oa African Zoology - Aspects on the ecology of Barbus kimberleyensis and Barbus holubi in the Vaal River

Volume 8, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X



From the summarized data presented in the present paper several factors contributing to the paucity of Barbus kimberleyensis were illuminated. Soil erosion causes extremely turbid conditions in the water of the Vaal River for almost the whole year and therefore restricts the ability of the predatory species to see its prey. Another factor which is most certainly one of the major causes of the limited reproduction is the slow growth-rate and the age at which both sexes reach sexual maturity. With the increasing angling pressure this may give rise to a critical situation in the near future. In contrast to Barbus kimberleyensis, Barbus holubi is abundant in the Vaal River probably due to its omnivorous feeding habits which make it more adaptable to turbid water conditions. In addition both sexes reach sexual maturity at a younger stage than those of the large-mouth yellowfish.

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