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2011 (Vol. 3, Issue: 4)
Article Information:

Karyotypic Description of Six Species of Clarias (Siluriformes: Clariidae) from South West Nigeria

Ojo T. Ifeoluwa, Adedapo O. Adeogun, Adekunle A. Bakare, Akindayo A. Sowunmi, Adiaha A.A. Ugwumba and Obih Alex Ugwumba
Corresponding Author:  Adekunle A. Bakare 

Key words:  Chimera, chromosome, Clarias, karyotype, taxonomy, ,
Vol. 3 , (4): 264-273
Submitted Accepted Published
2011 April, 18 2011 June, 10 2011 August, 30
Abstract:

Data on karyotype of fishes in Nigeria is limited. In this study, chromosome analysis of Clarias anguillaris (Linnaeus, 1758), C. pachynema (Boulenger, 1903), C. gariepinus (Burchell, 1862) C. camerunensis (Lonnberg, 1895), C. jaensis (Boulenger, 1909) and C. macromystax (Gunther, 1864) from South-West Nigeria was carried out using the kidney cells. C. anguillaris have variable 2n = 48 and 56. The spread with 2n = 48 comprised 27 metacentric, 10 submetacentric, 3 subtelocentric and 8 telocentric chromosomes; while the spread with 2n = 56, which is the modal diploid number, comprised 33 metacentric, 12 submetacentric, 2 subtelocentric and 9 telocentric chromosomes. C. pachynema with 2n = 66 comprised 30 metacentric, 10 submetacentric, 16 subtelocentric and 10 telocentric chromosomes. The 2n = 56 for C. gariepinus comprised 25 metacentric, 14 submetacentric, 14 subtelocentric and 3 telocentric chromosomes; while same diploid number for C. camerunensis included 22 metacentric, 20 submetacentric, 9 subtelocentric and 5 telocentric chromosomes. C. jaensis had a 2n = 54, comprising 22 metacentric, 12 submetacentric, 5 subtelocentric and 15 telocentric chromosomes, while the 2n = 49 for C. macromystax comprised 27 metacentric 10 submetacentric, 11 subtelocentric and 1 telocentric chromosomes. Idiograms were prepared for each species based on the chromosome measurements. Several reasons were adduced for the karyotypic variability in C. anguillaris. This study is of importance in the evolution, classification and taxonomy of Clarias species and also in monitoring aquatic toxicity.
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  Cite this Reference:
Ojo T. Ifeoluwa, Adedapo O. Adeogun, Adekunle A. Bakare, Akindayo A. Sowunmi, Adiaha A.A. Ugwumba and Obih Alex Ugwumba, 2011. Karyotypic Description of Six Species of Clarias (Siluriformes: Clariidae) from South West Nigeria.  International Journal of Animal and Veterinary Advances, 3(4): 264-273.
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