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SHORT-TERM IMPACTS OF FORMULATIONS OF BACILLUS THURINGIENSIS VAR. ISRAELENSIS DE BARJAC AND THE ORGANOPHOSPHATE TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.W. Palmer --- Department of Water Affairs and Forestry, South AfricaThe impacts of larvicides used in the control of blackflies (Diptera: Simuliidae) on macroinvertebrates in the stones-in-current biotope were assessed during 8 field trials in the middle Orange River, South Africa. Two Bacillus thuringiensis var. israelensis (B.t.i.) products (VectobacR 12AS... -
IMPACTS OF REPEATED APPLICATIONS OF BACILLUS THURINGIENSIS VAR. ISRAELENSIS DE BARJAC AND TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.W. Palmer --- Department of Water Affairs and Forestry, South Africa A.R. Palmer --- , South AfricaThe impacts of five consecutive treatments of blackfly larvicides on macroinvertebrates in the middle Orange River were assessed. The abundance of the midge Xenochironomus sp. and the limpet Burnupia sp. was lower at sites treated with Bacillus thuringiensis var. israelensis... -
South African ecotoxicology — present status and future prognosis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: V Wepener --- Water Research Group, School of Environmental Sciences and Development, South Africa PM Chapman --- , CanadaToxicology studies the interactions of a chemical substance with individual organisms, whereas ecotoxicology is a multidisciplinary approach incorporating ecology and other disciplines, e.g. chemistry, microbiology, etc., to determine responses of individuals, populations and whole ecosystems to stressors such as chemicals... -
Metal contamination of sediments and fish from the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Unit for Environmental Sciences and Management, R Pieters --- Unit for Environmental Sciences and Management, JC van Dyk --- Department of Zoology, NJ Smit --- Unit for Environmental Sciences and Management,Mining and other economic activities have led to the pollution of the Vaal River with metals of mainly industrial origin, but the consequences of this for animal and human health are unknown. Based on chemical analysis and histological examination, we... -
Toxicological requirements for risk assessment of shellfish contaminants: a review
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R MundayThere is increasing concern by consumers with regard to the health aspects and safety of foodstuffs. Most food additives and contaminants are controlled by regulatory authorities, with Acceptable Daily Intakes (ADIs) having been set on the basis of detailed acute... -
Bioaccumulation of metals in Tilapia zillii from Badeni Dam, Côte d'Ivoire
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RB Tate --- Digby Wells Environmental, South Africa A Husted --- Digby Wells Environmental, South AfricaGiven the importance of fish as a source of protein and the potential for exposure of humans to metal elements, metal bioaccumulation concentrations in Tilapia zillii from four sites in the Badeni Dam on the Badeni River, Côte d'Ivoire, were... -
Lead accumulation in and its haematological effects on African catfish Clarias gariepinus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DH Ogbuagu --- Department of Environmental Technology, Nigeria ET Adebayo --- Department of Fisheries and Aquaculture Technology, Nigeria AA Ayoade --- Hydrobiology and Fisheries Unit, Department of Zoology, Nigeria OB Ugwu --- Department of Fisheries and Aquaculture Technology, Nigeria DO Mba --- Department of Fisheries and Aquaculture Technology, NigeriaYoung adult Clarias gariepinus exposed to 0.0015–0.1500 µg l−1 concentrations of lead (Pb2+) ions for 30 days were investigated for accumulations in muscle, gill, liver and heart tissues, as well as for the metal's effects on haemoglobin concentrations, erythrocytes sedimentation... -
Polycyclic aromatic hydrocarbons in water, sediment and fish from the Warri River at Ubeji, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MC Asagbra --- Ecology and Environmental Biology Research Unit, Department of Zoology, Nigeria AS Adebayo --- Cell Biology and Genetics Unit, Department of Zoology, Nigeria CI Anumudu --- Cell Biology and Genetics Unit, Department of Zoology, Nigeria OA Ugwumba --- Hydrobiology and Fisheries Research Unit, Department of Zoology, Nigeria AAA Ugwumba --- Hydrobiology and Fisheries Research Unit, Department of Zoology, NigeriaThe Warri River at Ubeji, Nigeria, receives pollutants from an oil refinery. The levels of 16 priority polycyclic aromatic hydrocarbons (PAHs) in water, sediment and the tissue of tilapia from the Warri River were investigated in 2010 using gas chromatography... -
First report on OH-PAHs in South African Clarias gariepinus bile from an urban impacted system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Water Research Group, Unit for Environmental Science and Management, South Africa N Bortey-Sam --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan Y Ikenaka --- Water Research Group, Unit for Environmental Science and Management, South Africa SMM Nakayama --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan H Mizukawa --- Department of Environmental Veterinary Science, Graduate School of Veterinary Medicine, Japan M Ishizuka --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan NJ Smit --- Water Research Group, Unit for Environmental Science and Management, South Africa R Pieters --- Water Research Group, Unit for Environmental Science and Management, South AfricaThe concentrations of selected hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) were determined in the bile of the African sharptooth catfish Clarias gariepinus from impoundments in the urban impacted Klip River system in Soweto, South Africa. Fish were sampled from three impoundments... -
An assessment of heavy metal accumulation in the Vaal River system, South Africa, using artificial mussels
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA Calaca --- University of the Witwatersrand, South Africa S Dahms-Verster --- University of the Witwatersrand, South AfricaThis study aims to identify metal concentrations around the Vaal River system by means of spot water sampling and the use of artificial mussels (AMs). Levels of Al, Cd, Co, Cr, Cu, Fe, Mn, Pb and Zn were determined at...