Microsatellites revealed no genetic differentiation between hatchery and contemporary wild populations of striped catfish, Pangasianodon hypophthalmus (Sauvage 1878) in Vietnam

Ha, Hung Phuoc; Nguyen, Thuy Thi Thu; Poompuang, Supawadee; Na-Nakorn, Uthairat

doi:10.1016/j.aquaculture.2009.03.017

Cited by 27 publications

(32 citation statements)

References 45 publications

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“…Previous reports in different fish species have confirmed that intensive domestic management stimulates the significant reduction of genetic diversity (Kohlmann et al 2007;Thai et al 2007, Ha et al 2009Na-Nakorn and Moiekun, 2009). Bottleneck events may occur, due to population isolation, reduction of effective number of breeders and/or genetic drift caused by a small number of founders (Harlt and Clark, 2007).…”

Section: Resultsmentioning

confidence: 73%

Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico

Parra‐Bracamonte¹,

Sifuentes‐Rincón²,

Rosa-Reyna³

et al. 2011

Electro Journal of Biotech

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Background: Channel catfish are one of the most important aquaculture species raised for food purposes in Mexico. Two temporal samples were obtained from the largest channel catfish breeding hatchery in Mexico to identify changes in genetic diversity and inbreeding that are promoted by traditional hatchery management. Results: The genetic parameter analysis of 11 microsatellite loci showed no significant change in genetic diversity (p > 0.05). However, a significant heterozygosis deficiency was detected (p < 0.001), and genetic structure analysis indicated moderate differentiation between the temporally divided populations (FST = 0.08). A moderate level of inbreeding and a slight increase of the inbreeding coefficient from 0.23 to 0.27 were the result of traditional hatchery practices. To achieve an effective population size, the temporal approach resulted in a limited number of breeders to maintain genetic variability. Conclusions: Although no significant change in genetic diversity parameters was found, the heterozygote deficiency and low effective number of breeders suggest that there is a risk for increased inbreeding. Thus, we propose the need for controlled reproductive management and the establishment of genetic programs in hatcheries. Molecular tools can provide valuable information to facilitate the achievement of these goals.

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Section: Resultsmentioning

confidence: 73%

Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico

Parra‐Bracamonte¹,

Sifuentes‐Rincón²,

Rosa-Reyna³

et al. 2011

Electro Journal of Biotech

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“…In a sector that is growing fast and with increasing restrictions coming into place with regard to the procurement of wild broodstock (Nguyen 2009), which are mostly found in Cambodian waters, there is a need for a concerted effort to put into place long‐term broodstock management plans using modern genetic knowledge. A recent study by Ha et al. (2009) revealed that there was no genetic differentiation between hatchery and contemporary wild populations of striped catfish ( P. hypophthalmus ), perhaps reiterating the suggestion that existing stocks could be used to put into place a scientifically based broodstock management plan, and to use such stocks for genetic improvement through selective breeding for traits that are desirable.…”

Section: Integration Of Production Units (Seed/nursery/grow‐out)mentioning

confidence: 99%

Striped catfish farming in the Mekong Delta, Vietnam: a tumultuous path to a global success

Silva

Phương

2011

Reviews in Aquaculture

123

106

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The striped catfish (Pangasianodon hypophthalmus) (Sauvage), also referred to as tra catfish or sutchi catfish, farming sector is an icon of aquaculture development in Vietnam and globally. Over a decade it has developed from a humble backyard operation to one that currently accounts for the production of over one million tonnes, employing over 180 000 rural poor, and generating an export income exceeding US$ 1.4 billion (2010). It accounts for the highest average production, ranging from 200 to 400 t ha )1 crop, ever recorded for the primary production sector. The system is integrated and incorporates seed production, fry to fingerling rearing and grow-out, and is concentrated in a few provinces in the Mekong Delta (8°33¢-10°55¢N, 104°30¢-106°50¢E), along two branches of the Mekong River. In essence, perhaps, the initial trade restrictions on catfish exports to the USA provided the impetus and then the associated developments from 2002 to 2005 of the sector to a great extent in seeking new markets. The explosion of tra catfish farming has resulted in many competitive sectors challenging this 'tra catfish' invasion into a globalized market. These confrontations still exist with many instances of attempts to discredit the sector and discourage international consumers. However, the Vietnamese catfish sector is resilient and has managed to withstand such pressures and continues to thrive. This paper reviews the development of catfish farming in the Mekong Delta, its current status and what is required to sustain it as a major food source and livelihood provider.

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“…Surprisingly, there was no evidence from microsatellite data of a recent reduction in effective population size, despite the extensive exploitation of fry and fingerlings in the past. Ha et al. (2009) did not find any significant genetic differentiation between captive and wild stocks in Vietnam based on five microsatellite markers developed by Na‐Nakorn et al.…”

Section: Patterns Of Use and Exchange Of Aquatic Genetic Resourcesmentioning

confidence: 89%

Patterns of use and exchange of genetic resources of the striped catfish Pangasianodon hypophthalmus (Sauvage 1878)

Nguyen

2009

Reviews in Aquaculture

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The present paper reviews the use and exchange of genetic resources of the migratory freshwater fish Pangasianodon hypophthalmus (Sauvage 1878) (the striped or sutchi catfish). This species is naturally distributed in the Mekong River and Chao Phraya River basins, and is cultured in several countries, but current production occurs predominantly in the Mekong Delta, Vietnam. Catfish aquaculture in Vietnam has evolved from extensive systems using wild‐caught seed to an intensified farming system that is entirely dependent on hatchery‐produced seed. Genetic improvement programmes on catfish have started in Vietnam, but are still in their infancy. Genetic studies have revealed several subpopulations of the species. Apart from selective breeding and the production of hybrids with closely related species, no other technologies have been applied to improve the performance of catfish. The use and exchange of P. hypophthalmus genetic resources have brought benefits to rural communities. Aquaculture development of catfish has evolved from being seen as an exploitation of natural resources to an activity that can reduce pressure on wild fish populations. Management of aquaculture stocks need to be rationalised to minimise the potential impacts it might cause to wild populations.

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Microsatellites revealed no genetic differentiation between hatchery and contemporary wild populations of striped catfish, Pangasianodon hypophthalmus (Sauvage 1878) in Vietnam

Cited by 27 publications

References 45 publications

Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico

Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico

Striped catfish farming in the Mekong Delta, Vietnam: a tumultuous path to a global success

Patterns of use and exchange of genetic resources of the striped catfish Pangasianodon hypophthalmus (Sauvage 1878)

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