Alimentary toxicosis can be caused in fishes by various substances that are introduced into mixed fodder through raw materials or form in the process of improper storage of mixed fodder. Toxic effect manifests either in death of fishes or in various pathological aberrations in their physical state. The document consists of 3 Secs. Section 1 lays down general provisions. Section 2 regards research of fishes. Section 3 regards research of fish feed.