Articles by Author: N D Impson

Search results for N D Impson

We found 10 results for you
  1. GENETIC VARIATION BETWEEN FOUR WHITEFISH <em>BARBUS ANDREWI</em> (PISCES: CYPRINI-DAE) POPULATIONS AND POSSIBLE IMPLICATIONS FOR CONSERVATION MANAGEMENT

    GENETIC VARIATION BETWEEN FOUR WHITEFISH <em>BARBUS ANDREWI</em> (PISCES: CYPRINI-DAE) POPULATIONS AND POSSIBLE IMPLICATIONS FOR CONSERVATION MANAGEMENT

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The endemic whitefish, Barbus andrewi, from the Western Cape Province of South Africa is threatened due to the impacts of predatory alien fishes and unsustainable use of its riverine habitat. A study was undertaken to determine the extent of genetic...
  2. A preliminary assessment of the impact of alien rainbow trout (<em>Oncorhynchus mykiss</em>) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa

    A preliminary assessment of the impact of alien rainbow trout (<em>Oncorhynchus mykiss</em>) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Impacts of alien rainbow trout (Oncorhynchus mykiss) on critically endangered Berg River redfin (Pseudobarbus burgi), Cape kurper (Sandelia capensis) and Cape galaxias (Galaxias zebratus) in the upper Berg River were investigated in terms of predation and spatial interactions. Trout stomach...
  3. The predatory impact of invasive alien smallmouth bass, <em>Micropterus dolomieu</em> (Teleostei: Centrarchidae), on indigenous fishes in a Cape Floristic Region mountain stream

    The predatory impact of invasive alien smallmouth bass, <em>Micropterus dolomieu</em> (Teleostei: Centrarchidae), on indigenous fishes in a Cape Floristic Region mountain stream

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Fish populations in the Rondegat River, a mountain stream in the Olifants-Doring system in the Cape Floristic Region, South Africa were surveyed to assess the impact of predatory alien invasive smallmouth bass Micropterus dolomieu (Lacepède) on the indigenous fishes. This...
  4. Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, <em>Galaxias zebratus</em> Castelnau 1861, reveals a possible species complex

    Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, <em>Galaxias zebratus</em> Castelnau 1861, reveals a possible species complex

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Cape galaxias, Galaxias zebratus, is part of the paleao-endemic fauna characteristic of the south-western Cape, South Africa, and is the only galaxiid found in continental Africa. A 284-bp fragment of the cytochrome b region of the mtDNA was sequenced...
  5. Genetically distinct Dutch-domesticated <em>Clarias gariepinus</em> used in aquaculture in southern Africa

    Genetically distinct Dutch-domesticated <em>Clarias gariepinus</em> used in aquaculture in southern Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Clarias gariepinus, a catfish species widely distributed in Africa including South Africa, is naturally absent from the Western Cape and the coastal Eastern Cape provinces. Because of its potential as an aquaculture species it has been widely used in aquaculture...
  6. An assessment of a proposal to eradicate non-native fish from priority rivers in the Cape Floristic Region, South Africa

    An assessment of a proposal to eradicate non-native fish from priority rivers in the Cape Floristic Region, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Non-native fish are considered the most important threat to the survival of the indigenous freshwater fishes in the Cape Floristic Region (CFR). A pilot project to evaluate the use of the piscicide rotenone to eradicate non-native fish from selected reaches...
  7. Conservation biology and management of a critically endangered cyprinid, the Twee River redfin, <em>Barbus erubescens</em> (Teleostei: Cyprinidae), of the Cape Floristic Region, South Africa

    Conservation biology and management of a critically endangered cyprinid, the Twee River redfin, <em>Barbus erubescens</em> (Teleostei: Cyprinidae), of the Cape Floristic Region, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Twee River redfin Barbus erubescens is a critically endangered small cyprinid endemic to the Twee River System, a subcatchment of the Olifants-Doring River System of South Africa. It is currently the most threatened freshwater fish in both the Cape...
  8. The impact of invasive fish and invasive riparian plants on the invertebrate fauna of the Rondegat River, Cape Floristic Region, South Africa

    The impact of invasive fish and invasive riparian plants on the invertebrate fauna of the Rondegat River, Cape Floristic Region, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Invasive fish and plants are widespread in the rivers and riparian zones of the Cape Floristic Region of South Africa and represent potential threats to the highly endemic freshwater fauna. We investigated the impact of invasive smallmouth bass (Micropterus dolomieu)...
  9. Preliminary evaluation of the impact of invasive smallmouth bass <em>Micropterus dolomieu</em> on native fish abundance in the Witte River, Cape Floristic Region, South Africa

    Preliminary evaluation of the impact of invasive smallmouth bass <em>Micropterus dolomieu</em> on native fish abundance in the Witte River, Cape Floristic Region, South Africa

    Item type: Journal Article • Journal: African Zoology
    The impact of invasive smallmouth bass, Micropterus dolomieu, on the abundance of two native fish species, Breede River redfin, Pseudobarbus burchelli, and Cape kurper, Sandelia capensis, was investigated in the Witte River tributary of the Breede River in South Africa’s...
  10. Record of Blue tilapia <em>Oreochromis aureus</em> (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa

    Record of Blue tilapia <em>Oreochromis aureus</em> (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Oreochromis aureus was imported from Israel into South Africa in 1959 but data on its current status in South Africa are lacking. Genomic DNA was extracted and the COI gene amplified at the South African Institute for Aquatic Biodiversity. The...