Short Communication

Invasive alien freshwater fishes in the Wilderness Lakes System, a wetland of international importance in the Western Cape Province, South Africa

Published in: African Zoology
Volume 46, issue 1, 2011 , pages: 179–184
DOI: 10.1080/15627020.2011.11407491
Author(s): A. A. OldsDepartment of Ichthyology and Fisheries Science, South Africa, M. K. S. SmithSouth African National Parks, Scientific Services, South Africa, O. L. F. WeylSouth African Institute for Aquatic Biodiversity, South Africa, I. A. RussellSouth African National Parks, Scientific Services, South Africa


The Wilderness Lakes System incorporates a RAMSAR listed wetland. Previous ichthyological surveys reported three invasive freshwater fishes; Oreochromis mossambicus (Mozambique tilapia), Gambusia affinis (mosquitofish) and Micropterus salmoides (largemouth bass) from this system. To assess the status of these alien fishes, the fish assemblages in the lakes system were sampled with seine nets and fyke nets in 2009 and 2010. A total of 87 893 fish comprising 16 species were caught. In addition to confirming the persistence of O. mossambicus and G. affinis in the system, the current study also reports the presence of a new invader, Cyprinus carpio (common carp). M. salmoides were absent from 2009 and 2010 samples.

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