Allozyme variation in Schilbe intermedius Rüppel, 1832 (Pisces, Siluriformes) from the upper Zambezi River System

Engelbrecht, G.D.; Bank, F.H. van der; Mulder, P.F.S.

doi:10.1016/0305-0491(94)90034-5

Cited by 2 publications

(1 citation statement)

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“…Our value (H = 1.9) and that of other studies of fish from the Zambezi River (e.g. Engelbrecht et al 1994; H = 2.9) falls within the above-mentioned range. Previous studies have shown that the geographical complexities of a system may play a role in the genetic variation of populations therein (Mulder et al 1990, Engelbrecht et al 1997).…”

Section: Comparison Of All Three Populations At the Same Locisupporting

confidence: 67%

Low allozyme variation in tigerfishHydrocynus vittatus(Teleostei: Alestidae) from the Okavango panhandle, with notes on the selection of candidates for artificial breeding

Soekoe

Smit

Bank

2009

African Journal of Aquatic Science

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To ensure the utilisation of optimal tigerfish gene pools for artificial propagation, the hypothesis that tigerfish from the Okavango system should have greater heterozygosity than those from smaller river systems was tested. This electrophoretic analysis provides the first report of the quantity and pattern of genetic variation for tigerfish of the Okavango Delta to be considered for artificial propagation and as candidates for an evolutionary significant unit. Mean heterozygosity was 1% in the Okavango, as compared to 1.9% in the Upper Zambezi and 5.6% in the Olifants River systems. Possible reasons for this anomaly, in terms of the Hardy-Weinberg principle, include the founder effect caused when the Okavango and Zambezi rivers became separated, and/or that the Okavango is a more stable system and therefore that a large variation might not be required in its individuals for survival. Significant differences of genotypes were found among all populations previously studied. The selection of potential candidates for artificial breeding is discussed.

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Section: Comparison Of All Three Populations At the Same Locisupporting

confidence: 67%