Diet And Feeding Ecology Of Nile Tilapia Oreochromis Niloticus And Nile Perch Lates Niloticus In Protected And Unprotected Areas Of Lake Victoria Tanzania
Journal: International Journal of Scientific & Technology Research (Vol.3, No. 11)Publication Date: 2014-11-15
Authors : Ngwala James Jihulya;
Page : 280-286
Keywords : Keywords Detritus; Caridina nilotica; Haplochromis spp; Stomach contents; Lates niloticus; Orechromis niloticus; Phytoplanktons.;
Abstract
Abstract Diet and feeding ecology of O. niloticus and L. niloticus in Rubondo Island National Park RINP an area protected from fishing and Kome Island KI an area unprotected from fishing activities in Lake Victoria were compared. Important food items of O. niloticus and L. niloticus both in RINP and KI areas did not differ. Main food items of O. niloticus were detritus remains of water hyacinth and phytoplanktons. Phytoplanktons in O. niloticus stomachs were from five classes of Cynanophyceae Basillariophyceae Chrolophyceae Dinophyceae and Euglenophyceae. Class Cyanophyceae had the highest number of occurrences than any of the phytoplankton observed in the stomachs of O. niloticus. The percentages of occurrences were 65.96 24.2 9.61 0.01 and 0.01 for Cyanophyta Chlophyta Diatom Euglenophyta and Dinophyta respectively. High indices of relative importance IRI of haplchromine fishes in L. niloticus stomachs in both areas show that L. niloticus has returned to its original food of haplochromine fishes as it was during its upsurge in Lake Victoria. The indices of relative importance IRI of haplochromine fishes for L. niloticus in KI and RINP areas were 95.3 and 87.3 for KI and RINP areas respectively. The second important prey was Caridina nilotica with indices of relative importance of 1.2 and 12.7 for KI and RINP areas respectively. Insects were important food of juvenile L. niloticus. Cannibalism of L. niloticus occurred in both areas.
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