Occurence of Phytoplankton in Stomach Content and Its Selectivity by Nile Tilapia (Oreochromis niloticus L.) Cultured in Fertilized Earthen Ponds

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Occurence of Phytoplankton in Stomach Content and Its Selectivity by Nile Tilapia (Oreochromis niloticus L.) Cultured in Fertilized Earthen Ponds

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dc.contributor.author Abdel Tawwab, Mohsen [محسن عبد التواب] en_US
dc.date.accessioned 2009-11-25T15:34:27Z
dc.date.available 2009-11-25T15:34:27Z
dc.date.issued 2003 en_US
dc.identifier.citation Qatar University Science Journal, 2003, Vol. 23, Pages 153-166. en_US
dc.identifier.uri http://hdl.handle.net/10576/10353
dc.description.abstract Nile tilapia (Oreochromis niloticus L.) was cultured in earthen ponds receiving 0, 20, 40, 60 and 100 kg/feddan/month of inorganic fertilizer (20:20:5 N:P:K). The obtained results showed that the composition percentage of food items in stomachs of Nile tilapia was ranked as phytoplankton> detritus> zooplankton at all fish sizes. Zooplankton did not exceed 1.5% of total stomach's contents. The main algal species found in fish stomach belonged to Cyanobacteria, Chlorophyta, Bacillariophyta and Euglenophyta. Detritus consisted mainly of scraps of macrophytes and mud, and its contribution to gut content decreased for increasing fish size, while phytoplankton contribution increased. Bacillariophyta represented the main phytoplanktonic division at small fish size (30-60 g/fish), while Chlorophyta is the dominant group at large fish size (60-70 g/fish). The most frequently genera represented in fish stomach in all treatments were Anabaena, Merismopedia, Microcystis, Nodularia and Oscillatoria (Cyanobacteria), Cerasterias, Chlorella, Crucigenia, Pediastrum, Scenedesmus and Tetraedron (Chlorophyta), Amphora, Cocconeis, Cymatopleura, Cymbella, Gyrosigma, Melosira, Navicula, Nitzschia, Pinnularia, Serurella and Synedra (Bacillariophyta) and Euglena and Phacus (Euglenophyta). Results revealed that Nile tilapia could select Cyanobacteria during the investigation period and sometimes select Bacillariophyta and Euglenophyta. en_US
dc.description.abstract أجرى هذا البحث بنرض دواسة التواجد الطحلبى فى معدات البكطى النيلى تحت تأت!ر كميات مخننفة من النشميد غير العضوى فى أحواض سمكية ترابية . أظهرت نتائج فحص المحتوى الغذائى لمعدات سمك البكطى النيلى أنه يتغكت ى بشكل وئيسى على الهائمات النباتية (الفيتوبالإنكتون ) ثم المواد العضوية المتحككة (detrotus) بينما كانت الهائمات الحيوانية (الزووبالإنكتون ) قكيلة ولا تزيد عن %1.5 من المحتوئ الكلى لمعدات السمك التى فحصت طوال فنزة التجربة وعند كل الأحجام . اختكفت نسبة تواجد . ar
dc.language.iso en en_US
dc.publisher Qatar University en_US
dc.subject Biological Science en_US
dc.subject بيولوجيا ar
dc.title Occurence of Phytoplankton in Stomach Content and Its Selectivity by Nile Tilapia (Oreochromis niloticus L.) Cultured in Fertilized Earthen Ponds en_US
dc.title.alternative التواجد اطحلبى فى معدات البلطى النيلى المستزرع فى أحواض ترابية مسمدة ar
dc.type Article en_US
dc.identifier.pagination 153-166 en_US
dc.identifier.volume 23 en_US

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