A detailed microbiological and parasitological survey of salmonids and indigenous fish in the upper reaches of selected river systems in Natal was undertaken. Fish were collected from the rivers by electro-fishing, from dams by gill netting and from hatcheries along the rivers. A total of 678 fish from 26 different sites along 8 river systems were collected. No parasites could be detected on fish from four of the rivers tested. Parasites were, however, detected on fish from large production sites in Natal and in the rivers feeding these sites. Parasites which were detected were Ichthyopthirius multifiliis, various Trichodina spp., Apiosoma sp. and Gyrodactylus sp. The heads of all fish estimated to be less than one year of age were collected and examined for the spores of Myxosoma cerebralis. All of the samples were found to be free of this parasite.
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