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Cobus van Dyk

Professor, Head of Department
Name: Cobus van Dyk
Location: D3 Lab 225 Auckland Park Kingsway Campus
Zoology Academic Staff  Staff Members

Contact Details:
Tel: +27 (0)11 559 2620

Email: cvandyk@uj.ac.za

About Cobus van Dyk

Research overview:
My research is in the field of aquatic toxicology and fish health, with a special focus on histopathology and general toxicological pathology of freshwater fish. Current projects, including those of my postgraduate students, include fish health surveys in the polluted Roodeplaat Dam system, with emphasis on hepatic pre-neoplastic lesions, as well as fish health surveys in Rietvlei Nature Reserve, investigating the reproductive health of fish.


Recently completed laboratory exposure studies by my postgraduate students include investigations on the effect of Microcystin-LR on the liver pathology of Clarias gariepinus, the effect of Cadmium on the central nervous system of Oreochromis mossambicus, and the effect of effective micro-organisms on the general histology of Clarias gariepinus.


Lecture responsibilities:

  • Physiology 2B: Control systems
  • Zoology Honours: Fish Histology and Histopathology

Recent publications:

  1. Sihoka, C., Wagenaar, G.M., Van Dyk, J.C. (2024) Metal bioaccumulation and histological alterations in Oreochromis andersonii at Itezhi-tezhi Dam downstream of a mining area in the Central Province of Zambia. Environmental Toxicology and Pharmacology. Online. Environmental Toxicology and Pharmacology.
  2. Van Dyk, J.C., Nyoni, H., Barnhoorn, I.E.J. (2022). Hepatic nodular alterations in wild fish from a hyper-eutrophic freshwater system with cyanobacterial blooms: a species and seasonal comparison. Environmental Science and Pollution Research. 29(11) 15729 – 15742.
  3. Mabika, N., Barson, M., Dos Santos, Q.M., van Dyk, C., Avenant-Oldewage, A. (2022). Additional Taxonomic Information for Lamproglena hemprichii (Copepoda: Lernaeidae) Based on Scanning Electron Microscopy and Genetic Characterization, Alongside Some Aspects of Its Ecology. Zoological Science 40(1).
  4. Mabika, N., Barson, M., van Dyk, C., Avenant-Oldewage, A. (2022). Endohelminth parasites of male and female tigerfish, Hydrocynus vittatus (Castelnau, 1861), from the Sanyati basin in Lake Kariba. African Zoology 57(4).
  5. Webster, H.J., Emami-Khoyi, A., Van Dyk, J.C., Teske, P.R., Jansen van Vuuren, B. (2020). Environmental DNA Metabarcoding as a Means of Estimating Species Diversity in an Urban Aquatic Ecosystem. Animals 10(11): 2064.
  6. Barnhoorn, I.E.J., van Dyk, J.C. (2020). The first report of selected herbicides and fungicides in water and fish from a highly utilized and polluted freshwater urban impoundment. Environmental Science and Pollution Research. 27: 33393–33398.
  7. Modley, L., Rampedi, I., Avenant-Oldewage, A., van Dyk, J.C. (2020). A comparative study on the biotic integrity of three rivers supplying a polluted, hyper-eutrophic freshwater system: A multi-indicator approach. Ecological Indicators, 111: 105940. 
  8. Modley, L., Rampedi, I., Avenant-Oldewage, A., Nindi, M.M., Mhuka, V., van Dyk, J.C. (2019). Microcystin concentrations and liver histopathology in Clarias gariepinus and Oreochromis mossambicus from three impacted rivers flowing into a hyper-eutrophic freshwater system. Environmental Toxicology and Pharmacology, 71: 103222.
  9. Mabika, N., Barson, M., van Dyk, J.C., Avenant-Oldewage, A. (2019). Seasonal occurrence of metazoan parasites in Tigerfish, Hydrocynus vittatus Castelnau, 1861 (Characiformes: Alestidae) from Sanyati Basin, Lake Kariba, Zimbabwe. Onderstepoort Journal of Veterinary Research, 86(1): 1-8.   
  10. Lukhwareni, R., van Dyk, J.C. (2018). Histology and ultrastructure of hepatic nodular alterations in Clarias gariepinus (Burchell). Journal of Fish Diseases. 41(12): 1859-1870. 

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