Fish Domestication: An Overview

Teletchea, Fabrice

doi:10.5772/intechopen.79628

Cited by 21 publications

(12 citation statements)

References 82 publications

(248 reference statements)

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“…Domestication is the process of constant evolutionary and genetic changes in response to captivity 10 . Nile tilapia can be considered to have reached the level of true domestication (level 5), according to the five categories of the domestication process 11,12 . This process may have shaped the genetic diversity of Nile tilapia, leaving signatures in their genomes that can be traced.…”

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confidence: 99%

Whole genome re-sequencing reveals recent signatures of selection in three strains of farmed Nile tilapia (Oreochromis niloticus)

Cádiz

López

Díaz-Domínguez

et al. 2020

Sci Rep

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Nile tilapia belongs to the second most cultivated group of fish in the world, mainly because of its favorable characteristics for production. Genetic improvement programs and domestication process of Nile tilapia may have modified the genome through selective pressure, leaving signals that can be detected at the molecular level. In this work, signatures of selection were identified using genomewide SNP data, by two haplotype-based (iHS and Rsb) and one F ST based method. Whole-genome re-sequencing of 326 individuals from three strains (A, B and C) of farmed tilapia maintained in Brazil and Costa Rica was carried out using Illumina HiSeq 2500 technology. After applying conventional SNP-calling and quality-control filters, ~ 1.3 M high-quality SNPs were inferred and used as input for the iHS, Rsb and F ST based methods. We detected several candidate genes putatively subjected to selection in each strain. A considerable number of these genes are associated with growth (e.g. NCAPG, KLF3, TBC1D1, TTN), early development (e.g. FGFR3, PFKFB3), and immunity traits (e.g. NLRC3, PIGR, MAP1S). These candidate genes represent putative genomic landmarks that could be associated to traits of biological and commercial interest in farmed nile tilapia. Nile tilapia (Oreochromis niloticus) is a teleost fish of the Cichlidae family native to Africa and the Middle East. The geographic range of the species extends from 8°N to 32°N 1. The first record of domestication is dated around 3,500 years ago as evidenced in paintings at the Theban tombs in Egypt 2. Nowadays, this species is the second most cultivated group of fish in the world 3. Favorable characteristics for production include rapid growth, adaptability to different culture conditions, tolerance to high densities, disease resistance, easy reproduction, and tolerance to low concentrations of oxygen 4. Genetic improvement programs (GIPs) for Nile tilapia began in 1988 as an approach to counteract the production decrease generated by introgressions with Mozambique tilapia (Oreochromis mossambicus) 5,6. Since then, nearly twenty GIPs have been established for Nile tilapia around the world 7,8. GIPs aim to improve traits of commercial interest, such as growth rate, disease resistance, cold and salinity tolerance 7. The GIFT (Genetic Improvement of Farmed Tilapia) 9 Nile tilapia strain was developed by the ICLARM (International Centre for Living Aquatic Resources Management, now the WorldFish Center), in collaboration with the Norwegian Institute of Aquaculture Research (AKVAFORSK, now NOFIMA Marin) 1. The implementation of GIPs for the GIFT population has been successful, because growth rate in Nile tilapia has doubled in five generations, showing that this species had a positive response to selection 1 .

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confidence: 99%

Whole genome re-sequencing reveals recent signatures of selection in three strains of farmed Nile tilapia (Oreochromis niloticus)

Cádiz

López

Díaz-Domínguez

et al. 2020

Sci Rep

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“…Although tilapia has been farmed for thousands of years, expansion in commercial tilapia farming started in the 1980s, followed by a rapid increase in production (Teletchea, 2019) after the establishment of the first breeding program for Nile tilapia in 1988, by a collaboration between the International Center for Living Aquatic Resources Management (ICLARM, later renamed World-Fish) and AKVAFORSK in Norway. The project was named Genetically Improved Farmed Tilapia (GIFT), generated by crossing four wild strains from Africa and four farmed strains from the Philippines (Eknath et al, 1993).…”

Section: Domestication and Selective Breedingmentioning

confidence: 99%

Genomics to accelerate genetic improvement in tilapia

2020

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Summary Selective breeding of tilapia populations started in the early 1990s and over the past three decades tilapia has become one of the most important farmed freshwater species, being produced in more than 125 countries around the globe. Although genome assemblies have been available since 2011, most of the tilapia industry still depends on classical selection techniques using mass spawning or pedigree information to select for growth traits with reported genetic gains of up to 20% per generation. The involvement of international breeding companies and research institutions has resulted in the rapid development and application of genomic resources in the last few years. GWAS and genomic selection are expected to contribute to uncovering the genetic variants involved in economically relevant traits and increasing the genetic gain in selective breeding programs, respectively. Developments over the next few years will probably focus on achieving a deep understanding of genetic architecture of complex traits, as well as accelerating genetic progress in the selection for growth‐, quality‐ and robustness‐related traits. Novel phenotyping technologies (i.e. phenomics), lower‐cost whole‐genome sequencing approaches, functional genomics and gene editing tools will be crucial in future developments for the improvement of tilapia aquaculture.

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“…For "domestic animal," this is because this sort of dichotomous perspective wild/domestic is false and obscures the existence of transitional forms [32,36,[73][74][75]. This is why the concept of "domestication level" was proposed for fish to describe more accurately the diversity of production methods as a continuum [52], from fishing up to the rearing of genetically improved animals [24,25,41,76,77]. This concept could be applied to other animals [26,27] and may help describing the evolution of farmed species through both space and time in the future [36,73].…”

Section: Final Considerationsmentioning

confidence: 99%

Animal Domestication: A Brief Overview

Teletchea¹

2019

Animal Domestication

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In the origin of modern humans, hunting of wild animals and gathering of wild plants in nature were the primary subsistence strategies. Yet, about 12,000 years ago, the domestication of plants and animals began. The two main goals of the present chapter are to briefly describe (i) how wild animals were domesticated and (ii) what are the main biological consequences for the major farmed species (cattle, pig, sheep, goat, and horse). During about 98% of their domestication history, domestic animals have been managed in a sustainable way by farmers, followed by a period of strong selection about 200 years ago to produce hundreds of well-defined breeds. A few decades ago, the selection pressures have further increased, leading to a few industrial breeds, which were introduced in numerous countries, most often at the expense of local breeds. Within a few decades, we thus might lose most of the highly valuable farm animal genetic resources that humans have gradually selected over the past millennia. Consequently, priorities should be given to preserve the genetic resources in marginal or rare breeds, and selection programs should aim at restoring the genetic diversity in industrial breeds.

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Fish Domestication: An Overview

Cited by 21 publications

References 82 publications

Whole genome re-sequencing reveals recent signatures of selection in three strains of farmed Nile tilapia (Oreochromis niloticus)

Whole genome re-sequencing reveals recent signatures of selection in three strains of farmed Nile tilapia (Oreochromis niloticus)

Genomics to accelerate genetic improvement in tilapia

Animal Domestication: A Brief Overview

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