Abstract
Fish are perhaps one of the most highly parasitized of animal groups, and the unnatural crowding which occurs in hatcheries and aquaria favours the greatly increased possibility of heavy infestation by some parasites. Such hazards have been recognised in freshwater fishes for some time (see, for example, Dogiel, Petrushevski & Polyanski, 1961), and diseases of marine fishes are now beginning to receive increasing attention (Sindermann, 1966).

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