FIELD: veterinary medicine.;SUBSTANCE: invention refers to veterinary science, particularly to a composition for treating or preventing amebic diseases of gills in salmonid fish. Composition is characterized by that it represents an extruded fodder for fish with addition of arginine. Fodder contains protein, binder, fats, vitamins and minerals, and total content of arginine in fodder for fishes makes at least 3.0 % (wt. %) of total fodder weight.;EFFECT: using the invention enables treating and preventing amebic diseases of gills in fish.;5 cl, 10 dwg, 3 tbl, 6 ex
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