General and specific combining ability in Serrasalmidae

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. K E Y W O R D SColossoma macropomum, diallel crossbreeding, fish breeding, Piaractus brachypomum, Piaractus mesopotamicus, round fish

Associations between morphometric variables and weight and yields carcass in PirapitingaPiaractus brachypomus

“…The linearity between the variables can be explained by the study data obtained in a single evaluation, which was the commercial weight considered for Serralmideos (Costa et al, ; Mourad et al, ). If animals were evaluated at different times or during growth, the behavior among these variables could be different.…”

Analysis of hybrid combining ability for growth and multiple stress tolerance traits in the Pacific white shrimp, Litopenaeus vannamei

“…Combining ability includes GCA (general combining ability) and SCA(Specific combining ability) (Hayman, 1957;Costa et al, 2019). GCA represents the average performance of parental lines in hybrid combinations, which is mainly improved by pure propagation; it provides information concerning the magnitude of additive genetic effects, which can be used to identify superior parents in breeding programs.…”

“…Combining ability analysis is important in studies of aquatic animal hybrid breeding, which is an important genetic improvement approach; combining ability analysis is also a prerequisite for the utilization of heterosis (Hedgecock and Davis, 2007). There have been many reports regarding combining abilities in aquatic animals (Deng et al, 2010;Bosworth and Waldbieser, 2014;Costa et al, 2019;Chaivichoo et al, 2020). Chaivichoo et al (2020) reported that the total combining ability was higher in male catfish than in female catfish 0.25 to 362.64 vs. 0.23 to 190.32, suggesting that the growth performance of a hybrid is largely dependent on additive genetic variation from its male parent, followed by variation from its female parent.…”

Convolutional Neural Networks in the Inspection of Serrasalmids (Characiformes) Fingerlings

“…Studies evaluating the effectiveness of CNNs in counting different quantities of fry are still scarce in the scientific literature, especially for round fish (Serrasalmidae; Characiformes), despite the importance of these species for aquaculture in Latin America [19,20]. Among the Serrasalmidae species, those of economic importance are pacu, pirapitinga, tambaqui, and their respective hybrids due to the nutritional and sensory characteristics of their meat, which appeal to consumers [21,22]. In view of the above, the aim of this research is to evaluate the effectiveness of counting different quantities of Serrasalmidae fry by means of images using CNNs.…”