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Studies on ulcerative dermal necrosis of salmonids
Author(s) -
Roberts Ronald J.,
Ball H. J.,
Munro A. L. S.,
Shearer W. M.
Publication year - 1971
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1971.tb03666.x
Subject(s) - biology , dermis , necrosis , epithelium , anatomy , histopathology , malachite green , fish <actinopterygii> , regeneration (biology) , pathology , fishery , microbiology and biotechnology , genetics , medicine , chemistry , organic chemistry , adsorption
Fourteen fresh run salmon Satmo salar L. with early extant lesions of ulcerative dermal necrosis (UDN) were kept in separate tanks and treated with zinc free malachite green. Ten of the fish were held at 10° C and 4 at 2° C. The treatment precluded infection with Saprolegnia fungus and allowed natural resolution of the lesions. There was a marked difference in rate of healing between warm and cold water conditions. Histological examination of healing lesions at different stages showed that there was a primary invasion of cuboidal epithelium over the collagen scar followed by a phase of disorganized proliferation which eventually organized itself into normal epithelium. Melanocytes were very obvious in the dermis of healing lesions.