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Not AvailableJust as in the husbandry of land animals or in the production of agricultural crops, disease occurs in the culture of fishes and shellfishes. The problem of diseases has assumed considerable significance with the rapid developments that are now occurring in the culture of aquatic species. New diseases are occurring in intensive culture systems, whether they are under experimental conditions or in grow out systems, and unless we have a sufficient knowledge of the nature of these diseases and their control, aquaculture practices can hardly become successful. An attempt is made here to define disease and pathogen, and different categories of diseases.Not Availabl