Articles by Author: Wj Luus Powell

Search results for Wj Luus Powell

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  1. A comparative assessment of the health status of feral populations of <em>Clarias gariepinus</em> from three dams in the Limpopo and Olifants river systems, Limpopo province, South Africa, using the fish health assessment index protocol

    A comparative assessment of the health status of feral populations of <em>Clarias gariepinus</em> from three dams in the Limpopo and Olifants river systems, Limpopo province, South Africa, using the fish health assessment index protocol

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    An evaluation of the health status of feral populations of the freshwater catfish Clarias gariepinus was carried out between 2009 and 2010 at three dams in the Limpopo and Olifants river systems with varying levels of human impact. Fish health...
  2. Ecological status of Hout River Dam, Limpopo province, South Africa, using fish condition and health assessment index protocols: a preliminary investigation

    Ecological status of Hout River Dam, Limpopo province, South Africa, using fish condition and health assessment index protocols: a preliminary investigation

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The ecological status of Hout River Dam was evaluated in 2011 by assessing fish health, based on condition factor (K), health assessment index (HAI) and inverted parasite index (IPI), which provided a simple and rapid means of establishing the health...
  3. Metal bioaccumulation in the fish of the Olifants River, Limpopo province, South Africa, and the associated human health risk: a case study of rednose labeo <em>Labeo rosae</em> from two impoundments

    Metal bioaccumulation in the fish of the Olifants River, Limpopo province, South Africa, and the associated human health risk: a case study of rednose labeo <em>Labeo rosae</em> from two impoundments

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Olifants River, Limpopo River system, is now one of the most polluted rivers in South Africa. The concentrations of metals in fish muscle tissue from two impoundments on the Olifants River, Flag Boshielo Dam and Phalaborwa Barrage, were measured...
  4. Microcystin-LR equivalent concentrations in fish tissue during a postbloom <em>Microcystis</em> exposure in Loskop Dam, South Africa

    Microcystin-LR equivalent concentrations in fish tissue during a postbloom <em>Microcystis</em> exposure in Loskop Dam, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used to confirm the presence of microcystin-LR equivalent...
  5. The occurrence of metazoan endoparasites of <em>Schilbe intermedius</em> Rüppell, 1832 from the Nwanedi-Luphephe Dams in the Limpopo River System, South Africa

    The occurrence of metazoan endoparasites of <em>Schilbe intermedius</em> Rüppell, 1832 from the Nwanedi-Luphephe Dams in the Limpopo River System, South Africa

    Item type: Journal Article • Journal: African Zoology
    The present study deals with the survey of endoparasites from Schilbe intermedius (silver catfish) at the Nwanedi-Luphephe Dams from July 2009 to May 2010. The hosts (n = 60) were collected using gill nets and examined for endoparasites. The following...
  6. Monogenean parasite species descriptions from <em>Labeo</em> spp. hosts in the Vaal Dam, South Africa

    Monogenean parasite species descriptions from <em>Labeo</em> spp. hosts in the Vaal Dam, South Africa

    Item type: Journal Article • Journal: African Zoology
    Specimens of Labeo capensis (n = 13) and Labeo umbratus (n = 26) from the Vaal Dam (South Africa) were collected and examined for gill and skin monogenean parasites. Three new Dactylogyrus and one new Dogielius species are described. Dactylogyrus...
  7. Seasonal dynamics and occurrences of three <em>Dactylogyrus</em> species on the gills of three cyprinids at Nwanedi–Luphephe dams in Limpopo province, South Africa

    Seasonal dynamics and occurrences of three <em>Dactylogyrus</em> species on the gills of three cyprinids at Nwanedi–Luphephe dams in Limpopo province, South Africa

    Item type: Journal Article • Journal: African Zoology
    This study investigated the seasonal dynamics and occurrence of dactylogyrids on the gills of three cyprinids at Nwanedi–Luphephe dams from January to October 2008. The hosts, Labeobarbus marequensis (n = 53), Barbus trimaculatus (n = 63) and Barbus radiatus (n = 46), were collected using gill...
  8. Distribution of <em>Contracaecum</em> (Nematoda: Anisakidae) larvae in freshwater fish from the northern regions of South Africa

    Distribution of <em>Contracaecum</em> (Nematoda: Anisakidae) larvae in freshwater fish from the northern regions of South Africa

    Item type: Journal Article • Journal: African Zoology
    A total of 1 847 fishes (16 species) from 14 reservoirs in northern and north-eastern regions of South Africa were collected and examined for larval Contracaecum spp. between 2005 and 2013. This study, the first to examine several potential second...
  9. Ecology of metazoan parasites of <em>Clarias gariepinus</em> (Osteichthyes: Clariidae) from the Nwanedi-Luphephe Dams of the Limpopo River System, South Africa

    Ecology of metazoan parasites of <em>Clarias gariepinus</em> (Osteichthyes: Clariidae) from the Nwanedi-Luphephe Dams of the Limpopo River System, South Africa

    Item type: Journal Article • Journal: African Zoology
    A total of 7748 parasites, belonging to 17 metazoan species, was recorded from 45 specimens of Clarias gariepinus (Burchell, 1822) caught from the Nwanedi-Luphephe Dams, Limpopo River System, South Africa. All host specimens were parasitized by one or more metazoan...
  10. Metal contamination and human health risk associated with the consumption of <em>Labeo rosae</em> from the Olifants River system, South Africa

    Metal contamination and human health risk associated with the consumption of <em>Labeo rosae</em> from the Olifants River system, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Olifants River, a tributary of the Limpopo River system, is one of the most polluted rivers in South Africa. In May 2011 the concentrations of metals in fish muscle tissue from two impoundments, Loskop and Flag Boshielo dams, on...