From the Greek Epi - on, zoon - animal, logos - science, concept.

Epizootology is the science that studies the causes, development and spread of mass disease in fish.

The science of epizootics, the manifestation of the epizootic process in which infection affects a large number of animals, studies the objective regularities of the emergence, manifestation, spread and extinction of epizootics (infectious diseases) and, on this basis, develops methods of prevention and control measures.