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Abstract
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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
Submitted: 2011 April, 18
Accepted: 2011 June, 10
Published: 2011 August, 30 |
Abstract:
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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.
Key words: Chimera, chromosome, Clarias, karyotype, taxonomy, ,
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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, . Karyotypic Description of Six Species of Clarias (Siluriformes: Clariidae) from South West Nigeria. International Journal of Animal and Veterinary Advances, (4): 264-273.
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ISSN (Online): 2041-2908
ISSN (Print): 2041-2894 |
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