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Improving growth, omega-3 contents, and disease resistance of Asian seabass: status of a 20-year family-based breeding program
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Improving growth, omega-3 contents, and disease resistance of Asian seabass: status of a 20-year family-based breeding program
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Improving growth, omega-3 contents, and disease resistance of Asian seabass: status of a 20-year family-based breeding program
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Journal Article
Improving growth, omega-3 contents, and disease resistance of Asian seabass: status of a 20-year family-based breeding program
2024
Overview
Aquaculture has been one of the fastest-growing sectors in agriculture and plays an important role in supplying high quality proteins for humans. Genetic improvement for important traits is essential for increasing aquaculture production. The aquaculture of Asian seabass (Lates calcarifer) has become important in Southeast Asia and Australia and has expanded to other countries. In Singapore, a breeding program was initiated in 2004, aimed at improving growth rates, high omega-3 content, and disease resistance within Asian seabass populations. Many genomic resources have been developed to achieve these goals. The breeding program was established with a broodstock of 549 broodfish collected from the wilds of Indonesia, Thailand, Malaysia, and Singapore. Through four generations of family-based selection, utilizing a combination of conventional selective breeding, molecular parentage analysis, marker-assisted selection, and genomic selection techniques, three distinct elite lines of Asian seabass were successfully established. Each line consisted of approximately 200 broodfish. These lines were selected for growth, higher omega-3 content, and disease resistance, respectively. These traits have been improved without dramatically reducing genetic variation. This review provides a comprehensive overview of the methodologies adopted and status of the genetic improvement of the above-mentioned traits. Concurrently, certain gaps in the existing body of research have been identified. In the future, additional traits related to the ability to use feeds with reduced fishmeal, as well as adaptation to climate change and resistance against emerging diseases should be included in the breeding program.
