Crossing of African catfish, Clarias gariepinus (Burchell, 1822), strains based on strain selection using genetic diversity data

Wachirachaikarn, Anyalak; Rungsin, Wikrom; Srisapoome, Prapansak; Na-Nakorn, Uthairat

doi:10.1016/j.aquaculture.2009.01.036

Cited by 37 publications

(41 citation statements)

References 47 publications

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“…All of our F ST values are in the low range of differentiation. Wachirachaikarn et al (2009) suggested that R ST is more powerful than F ST because it utilizes information on allele size in the estimation of popu-lation differentiation; also Slatkin (1995) demonstrated that R ST should be larger than F ST for microsatellite data under the assumption of SMM as mutation model but results did not show any significant difference between F ST and R ST values. However, Slatkin (1995) and Rousset (1996) showed that F ST and R ST could be similar when migration rate between populations is large and differentiation is independent of the mutation model.…”

Section: Discussionmentioning

confidence: 99%

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

et al. 2011

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Rutilus frisii kutum (Kamenskii, 1901) is one of the most important bony fish inhabiting the Caspian Sea. The Iranian Fisheries Organization produced up to 200 million fry to restock the Caspian Sea population annually. Loss of genetic stocks and gradual depletion of the gene pool are parameters of great concern for the future of the species. In the present study, we used ten microsatellite markers to estimate the level of genetic diversity and compare the degree of genetic differentiation among kutum populations collected from Gharesou, Tajan and Goharbaran rivers in the south of Caspian Sea. The average number of alleles per locus ranged from 4 to 12.33, while the average observed and expected heterozygosity ranged from 0.22 to 1.00 and from 0.69 to 0.88, respectively. Through AMOVA, a low level of variation between regions as well as a large percentage of total variation within population was observed. Current knowledge about artificial breeding suggests that offspring transfer between rivers has probably reduced the natural divergence naturally exists between these pools. These results could be useful for the genetic management of kutum populations.

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Section: Discussionmentioning

confidence: 99%

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

et al. 2011

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“…Clarias macrocephalus (Günther, 1864); Nukwan et al 1990). Captive farm stocks have been maintained in some countries, for example, at least two genetically distinct groups originating from the Central African Republic and Egypt (Li et al 2000) are maintained in four Thai hatcheries (Wachirachaikarn et al 2009). These stocks are valuable for further genetic improvement programs.…”

Section: African Speciesmentioning

confidence: 99%

Use and exchange of aquatic genetic resources for food and aquaculture: Clarias catfish

Na-Nakorn

Brummett

2009

Reviews in Aquaculture

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There are 58 species of Clarias recognized in FishBase (as of January 2009), 33 in Africa and 25 in Asia. Aquaculture of clariids is important with 30 countries reporting a total production of over 300 000 t worth nearly US$400 million in 2006. Most production involves the African Clarias gariepinus (Burchell, 1822) and three Asian species, Clarias batrachus (Linnaeus, 1758), Clarias macrocephalus (Günther, 1864) and Clarias fuscus (Lacep'de, 1803). In much of Asia, hybrids of introduced C. gariepinus with native species dominate aquaculture and may pose threats to the purity and viability of wild populations. Many local strains have evolved within farms, some of which have been described and included in genetic management programs. Genetic variation among species and populations is significant, but to date little work on selective breeding of the group has been reported. Conservation efforts have so far focused on ex situ methods, primarily for farmed stocks, but these are few and expensive and farmed stocks are often of lower genetic diversity than wild stocks. In situ conservation of genetic material, both for aquaculture and for the maintenance of fitness in wild populations in light of changes occurring in the watershed, needs to be considered as a more viable long‐term strategy. The preservation of ecosystem functional integrity is thus a prerequisite for the long‐term conservation of Clarias genetic resources for food and aquaculture.

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“…This species is known for its resistance to diseases, high growth rate, resistance to handling stress, and its ability to tolerate a wide range of environmental parameters and high stocking densities under culture conditions and high meat quality (Elnaggar et al 2006; doi: 10.17221/7906-CJAS Rasowo et al 2007;Wachirachaikarn et al 2009), thus accounting for its commercial importance especially in southeast Asian countries.…”

Section: Introductionmentioning

confidence: 99%

Exploration of natural cryoprotectants for cryopreservation of African catfish, Clarias gariepinus, Burchell 1822 (Pisces: Clariidae) spermatozoa

Muchlisin¹,

Nadiah²,

Nadiya³

et al. 2015

Czech J. Anim. Sci.

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Toxicity is a major limitation to successful spermatozoa cryopreservation of fish. Due to this problem, it is critical to find potential cryoprotectants which are more environmental-friendly, non-toxic, easily prepared, and available at affordable prices. Hence, the objective of the present study was to investigate several natural cryoprotectants for optimal cryopreservation of the African catfish, Clarias gariepinus, Burchell 1822 (Pisces: Clariidae) spermatozoa. Three natural cryoprotectants were tested -egg yolk, glucose, and honey, while DMSO was used as a control at different concentrations (5, 10, and 15%). Sperms were diluted with coconut water at a dilution level of 1 : 20 sperm to extender (v/v). Diluted sperms were kept at 4°C for 5 min, then at 0, -4, and -79°C for 5 min respectively, and stored in liquid nitrogen (-196°C) for 45 days. The cryopreserved sperms were thawed in a water bath (37°C) for 5 min and evaluated for fertilization and hatching rates. The data were subjected to analysis of variance (ANOVA), followed by comparison of means using Duncan's Multiple Range Test. The fertilization and hatching rates of African catfish in all cryoprotectants improved with concentration increasing from 5 to 10% but then decreased when concentration was increased to 15%. The ANOVA test showed that the differences in cryoprotectants used significantly affected fertilization and hatching rates of African catfish. Overall, the fertilization and hatching rates were higher in DMSO for all concentrations compared to other cryoprotectants. However, 10% egg yolk resulted in higher fertilization and hatching rates compared to other natural cryoprotectants. It was concluded that 10% egg yolk was the most suitable concentration for African catfish spermatozoa cryopreservation compared to other natural cryoprotectants tested.

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Crossing of African catfish, Clarias gariepinus (Burchell, 1822), strains based on strain selection using genetic diversity data

Cited by 37 publications

References 47 publications

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

Use and exchange of aquatic genetic resources for food and aquaculture: Clarias catfish

Exploration of natural cryoprotectants for cryopreservation of African catfish, Clarias gariepinus, Burchell 1822 (Pisces: Clariidae) spermatozoa

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