Various Sulfonamide Treatments of Furunculosis in Brook Trout, Salvelinus Fontinalis

Abstract

Abstract Sulfamerazine, sulfamethazine, sulfathiazole, and sulfamerazine alternated at 4-day intervals with sulfathiazole, were compared in the treatment of furunculosis among yearling and fingerling brook trout at the Leetown Station of the U. S. Fish and Wildlife Service, Kearneysville, West Virginia, in 1947. The daily dosage rates were: for sulfamerazine and sulfamethazine, 6 grams per 100 pounds of fish (13.2 grams per 100 kilograms); for sulfathiazole, 12 grams per 100 pounds. The drugs were mixed thoroughly with the food. The courses of the epizootics were very different in the two age groups. With yearlings, mortalities were as follows: controls, 100 percent; sulfathiazole, 75 percent; sulfamethazine, 62 percent; sulfamerazine-sulfathiazole, 43 percent; sulfamerazine, 29 percent. With fingerlings, treatment was initiated sooner after the onset of the disease. Although mortality was finally heavy in the fingerling control, sulfonamide therapy was very much more effective and losses correspondingly ...