Abstract
Selection can affect growth, changing performance and asymptotic values. However, there is little information about the growth of families in fish breeding programs. The aim of this study was to evaluate the performance and growth of families of Nile tilapia AquaAmérica. Twenty AquaAmérica families cultivated in a net cage (13.5 m3) for 181 days were evaluated. The nonlinear Gompertz regression model was fitted to the data by the weighted least squares method, taking the inverse of the variance of weight in different families and at different ages as the weighting variable. The model was adjusted to describe the growth in weight and morphometric characteristics. Two families showed highest (P<0.05) weights at both 133 days (family AA10: 743.2 g; family AA16: 741.2 g) and 181 days (family AA10: 1,422.1 g; family AA16: 1,393.4 g) of the experiment. In both experimental periods, the males showed a heavier weight, with the greatest contrast between the sexes occurring at 181 days. The analysis of the three most contrasting families (AA1, AA9 and AA14) showed that the asymptotic value for weight was higher (P<0.05) in family AA9 (3,926.3 g) than in family AA14 (3,251.6 g), but specific growth rate and age at the inflection point did not differ significantly between families. In conclusion, two of the 20 families were superior; males exhibited a greater growth, mainly in the period of 181 days; and the growth curve differed between the families, especially for asymptotic weight.
Highlights
Nile tilapia (Orechromis niloticus) was the third most farmed aquaculture species in the world in 2017 (FAO, 2020), and the first most cultivated species in Brazil in 2019, which placed the country as the world’s fourth largest producer of the species (Peixe BR, 2020)
This study proposes to examine the performance and growth curves of Nile tilapia from different families of the AquaAmérica variety
The Nile tilapia AquaAmérica variety was created in Brazil in 2012, from the GIFT variety previously crossed with the Chitralada and Bouaké varieties, which were introduced in 1996 and 1971, respectively (Oliveira et al, 2016; Garcia et al, 2017)
Summary
Nile tilapia (Orechromis niloticus) was the third most farmed aquaculture species in the world in 2017 (FAO, 2020), and the first most cultivated species in Brazil in 2019, which placed the country as the world’s fourth largest producer of the species (Peixe BR, 2020). The GIFT (Genetically Improved Farmed Tilapia) variety was subsequently introduced in 2005 (30 families), which were imported by the State University of Maringá (UEM), located in Maringá - PR, in partnership with the World Fish Center (Garcia et al, 2017). This variety originated from the crossing of four wild African varieties (Ghana, Egypt, Kenya and Senegal) to four domesticated Asian varieties (Israel, Singapore, Taiwan and Thailand) (Eknath et al, 2007). This variety was developed from families of GIFT and crossed with the Chitralala and Bouaké varieties, introduced in 1996 and 1971, respectively (Garcia et al, 2017)
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