Immune response of U.D.N.‐infected salmon to Saprslegnia

Abstract
Sera from salmon Sulnio salar L. suspected of U.D.N.‐infection were tested (by double gel diffusion) against antigens prepared from diseased salmon tissues and Suprolegniu. Precipitating antibodies to the fungus were found in 93 % of the salmon, but only 66% of these fish were colonized by fungus. The antibodies were detected in parr and adult salmon.