Alimentary disease damages industrial aquaculture with the adoption of highly intensive technologies of fish-farming (hatchery, basin, etc.). First group comprises disease related to unbalanced use of mixed feed as regards its composition of fats, proteins, carbo-hydrates, minerals and vitamins. Second group comprises disease occurring to fishes as a result of consumption of injurious feed, containing micro-organisms (bacteria or fungi), and products of their vital activity or containing oxidize