DESCRIZIONE
Composition for treatment of mucus on fish gills for a therapeutic or a prophylactic treatment of an amoebic gill disease in fish, where the composition comprises an ex- truded fish feed supplemented with arginlne; said fish feed comprising protein, binder, fat, vitamins and minerals; and a total arginine content of the fish feed is at least 3.0% (wt/wt) of a total feed weight.