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General and specific combining ability in Serrasalmidae
Authors:Adriano Carvalho Costa,Hortê  ncia Aparecida Botelho,Richardson Cesar da Silva Gomes,Sergio Augusto de Sousa Campos,Rafael Vilhena Reis Neto,Marcio Balestre,Fernanda Dotti do Prado,Diogo Teruo Hashimoto,Diego Galetti Martins,F  bio Porto‐Foresti,M  rio Lima,Rilke Tadeu Fonseca de Freitas
Affiliation:Adriano Carvalho Costa,Hortência Aparecida Botelho,Richardson Cesar da Silva Gomes,Sergio Augusto de Sousa Campos,Rafael Vilhena Reis Neto,Marcio Balestre,Fernanda Dotti do Prado,Diogo Teruo Hashimoto,Diego Galetti Martins,Fábio Porto‐Foresti,Mário Lima,Rilke Tadeu Fonseca de Freitas
Abstract:This work was carried out to predict the combining abilities, both general and specific, for performance traits and bodily yields of Serrasalmidae. Ninety‐six 30‐day‐old juveniles were purchased from two commercial fish farms, 12 of each of the following eight genetic groups: pacu, pirapitinga, tambaqui, tambacu, tambatinga, patinga, paqui and piraqui. Six fish from each genetic group were grown in 500‐L fibreglass tanks (two tanks per genetic group) until they were 495 days old. At the end of the growth period fish were weighed, subjected to morphometric analysis and processed to obtain their bodily yields. Two nuclear markers and one mitochondrial marker were used to confirm the identity of the animals. Combining abilities were obtained using the method proposed by Griffing in 1956 (Australian Journal of Biological Science, 4, 463–493) adapted to a mixed models analysis, environmental effects were estimated by the empirical best linear unbiased estimator method and genetic effects (general and specific combining abilities) were estimated with the empirical best linear unbiased predictor. Predictions of the combining abilities of advanced hybrids were obtained by the mixed models mixture method with normal distributions. Tambaqui showed higher general and specific combining abilities than the other groups for most of the variables, making it the most important genetic group. General combining ability makes a greater contribution to phenotypic variance than specific combining ability for most variables, indicating a predominance of genes with an additive effect in the control of evaluated traits.
Keywords:   Colossoma macropomum     diallel crossbreeding  fish breeding     Piaractus brachypomum        Piaractus mesopotamicus     round fish
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