Morphometric measurements and phenotypic correlations of the tilapia Gift (Oreochromis niloticus) after individual selection
Keywords:
Oreochromis niloticus, individual selecton, morphological parameters, phenotypic correlatonsAbstract
This study aimed to evaluate the effect of individual selection for body weight on morphometric characteristics of the Nile tilapia, Gift-Epagri strain, and as well as to determine the phenotypic correlations of these measurements. We used 325 males and 272 females derived from seven different populations of the breeding program. The following morphometric characteristics were measured: body weight (BW), total length (TL), standard length (SL), corrected length (CL), head length (HL), body height (BH) and body width (BW). Thereafter, the data were used to determine the following ratios: Fulton condition factor (FC), HL/SL, BH/SL, BW/SL and CL/SL. Fish selected for body weight showed greater FC and BH/SL compared to unselected fish. In addition, all correlations between variables were high (above 0.70), indicating that the selection of individuals with higher body weight may provide indirect gains in other desirable characteristics.
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