Polygenetic relationship and growth performance for different populations of Nile tilapia, Oreochromis niloticus under polyculture system
Abstract: Four local populations of Nile tilapia (Oreochromis niloticus) were collected from different locations in Egypt namely, Abbassa, Maryout, Manzala and Aswan. Protein banding patterns (SDS-PAGE) for all populations were performed using soluble fraction of muscle extract. The variation among and between populations were estimated and compared. The intra-specific variation for SDS-PAGE was low for both Abbassa and Manzala and high for Maryout and Aswan. The results generated from protein analysis were pooled for drawing the genetic relationships among the four examined populations. The phylogenetic tree indicated that Maryout and Manzala form one group that branched to the subgroup of Abbassa, which branched in turn to another subgroup of Aswan population. The four populations of Nile tilapia, Oreochromis niloticus were evaluated under polyculture system (120 days) in earthen ponds. The growth performance and survival rate were determined. The result indicates highly final weight (188g); total yield (371.23 * 9.59 kg / feddan) and daily weight gain (1.28* 0.017 g/fish/day) in Maryout population followed by Manzala (1.261*0.01 g/fish/day), then Abbassa (1.22* 0.01 g/fish/day). While, the lowest final weight (165 g); total yield (301.69*24.127 kg / feddan) and daily weight gain (1.16*0.095 g/fish/day) on Aswan population. These differences in average individual daily weight gain may be due to genotype. On the other hand, we showed that increased survival rate on Maryout population (94 * 1.28 %) and decreased in Manzala population (83.4 * 1.92 %). We may conclude that the Maryout population is expected to perform better under polyculture system in earthen ponds.
Publication year 2004
Pages 11-30
Organization Name
Country Egypt
serial title مجلة الأكاديمية المصرية لتنمية البيئة
Volume 5 . 1
Department Breeding and Genetics
Author(s) from ARC
Agris Categories Animal genetics and breedingFisheries production
AGROVOC
TERMS		 Egypt. Electrophoresis. Oreochromis niloticus. Phylogeny. Polyculture (aquaculture). Proteins. Weight gain.
Publication Type Journal
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