Genetic diversity and population structure of the African catfish, Clarias gariepinus (Burchell, 1822) in Kenya: implication for conservation and aquaculture – Corrigendum

Barasa, James E.; Mdyogolo, Sinebongo; Abila, Romulus; Grobler, J. Paul; Skilton, Robert A.; Bindeman, Hesmari; Njahira, Moses; Chemoiwa, Emily Jepyegon; Dangasuk, O.G.; Kaunda‐Arara, Boaz; Verheyen, Erik

doi:10.26496/bjz.2017.14

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Genetic variation in terms of average number of alleles per locus of hatchery stocks in this study fall in the same range as previously reported for four hatchery stocks from central Thailand (A = 4.67-12.17; A e = 3.15-5.80) 12 , and slightly lower than those of hatchery stocks in Kenya, based on the same sets of microsatellites (A = 8.83-10.83, A e = 5.5-5.9) 9 . In general, loss of alleles is commonly occurred in hatchery populations and was accounted by founder effects (using a small number of founders) and subsequent genetic drift and inbreeding 26,27 .…”

Section: Genetic Variation Of the Stockssupporting

confidence: 87%

“…This indicated the existence of germplasm diversity of Cg which is essential for genetic improvement. In fact, Cg possesses high genetic diversity both in natural habitats and hatcheries in its native countries 9,33 . However, the genetic diversity among populations of the introduced stocks have depended on acquired genetic diversity of the founder stocks as well as gene-flow among them.…”

Section: Genetically Distinct Hatchery Stocksmentioning

confidence: 99%

“…Cg has been intensively translocated, mainly within Africa and Asia and, to a lesser extent, to Europe and Latin America 3 . There has been a concern that the introduced stocks, after a few generations in hatcheries, would show a decline of genetic variation, as has been documented for introduced/hatchery stocks of Cg [5][6][7] with a few exceptions 8,9 . This eventually compromised the species' performance in aquaculture.…”

Section: Introductionmentioning

confidence: 99%

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Genetic diversity of the North African catfish, Clarias gariepinus (Burchell, 1822) hatchery stocks in Thailand

Wachirachaikarn¹,

Na-Nakorn²

2019

ScienceAsia

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Information on levels of genetic variation is a prerequisite for successful natural resource management and genetic improvement programs. In this study we aimed to identify genetically distinct stocks of North African catfish, Clarias gariepinus (Burchell, 1822) in Thailand which could be used as germplasm sources for a selective breeding program. Four hatchery stocks (n = 50 fish/population) were sampled, three from northeastern provinces (Sakon Nakhon, SN; Nong Khai, NK; and Nakhon Ratchasima, NR), and one from central Thailand (Nakhon Nayok, NY). Six microsatellite loci were scored using primers developed for this species. The results revealed significant genetic differentiation among stocks (F ST = 0.096; CI = 0.045-0.166) with all but one pair of stocks (NK vs SN) being significantly different, as shown by pair-wise F ST. Three stocks showed homozygote excess. Further analyses showed no recent bottlenecks, but some evidence of genotype disequilibrium. Allele diversity was low (A ranged from 6.00-7.00; A e ranged from 3.43-4.59) while heterozygosity was moderate (H o ranged from 0.52-0.72; H e ranged from 0.67-0.77). The effective population sizes (N e) based on linkage disequilibrium method were between 22.2 and 133 individuals. The neighbor-joining (NJ) tree was robust and revealed the closest genetic relationship between SN and NK, which were clearly separated from NR and NY. Two groups of stocks (northeastern, NK+NR+SN vs NY) showed highest variation among groups (13%) as revealed by AMOVA. The results apparently revealed genetically distinct stocks of North African catfish in Thailand which are useful for establishing a base population for a genetic improvement program.

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Section: Genetic Variation Of the Stockssupporting

confidence: 87%

Section: Genetically Distinct Hatchery Stocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic diversity of the North African catfish, Clarias gariepinus (Burchell, 1822) hatchery stocks in Thailand

Wachirachaikarn¹,

Na-Nakorn²

2019

ScienceAsia

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Advances in African Catfish (Clarias Gariepinus) Seed-Production Techniques in Kenya

Munguti¹,

Iteba²

2022

Catfish - Advances, Technology, Experiments

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African catfish is one of the aquaculture species in Kenya and a potential source of cheap protein for human nutrition. However, the major hindrance in the culture of catfish is seed production. The high-mortality rate of fry and fingerlings experienced by hatchery operators has limited the access and availability of catfish seeds. This had resulted in low-annual average production of farmed catfish. To address these challenges, different methods have been employed to enhance its seed production. One of such methods is induced spawning followed by larval rearing by the use of live feed like Artemia, thereafter, fry rearing with dry formulated feed, sorting by size, and stocking in nursery ponds. This chapter, therefore, will review the different mechanisms that had been adopted to enhance the seed production of catfish thus boosting its production in Kenya.

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Genetic diversity and population structure of the African catfish, Clarias gariepinus (Burchell, 1822) in Kenya: implication for conservation and aquaculture – Corrigendum

Abstract: This Corrigendum does not have an abstract.

Cited by 2 publications

References 13 publications

Genetic diversity of the North African catfish, Clarias gariepinus (Burchell, 1822) hatchery stocks in Thailand

Genetic diversity of the North African catfish, Clarias gariepinus (Burchell, 1822) hatchery stocks in Thailand

Advances in African Catfish (Clarias Gariepinus) Seed-Production Techniques in Kenya

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