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Relative performance of two Nile tilapia ( O reochromis niloticus L innaeus) strains in E gypt: The A bbassa selection line and the K afr E l S heikh commercial strain
Author(s) -
Ibrahim Nabil Ahmed,
Zaid Mohamed Yahia Abou,
Khaw Hooi Ling,
ElNaggar Gamal Othman,
Ponzoni Raul W
Publication year - 2013
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2012.03240.x
Subject(s) - nile tilapia , oreochromis , biology , tilapia , strain (injury) , veterinary medicine , fish <actinopterygii> , selection (genetic algorithm) , fishery , microbiology and biotechnology , anatomy , medicine , artificial intelligence , computer science
Abstract The A bbassa selection line (developed by selective breeding) and the K afr E l S heikh commercial strain (widely used in E gypt), both O reochromis niloticus , were compared at two stocking densities (two and four fish m −2 ). Harvest weight, length, depth, width and head length were recorded. The Abbassa line showed a superior harvest weight (28 per cent) over the K afr E l S heikh strain. Males were heavier than females, but the between‐sex difference was greater in the commercial than in the A bbassa line (39 and 31 per cent respectively). Females in the A bbassa line grew almost as fast as males in the commercial line. Both strains grew faster at the lower density, and the percentage reduction in harvest weight at the higher density was about the same for both strains (27 per cent). The advantage of the A bbassa line was 28 per cent at both densities. Both strains had a similar survival rate (approximately 80 per cent) during the grow‐out period. We conclude that the A bbassa line is ready for release to the tilapia industry in E gypt. Further evidence is being sought in currently underway on‐farm evaluations. Measures should be taken to ensure the long‐term viability of the A bbassa line.