دراسة بيولوجية لأفراد النوع 1820 Daphnia magna Straus من القشريات متفرعات قرون الاستشعار(Cladocera – Daphniidae) تحت تأثير الشروط المختبرية.
Abstract
جُمعت عينات القشري برغوث الماء العذب 1820 Daphnia magna Straus من أحد المصادر المائية العذبة القريبة ( سد بكسا - اللاذقية )، فضلاً عن عينات من منطقة الهبيط التابعة لمحافظة إدلب.
تمت أقلمة هذه الكائنات لفترة محددة في المخبر قبل إجراء الدراسات البيولوجية عليها . ثم بعد ذلك أجريت العديد من التجارب المختبرية تتضمن دراسة تطورها, و سرعة نموها الطولي والوزني، وتكاثرها وخصوبتها ومدة حياة الإناث البكرية في شروط مغذية مختلفة .
بدأت التجارب من 01 / 4 / 2008 ولغاية22 / 7 /2008 بهدف تحديد شروط الأوساط المغذية المثلى لاستزراع أفراد النوع D. magna بوصفه غذاءً حياً ليرقات وصغار الأسماك الاقتصادية.
بينت التجارب أن سرعة النمو الطولي والوزني متباينة تبعاً لتركيز الأوساط المغذية، كما سجلت القيم العظمى لهذه السرعة من زمن الفقس حتى مرحلة النضج الجنسي.
وتبين من النتائج أيضاً أن أفضل الأوساط المغذية لاستزراع أفراد هذا النوع تحت الشروط المختبرية كان في وسط خليط من الطحالب الخضراء.
The specimens of Daphnia magna Straus 1820 have been collected from the nearest freshwater reservoir (BAKSSA - Lattakia) in addition to specimens collected from a freshwater pond (AL- Habeet area – Idleb).
The organisms under investigation have been acclimatized to laboratory-testing conditions before proper biological studies have been made.
Afterwards, a number of experiments have been conducted concerning the speed of its longitudinal and weight growth, egg production, and the total life span of female parthenogenesis under various nutritional conditions.
Experiments have started from 1/04/2008 through 22/07/2008 in order to define the best nutritional conditions to cultivate D. magna as food for fish organisms.
The experiments showed that the rate of the longitudinal and weight growth is varied according to nutritional concentration media. It was also observed that the speed of growth reaches its utmost from hatching till adulthood.
It has also been noticed that the best nutritional media to cultivate D. magna under experimental conditions were found to be a mixture of green algae.
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.