمعدل 500 كح/100 غ عليقة بمعدل مرتين يومياً حتى الشبع لمدة شهر واحد.
أوضحت النتائج أن الإصبعيات المرباة في المياه العذبة أعطت أفضل معدلات نمو وأحسن كفاءة تحويل الغذاء. حدثت اختلافات جوهريه في النمو و كفاءة تحويل الغذاء بالانتقال إلى ملوحة 5 و‰10 (P<0.05) مع ملاحظة أنّ النتائج التي حصلنا عليها عند هاتين الدرجتين كان من الممكن مقارنتها و مقاربتها مع اصبعيّات المياه العذبة المستعملة كشاهد. هذّه الاختلافات كانت مؤكدة و جوهريّة (P<0.05) عند الاصبعيّات المرباة في درجات الملوحة الأعلى .(‰20 ,15) أما معدلات النمو وكفاءة تحويل الغذاء الأقل فقد حصلنا عليها من الاصبعيّات المرباة في الملوحة . (‰32 ,26) وقد نفقت جميع الاصبعيات عند الدرجة 38‰ و ذلك خلال يومين إلى ثلاثة من الأقلمة.
Tilapia aurea fingerlings were reared at different water salinities (0.5, 5, 10, 15, 20, 26, 32 and 38‰) in 100 liters glass aquaria. The fish were on an artificial diet that included protein (35%) and 500 kcal/100g feed; it was provided twice a day to satiation for 30 days. The results revealed that the best growth rates and the best feed conversion were obtained from fish reared in 0.5‰. Significant differences (P<0.05) were noticed by moving to fish reared at 5 and 10‰, but still accepted compared to those reared in the control fresh water. These differences were significant (P<0.05) by moving to fish reared at 15, 20‰. The lowest growth rates and the least feed conversion were noticed in fish reared at 26 and
32 ‰. All fingerlings at 38‰ died within two to three days after their acclimation.
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to the Tishreen University Journal for Research and Scientific Studies - Biological Sciences Series
Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in Tishreen University Journal for Research and Scientific Studies - Biological Sciences Series . The Readers have the right to send, print and subscribe to the initial version of the article, and the title of Tishreen University Journal for Research and Scientific Studies - Biological Sciences Series Publisher
journal uses a CC BY-NC-SA license which mean
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.