Albert Chakona
Other projects
29 Aug 2008
Comparative Phylogeography of Pseudobarbus, Barbus, Sandelia and Galaxias Scies in the Breede and Associated River Systems, South Africa: Implications for Conservation of a Threatened Fauna
The Giant redfin, Pseudobarbus skeltoni Chakona & Swartz 2013, is a newly described primary freshwater fish restricted to the Breede River system in the Cape Floristic Region (CFR) of South Africa. With only two known remnant populations, and severe threat of invasion by alien predators, the species faces a high risk of extinction. The aims of the this study are to:
(i) verify the distribution and population size of P. skeltoni,
(ii) characterize its biology, habitat use and feeding ecology,
(iii) assess its conservation status, and
(iv) identify conservation measures to ensure future survival of this species.
Mature Giant redfin male in the upper Riviersonderend.
Endemic primary freshwater fishes of the CFR are facing a variety of impacts including hydrological modifications, degradation of habitats and widespread invasion of the rivers by non-native piscivores, in particular the African sharptooth catfish Clarias gariepinus, rainbow trout Oncorhynchus mykiss and the North American black basses Micropterus salmoides, M. dolomieu, M. punctulatus. These impacts have collectively resulted in several local extinctions in a number of mountain tributaries and extirpations of almost all main-stem populations of native freshwater fishes.
The purpose of this study is to generate scientific data and provide information that will guide decision makers on how to protect native freshwater fishes of the CFR. Sound knowledge of species life histories, ecology, population size and distribution as well as an understanding of the social component that interacts with the environment are fundamental requirements for the design and implementation of effective conservation strategies.
Specifically, the proposed study aims to update information about the population size and distribution of P. skeltoni, characterise this species’ habitat and feeding ecology, assess its conservation status, identify major threats and determine appropriate measures to mitigate them. Based on evidence of the historical existence of this species in the lower Wit River which is now infested with alien fishes (Chakona & Swartz, 2013), a comprehensive survey of the lower Wit will be conducted to assess feasibility of rehabilitating and protecting this stream as this would create an important opportunity for successful reintroduction to ensure future survival of P. skeltoni. Findings of this research will help to guide ongoing efforts by CapeNature (the regional conservation body in the Western Cape Province of South Africa) and stakeholders (land owners, wine farmers and anglers) to identify Priority Rivers for rehabilitation and protection to prevent further loss of native stream fishes in the CFR.