Genetic (co)variation between resistance to Aeromonas hydrophila and growth in tambaqui (Colossoma macropomum)

Autor(es)

Ariede, Raquel B. ^[1] ; Freitas, V, Milena ; Agudelo, John F. G. ^[2] ; Borges, Carolina H. S. ^[2] ; Lira, Lieschen V. G. ^[2] ; Yoshida, Grazyella M. ^[3] ; Pilarski, Fabiana ^[2] ; Yanez, Jose M. ^[3] ; Hashimoto, Diogo T. ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Aquaculture Ctr Unesp, BR-14884900 Jaboticabal, SP - Brazil

^[2] Freitas, Milena, V, Sao Paulo State Univ Unesp, Aquaculture Ctr Unesp, BR-14884900 Jaboticabal, SP - Brazil

^[3] Univ Chile, Fac Ciencias Vet & Pecuarias, Santiago - Chile

• Tipo de documento: Artigo Científico
• Fonte: Aquaculture; v. 523, JUN 30 2020.
• Citações Web of Science: 1

Resumo

Tambaqui (Colossoma macropomum) is the main native fish farmed in South American continental aquaculture. One of the major pathogens affecting world fresh water aquaculture is the bacterium Aeromonas hydrophila, which generates several disease outbreaks and production losses in farmed tambaqui stocks. Up to date, there are no studies focusing on understanding the quantitative basis for the genetic improvement for disease resistance in tambaqui. Thus, the objective of this study was to determine the genetic parameters for resistance to A. hydrophila and the genetic correlation with average daily gain in juveniles of tambaqui, to determine whether these traits can be included in selective breeding programs. Estimation of genetic parameters was performed using data from an experimental challenge performed in 18 full-sib families, using a total of 576 individuals. Before bacterial challenge, all animals were evaluated for average daily gain (ADG) in the juvenile phase during 30 days. The challenge spanned 120 h (5 days) and disease resistance traits were defined as: i) binary survival (BS) and, ii) time of death (TD) of fish presenting clinical signs of A. hydrophila infection. The mean ADG was 0.49 g/day (SD = 0.21) in the population and heritability for this trait was moderate (h(2) = 0.37 +/- 0.13). BS and TD varied considerably among families (26% to 89% and 10.7 h to 69.2 h, respectively), which indicated a significant genetic variation related to resistance to A. hydrophila infection. Low to moderate values for heritability were found for BS and TD (0.17 +/- 0.06 and 0.23 +/- 0.09, respectively). The genetic correlations between resistance to A. hydrophila and ADG in juveniles of tambaqui were not significantly different from zero. The significant genetic variation found for A. hydrophila resistance in tambaqui indicates that selecting superior genotypes is a viable approach to reducing the impact of diseases outbreaks in aquaculture. (AU)

• Processo FAPESP: 18/08416-5 - Estudo de associação genômica ampla de baixo custo e predições genômicas para resistência a Aeromonas hydrophila em pacu (Piaractus mesopotamicus)
• Beneficiário: Diogo Teruo Hashimoto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/19717-3 - Análises genômicas para associação de SNPs com resistência a Aeromonas hydrophila e rendimento de filé no tambaqui (Colossoma macropomum)
• Beneficiário: Raquel Belini Ariede
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/10662-7 - Estudo de associação genômica ampla para resistência a Aeromonas hydrophila em tambaqui (Colossoma macropomum)
• Beneficiário: Raquel Belini Ariede
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado