Cold water winter lesions in Atlantic salmon



Title Cold water winter lesions in Atlantic salmon
Author(s) J. O'Halloran, E. Saulnier, K. Were, David B. Groman, S. Lall
Journal Canadian Veterinary Journal
Date 1991
Volume 32
Issue 5
Start page 312
Abstract Severe ulcerative, necrotizing bacterial dermatitis, panniculitis and myositis occurred in at least 6 Atlantic salmon cage sites in New Brunswick in 1990. Mortality was due to invasion by opportunistic bacteria, or osmotic failure due to excessive ulceration. Mortality up to 10% on individual cages occurred, compared to the normal rate of 0.53% in other cages and other environments during the same 3-month period. Histological examination of lesions collected in early March, when water temperatures were 1 degrees C and food consumption was 0.2% of body wt per day, showed no evidence of healing response. Filamentous gram-negative rods were found in impression smears of all lesions, but bacteria could not be cultured, In March, in an attempt to stimulate healing, the vitamin C content of the diet was increased from 600 mg/kg of feed to 3000 mg/kg. Healing was not observed until April 30, but this also corresponded with water temperatures that rose above 4 degrees C on April 30. Other factors involved in wound repair are discussed briefly..

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