EFFECT OF TRIPLOIDY INDUCTION ON MATURATION AND GROWTH TRAITS OF NILE TILAPIA, OREOCHROMIS NILOTICUS

Document Type : Original Article

Authors

1 Department of Animal Production, Faculty of Agriculture at Moshtohor, Zagazig University Banha Branch).

2 Central Laboratory for Aquaculture Research at Abbassa, Agriculture. Research Center.

3 Institute of Animal Husbandry and Genetics, University of Gottingen, Germany

Abstract

An experiment was conducted during 7 months period to test performance of triploidy including growth, sexual maturation, carcass and chemical analysis of 0. niloticus. Triploid 0. niloticus had heavier and longer bodies than diploids from 3 to 7 months of age, and the differences were not significant except for body length. This trend was also observed for condition factors, daily gain and specific growth rate. Feed conversion ratios were better for triploids at some
studied ages. In triploid of both sexes, the values of Gonado-somatic indices (GSI) were smaller than diploids with significant differences between the two ploidy sex groups. Hepato-somatic indices (HIS) of triploid 0. niloticus males were larger than that of diploid with significant differences between the two groups. However HIS of triploid females
were smaller than that of diploid females but the differences were insignificant. Carcass traits of triploid 0. niloticus showed higher percentages of dressing, viscera, by-products and lower percentages of flesh as compared with that obtained from the diploid. Chemical analysis of flesh indicated that protein, fat and ash percentages in triploid flesh were higher than in diploids, while the opposite trend was obtained with respect to moisture percentages.
Triploid fish had the higher percentages of fat and ash and lower percentage of crude protein and moisture in its by-products with significant differences for moisture only  

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