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  • 1
    Electronic Resource
    Electronic Resource
    Experimental hybridization between catfishes of the families Clariidae and Pangasiidae in Thailand (1986)
    Springer
    Environmental biology of fishes 16 (1986), S. 317-320 
    Details
    ISSN: 1573-5133
    Keywords: Interfamilial hybrids ; Pangasius sutchi ; Clarias macrocephalus ; Hybrid morphotypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Hybrids between the clariid speciesClarias macrocephalus andC. batrachus and the pangasiid speciesPangasius sutchi were obtained by hormone injection of brood stock and artificial fertilization. Pure parental crosses as well as all possible hybrid combinations were obtained. Fertility, hatchability, and post-yolk absorption survival was high (66–99%) in all pure parental crosses and in all crosses between the two species ofClarias. In crosses betweenClarias andPangasius fertilization was also very high (68–97%) but hatchability varied from 11 to 23% and post-yolk absorption survival from 0% inPangasius sutchi ♂ ×Clarias batrachus ♀ to about 50% inPangasius sutchi ♂ ×Clarias macrocephalus ♀. The longest-lived hybrids ofPangasius andClarias were those ofPangasius sutchi ♂ ×Clarias macrocephalus ♀ which survived until the experiment was prematurely terminated due to contaminated food after 4 1/2 months, at which point they had grown to total lengths of 8–14cm. The hybrids comprised four morphotypes, two relativelyPangasius-like and two relativelyClarias-like, but all markedly different from the parental species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00842987
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromosome study of hybrid and gynogenetic offspring of artificial crosses between members of the catfish families Clariidae and Pangasiidae (1993)
    Springer
    Environmental biology of fishes 37 (1993), S. 317-322 
    Details
    ISSN: 1573-5133
    Keywords: Interfamilial hybridization ; Hybrid morphotypes ; Triploid ; Clarias macrocephalus ; Pangasius sutchi ; Fishes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Artificial hybridization between species of the catfish families Clariidae (Clarias macrocephalus) and Pangasiidae (Pangasius sutchi) resulted in first generation offspring comprising two intermediate morphotypes and one morphotype indistinguishable from its clariid parent. The two intermediate morphotypes apparently correspond to hybrid morphotypes 2 and 4 resulting from earlier hybridization experiments between the same parent species (Tarnchalanukit 1986). We did not obtain morphotypes 1 and 3. Chromosome spreads of the relatively pangasiid-like morphotype 2 reveal a diploid number of 57, presumably comprising one set of Clarias (n=27) and one of Pangasius (n=30) chromosomes. The relatively clariid-like morphotype 4 is a triploid with 84 chromosomes, presumably comprising two sets from Clarias (2n=54) and one from Pangasius (n=30). Finally, the morphotype indistinguishable from Clarias, is a diploid with 54 chromosomes, apparently arising from gynogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004639
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    Paper (German National Licenses)
    Fulltext
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