Interest in parasites of fishes has increased considerably over recent decades, due mostly to repeated human infections, via raw or semi raw fish, with larval forms of certain parasites. Apart from parasites hazardous to man, there is a large number of species, present in commercially caught and marketed fishes, that pose no threat to man, but decrease the market value of fish flesh. Sanitary and veterinary inspectorates often face a serious problem of how to get rid of the infected fishes. The current instructions, and guidelines for treating parasitized fishes cannot cover all cases of infestation. In order to be able to deal with fish parasites encountered, one has to recognize and identify them, then biology, life cycle, invasion pathways, relationships within food chains, and many other biological phenomenon pertaining to parasites. The present Encyclopedia fulfils all requirements including the host parasites relationships, the pathogenicity of the parasites, and the methods of treatment.
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