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ABDEL-TAWWAB, M. (2000). OCCURRENCE AND COMPOSITION OF PHYTOPLANKTON IN STOMACHS OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) CULTURED IN PONDS RECEIVED INORGANIC FERTILIZERS. Egyptian Journal of Agricultural Research, 78(3), 1363-1375. doi: 10.21608/ejar.2000.323914
MOHSEN ABDEL-TAWWAB. "OCCURRENCE AND COMPOSITION OF PHYTOPLANKTON IN STOMACHS OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) CULTURED IN PONDS RECEIVED INORGANIC FERTILIZERS". Egyptian Journal of Agricultural Research, 78, 3, 2000, 1363-1375. doi: 10.21608/ejar.2000.323914
ABDEL-TAWWAB, M. (2000). 'OCCURRENCE AND COMPOSITION OF PHYTOPLANKTON IN STOMACHS OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) CULTURED IN PONDS RECEIVED INORGANIC FERTILIZERS', Egyptian Journal of Agricultural Research, 78(3), pp. 1363-1375. doi: 10.21608/ejar.2000.323914
ABDEL-TAWWAB, M. OCCURRENCE AND COMPOSITION OF PHYTOPLANKTON IN STOMACHS OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) CULTURED IN PONDS RECEIVED INORGANIC FERTILIZERS. Egyptian Journal of Agricultural Research, 2000; 78(3): 1363-1375. doi: 10.21608/ejar.2000.323914

OCCURRENCE AND COMPOSITION OF PHYTOPLANKTON IN STOMACHS OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) CULTURED IN PONDS RECEIVED INORGANIC FERTILIZERS

Article 31, Volume 78, Issue 3, September 2000, Page 1363-1375  XML PDF (3.08 MB)
Document Type: Original Article
DOI: 10.21608/ejar.2000.323914
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Author
MOHSEN ABDEL-TAWWAB
Central Laboratory for Aquaculture, Agricultural Research Centre, Ministry of Agriculture, Giza, Egypt
Abstract
Occurrence and composition of phytoplankton in stomachs of Nile tilapia (Oreochromis niloticus L.) in ponds received inorganic fertiliz­er (20:20:5 N:P:K) at different doses were studied. The doses were 0, 20, 40, 60 and 100 kg/feddan/month. It was found that, O.niloticus consume phytoplankton, detritus and zooplankton with different compo­sition. The main items found in fish stomach were phytoplankton and detritus. Zooplankton was occasionally found and not exceeding 1.5% of total stomach contents. The main species of algae found in fish stom­ach belonged to Cyanophyta, Chlorophyta, Bacillariophyta and Eugleno­phyta. Detritus consisted mainly of scraps of macrophytes and mud. The most frequently species represented in fish stomach in all treatments were Anabaena sp, Merismopedia eleganse, Microcystis aeruginose, No­dularia harveyana and Oscillatoria sp (Cyanophyta). Cerasterias sp. Chlo­rella spp, Crucigenia sp, Pediastrum spp., Scenedesmus spp. and Tetra­edron sp. (Chlorophyta), Amphora ovalis, Cocconeis placentula, Cymatopleura solsa, Cymbella cistula, Gyrosigma attenuatum, Melosira granulate, Navicula spp., Nitzschia spp. Pinnularia spp.. Serurella sp. and Synedra sp. (Bacillariophyta) and Eug/ena and Phacus spp. (Euglenophy­I a). Results revealed that, O.niloticus could select Cyanophyta during the investigation period and sometimes select Bacillariophyta and argle­nophyta.
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