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Protein variation in Schilbe mystus (L.) and Eutropius niloticus (Ruppel) (Pisces siluriformes) in the Volta Basin of Ghana, West Africa

1988; Wiley; Volume: 19; Issue: 1 Linguagem: Inglês

10.1111/j.1365-2109.1988.tb00330.x

1365-2109

E.K. Abban, D. O. F. Skibinski,

Genetic diversity and population structure

Schilbe mystus (L.) and Eutropius niloticus (Ruppel) (fm. Schilbeidae) from rivers of the Volta Basin were screened at 18 enzyme loci for electrophoretically detectable variation. The mean observed heterozygosity was 0.001 in S. mystus and 0.018 in E. niloticus. The possible causes of these rather low levels of genetic variation are considered in relation to natural and human influences in the Volta Basin river system. The results also suggest that the species S. mystus consists of several distinct biological species and that E. niloticus may have evolved from within the Schilbe group.