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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 9
[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
Total Affiliations: 3
Document type: Journal article
Source: Aquaculture; v. 523, JUN 30 2020.
Web of Science Citations: 1

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)

FAPESP's process: 18/08416-5 - Low-cost genome-wide association study and genomic predictions for resistance to Aeromonas hydrophila in pacu (Piaractus mesopotamicus)
Grantee:Diogo Teruo Hashimoto
Support type: Regular Research Grants
FAPESP's process: 17/19717-3 - Genome analysis for SNPs association with resistance to Aeromonas hydrophila and fillet yield in tambaqui (Colossoma macropomum)
Grantee:Raquel Belini Ariede
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 19/10662-7 - Genome wide association study to resistance against Aeromonas hydrophila in tambaqui (Colossoma macropomum)
Grantee:Raquel Belini Ariede
Support type: Scholarships abroad - Research Internship - Doctorate