A5018878977- Fish Ecology and Management Studies
- Environmental Toxicology and Ecotoxicology
- Reproductive biology and impacts on aquatic species
- Pharmaceutical and Antibiotic Environmental Impacts
- Fish Biology and Ecology Studies
- Effects and risks of endocrine disrupting chemicals
- Aquaculture Nutrition and Growth
- Sperm and Testicular Function
- Toxic Organic Pollutants Impact
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Aquatic Ecosystems and Biodiversity
- Wildlife Ecology and Conservation
- Aquaculture disease management and microbiota
- Child Nutrition and Water Access
- Air Quality and Health Impacts
- Pharmacological Effects and Toxicity Studies
- Bat Biology and Ecology Studies
- Microplastics and Plastic Pollution
- Soil and Water Nutrient Dynamics
- Comparative Animal Anatomy Studies
- Animal Genetics and Reproduction
- HIV/AIDS drug development and treatment
- HIV Research and Treatment
- Freshwater macroinvertebrate diversity and ecology
- Biological Research and Disease Studies
University of Venda
2015-2025
University of Limpopo
2024
University of the Free State
2021
Sewanee: The University of the South
2019
University of Pretoria
2004-2013
Abstract This is the first histological evidence of intersex in a fish species inhabiting South African water source. One hundred catfish ( Clarias gariepinus ) were collected randomly from Marais Dam (MD) and Rietvlei (RVD) Nature Reserve (RNR), Africa. These dams drain stream that receives effluent industrial sites, agricultural activities, informal settlements, municipal treatment plants. Each was evaluated macroscopically had blood drawn, its gonads histologically examined to verify...
Background: Africa faces a number of unique environmental challenges. Unfortunately, it lacks the infrastructure needed to support comprehensive studies that could provide scientific basis inform policies. There are known sources endocrine-disrupting chemicals (EDCs) and other hazardous in Africa. However, coordinated approach identify monitor these contaminants develop strategies for public health interventions has not yet been made. Objectives: This commentary summarizes evidence presented...
Pharmaceutical pollution of surface waters has emerged as a significant environmental health concern worldwide. In this study, we investigated the presence and concentration pharmaceuticals in aquatic environments within Vhembe District Municipality, South Africa. To achieve this, grab samples water were collected from various locations across Thulamela Local Municipality encompassing rivers, streams, dams. A targeted solid-phase extraction method with ultra-high-pressure liquid...
Pollution of aquatic ecosystems is rising due to anthropogenic activities, with developing countries facing severe water contamination inadequate wastewater treatment, and limited access clean water. This study investigates microbial in the Nandoni Dam, Thate Vondo Albasini Xikundu Weir (Limpopo province), Orlando Dam (Gauteng province) South Africa. Water quality was determined using possible human physical parameters, pathogenic indicators (Total coliforms (TC) Escherichia coli (E. coli)....
Abstract There is a need for sensitive bio‐monitoring tools in toxicant impact assessment to indicate the effect of toxicants on fish health polluted aquatic ecosystems. Histopathological tissue allows early warning signs disease and detection long‐term injury cells, tissues, or organs. The aim this study was assess degree histopathological alterations liver C. gariepinus from two dams an urban nature reserve, (Gauteng, South Africa). Two (Dam 1 Dam 2) were chosen their suspected levels...
Histopathological changes were identified in selected target organs from two freshwater fish species, Clarias gariepinus and Oreochromis mossambicus, inhabiting the hyper-eutrophic Roodeplaat Dam near Pretoria. A histology-based health assessment protocol was used, including a semiquantitative histopathological of gills, liver, ovaries, testes, kidney heart. Water quality analyses showed variables to be above recommended levels, pH, ammonia, nitrogen, chloride phosphorus. number alterations...
A semi-quantitative histological assessment was used to investigate changes in the gills of Clarias gariepinus from Marais Dam and Rietvlei near Pretoria, which receive effluent sewage treatment plants industries, as well runoff informal settlements. Results were compared those a laboratory-bred reference group offish. Histological alterations prevalent fish both impoundments, including circulatory disturbances such telangiectasia epithelial lifting, hyperplasia mucous cells between...
The effects of DDT and its metabolites on the reproductive health two fish species (Clarias gariepinus Oreochromis mossambicus) were studied using gonadosomatic index (GSI), gonadal histology computer assisted sperm analysis (CASA). metabolites, DDE DDD are endocrine disrupting chemicals posing estrogenic anti-androgenic properties, which have detrimental growth reproduction. Although was banned internationally, it is still used for Malaria vector control in areas South Africa. Both sampled...
Stream flow weirs disrupt river regimes, physical conditions, and biological composition of rivers, posing significant threat to the river’s functionality, integrity, sustainability. Home diverse aquatic organisms, there is a lack impact assessment on stream Luvuvhu River Catchment (LRC). The aim this study was examine six macroinvertebrate assemblages across five streams. A total sampling surveys macroinvertebrates physico-chemical parameters were conducted upstream downstream in 12 months...
Fish from two urban impoundments known to be polluted will have a higher incidence of gonadal histological alterations compared fish grom laboratory-bred referende group. The aim the study was examine possible reproductive health effects in male and female Clarias gariepinus, based on assessment, compare results reference group (RG). Previous studies shown both gills livers catfish inhabiting these systems; water sediment analyses indicated levels selected endocrine disrupting chemicals...
Sperm motility and testicular histology were studied as reproductive indicators of the capacity for two wild, indigenous fish species (Oreochromis mossambicus Clarias gariepinus) from a currently DDT sprayed area in South Africa. An important component health is an optimally functioning system. Computer assisted sperm analysis (CASA), based on open-source software, was used to assess parameters including percent motile (% MOT), velocity curvilinear (VCL μm s−1) progression (PROG). Both...
Efavirenz is an antiretroviral drug (ARV) used for the treatment of Human Immunodeficiency Virus (HIV/AIDS) infections. The effects efavirenz may have on mammals known, however, little known about non-target aquatic organisms, especially growth and development fish. Adult Oreochromis mossambicus were bred to produce newly fertilised eggs. These eggs exposed using two concentrations (10.3 ng/L 20.6 ng/L) over 60 days period. growing juveniles kept in a static renewal system under controlled...