Abstract
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.
Highlights
This study sought to evaluate the effect of individual selection for body weight on morphometric characteristics of the Nile tilapia (GIFT-Epagri strain), and to determine the phenotypic correlations of these measurements
This study sought to evaluate the effect of individual selection for body weight on the morphometric characteristics of Nile tilapia (GIFT O. niloticus, Epagri strain) from the Epagri breeding program, as well as to determine the phenotypic correlations of these measurements
The families of tilapia, GIFT strain from Universidade Estadual de Maringá (UEM), were divided among seven different populations according to their origin
Summary
This study sought to evaluate the effect of individual selection for body weight on morphometric characteristics of the Nile tilapia (GIFT-Epagri strain), and to determine the phenotypic correlations of these measurements. This study sought to evaluate the effect of individual selection for body weight on the morphometric characteristics of Nile tilapia (GIFT O. niloticus, Epagri strain) from the Epagri breeding program, as well as to determine the phenotypic correlations of these measurements. 240 days post-hatch the fish were weighed individually for the selection of animals that had the highest body weight (BW) (60 females and 40 males per population).
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