H. H. Preez

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Concentrations of zinc in Barbus marequensis from the lower Olifants River, Mpumalanga, South Africa

J. J. Vuren, T. Seymore, H. H. Preez, 1996, Hydrobiologia.

Bioaccumulation of aluminium, copper, iron and zinc in the tissues of the moggel from Witbank Dam, Upper Olifants River Catchment (Mpumalanga)

J. J. Vuren, H. H. Preez, G. Nussey, 1999 .

Bioaccumulation of copper and zinc in Oreochromis mossambicus and Clarias gariepinus, from the Olifants River, Mpumalanga, South Africa

J. J. Vuren, H. H. Preez, P. Kotzé, 1999 .

Bioconcentration of atrazine, zinc and iron in the blood of Tilapia sparrmanii (Cichlidae).

J. J. Vuren, H. H. Preez, Eurika van Heerden, 1991 .

Application of the equilibrium partitioning method to derive copper and zinc quality criteria for water and sediment: a South African perspective.

V. Wepener, J. J. Vuren, H. H. Preez, 2000 .

Bioconcentration of atrazine in the banded tilapia, Tilapia sparrmanii.

J. J. Vuren, H. H. Preez, 1992 .

METAL RESIDUES IN TISSUES AND FOOD OF A JUVENILE PURPLE HERON, ARDEA PURPUREA (ARDEIDAE)

H. H. Preez, P. V. Eeden, H. J. Schoonbee, 1996 .

Manganese, lead and strontium bioaccumulation in the tissues of the yellowfish, Barbus marequensis from the lower Olifants River, Eastern Transvaal

J. J. Vuren, T. Seymore, H. H. Preez, 1995 .

Metal concentrations in Clarias gariepinus and Labeo umbratus from the Olifants and Klein Olifants River, Mpumalanga, South Africa: zinc, copper, manganese, lead, chromium, nickel, aluminium and iron

Liza Coetzee, J. J. Vuren, H. H. Preez, 2002 .

Monitoring cadmium and zinc contamination in freshwater systems with the use of the freshwater river crab, Potamonautes warreni

J. J. Vuren, H. H. Preez, M. Sanders, 1999 .

Effect of manganese and iron at a neutral and acidic pH on the hematology of the banded tilapia (Tilapia sparrmanii)

V. Wepener, J. J. Vuren, H. H. Preez, 1992, Bulletin of environmental contamination and toxicology.

Effect of copper on the differential white blood cell counts of the Mozambique tilapia (Oreochromis mossambicus)

J. J. Vuren, H. H. Preez, G. Nussey, 1995 .

Toxic effects of zinc and iron on the routine oxygen consumption of Tilapia sparrmanii (Cichlidae)

J. J. Vuren, H. H. Preez, Eurika Grobler, 1989 .

Bioaccumulation of manganese in selected tissues of the freshwater crab, Potamonautes warreni (Calman), from industrial and mine-polluted freshwater ecosystems

H. Schoonbee, H. H. Preez, P. V. Eeden, 1994, Hydrobiologia.

Effect of copper on the haematology and osmoregulation of the Mozambique tilapia, Oreochromis mossambicus (Cichlidae)

J. J. Vuren, H. H. Preez, G. Nussey, 1995 .

Bioacciimulation of copper in the tissues of Potamonautes warreni (Calman) (Crustacea, Decapoda, Branchiura), from industrial, mine and sewage-polluted freshwater ecosystems

H. Schoonbee, H. H. Preez, V. E. Steenkamp, 1994 .

Bioaccumulation of chromium and nickel in the tissues of Barbus marequensis A. Smith, 1841 from the Lower Olifants River, Mpumalanga

J. J. Vuren, T. Seymore, H. H. Preez, 1996 .

The effect of copper on the blood chemistry of Clarias gariepinus (Clariidae).

M. V. D. Merwe, J. J. Vuren, H. H. Preez, 1994 .

Variations in selected water quality variables and metal concentrations in the sediment of the lower Olifants and Selati rivers, South Africa

A. Deacon, J. J. Vuren, T. Seymore, 1994 .

The effect of hexavalent chromium at different pH values on the carbohydrate metabolism of Tilapia sparrmanii (Cichlidae)

J. V. Vuuren, V. Wepener, H. H. Preez, 1992 .

Uptake and distribution of a copper, iron and zinc mixture in gill, liver and plasma of a freshwater teleost, Tilapia sparrmanii

V. Wepener, J. J. Vuren, H. H. Preez, 2004 .

A comparison of growth performance and genetic traits between four selected groups of African catfish (Clarias gariepinus burchell 1822)

H. H. Preez, J. P. Grobler, F. H. Bank, 1992 .

A comparative biochemical genetic study of three populations of domesticated and wild African catfish (Clarias gariepinus)

H. H. Preez, J. P. Grobler, F. H. Bank, 1992 .

Preliminary laboratory investigation of the bioconcentration of zinc and iron in selected tissues of the banded tilapia, Tilapia sparrmanii (Cichlidae)

E. Rensburg, J. J. Vuren, H. H. Preez, 1993 .

Notes on the induced reproduction and development of the tigerfish,Hydrocynus vittatus (Characidae), embryos and larvae

A. Deacon, G. Steyn, H. H. Preez, 1996, Environmental Biology of Fishes.

Acute toxicity tests of copper on juvenile Mozambique tilapia, Oreochromis mossambicus (Cichlidae), at different temperatures

J.H.J. van Vuren, H. H. Du Preez, Gail Nussey, 1996 .

Tooth replacement of tigerfish Hydrocynus vittatus from the Kruger National Park

G. Steyn, H. H. Preez, C. L. Gagiano, 1996 .

Effects of chromium during pH change on blood coagulation in Tilapia sparrmanii (Cichlidae).

Marina Gey van Pittius, J. J. Vuren, H. H. Preez, 1992 .

Routine oxygen consumption of Tilapia sparrmanii (cichlidae) following acute exposure to atrazine

J. J. Vuren, H. H. Preez, Eurika Grobler, 1989 .

The influence of suspended silt on oxygen consumption by the redbreast tilapia, Tilapia rendalli (Boulenger,1896)

G. Steyn, H. H. Preez, Y. Buermann, 1996, Hydrobiologia.

A preliminary investigation of the concentration of selected metals in the tissues and organs of the tigerfish (Hydrocynus vittatus) from the Olifants River, Kruger National Park, South Africa

G. Steyn, H. H. Preez, 1992 .

Suspended silt concentrations in the lower Olifants River (Mpumalanga) and the impact of silt releases from the Phalaborwa Barrage on water quality and fish survival

A. Deacon, G. Steyn, H. H. Preez, 1995 .

Note on the occurrence of selected trace metals and organic compounds in water, sediment and biota of the Crocodile River, Eastern Transvaal, South Africa

D. Roux, G. Steyn, J. Badenhorst, 1994 .

Bioaccumulation of zinc and lead in selected tissues and organs of the freshwater crab, Potamonautes warreni

H. Schoonbee, H. H. Preez, V. E. Steenkamp, 1993 .

The development of an aquatic toxicity index as a tool in the operational management of water quality in the Olifants River (Knsger National Park)

Victor Wepener, Norbert Euler, V. Wepener, 1992 .

The effect of hexavalent chromium at different pH values on the haematology of Tilapia sparrmanii (Cichlidae).

V. Wepener, H. D. du Preez, J. van Vuren, 1992, Comparative biochemistry and physiology. C, Comparative pharmacology and toxicology.

The implementation of an aquatic toxicity index as a water quality monitoring tool in the Olifants River (Kruger National Park)

V. Wepener, H. H. Preez, J. Vuren, 1999 .