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Potential impacts of alien freshwater crayfish in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I de Moor --- , South AfricaThe habitat preferences and life history characteristics of four alien species of freshwater crayfish (Cherax tenuimanus, C. destructor, C. quadricarinatus and Procambarus clarkii) are reviewed. The potential impact of these species on South African freshwater ecosystems is assessed and the... -
A study of the ichthyofauna of a small tropical reservoir, south-eastern lowveld, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dalu --- Department of Biological Sciences, Zimbabwe BW Clegg --- Malilangwe Wildlife Reserve, Zimbabwe T Nhiwatiwa --- Department of Biological Sciences, ZimbabweFish diversity in Malilangwe Reservoir in the south-eastern lowveld of Zimbabwe was investigated in 2011 to determine the community structure. The aim of this study was to determine the current status of an artificial fish community in a small reservoir... -
Variations and changes in habitat, productivity, composition of aquatic biota and fisheries of the Kyoga lake system: lessons for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Ogutu-Ohwayo --- National Fisheries Resources Research Institute, Uganda K Odongkara --- National Fisheries Resources Research Institute, Uganda W Okello --- National Fisheries Resources Research Institute, Uganda D Mbabazi --- National Fisheries Resources Research Institute, Uganda SB Wandera --- National Fisheries Resources Research Institute, Uganda LM Ndawula --- National Fisheries Resources Research Institute, Uganda V Natugonza --- National Fisheries Resources Research Institute, UgandaThe Kyoga lake system, which is c. 4 m deep, originally had a diverse fish fauna, extensive macrophytes and wetlands. Most (82%) of its water comes from Lake Victoria, is controlled through three dams and has a short residence time... -
Long-term physical, chemical and biological changes in a small, urban estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Viskich --- Department of Biological Sciences and Centre for Invasion Biology, South Africa CL Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa C Erasmus --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries, South Africa S Lamberth --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries, South AfricaThe Diep River estuary, a small estuary in suburban Cape Town, South Africa, has been subject to disturbance for centuries. Several earlier studies have documented conditions in the system, providing baselines against which to measure more recent changes. This study:...