Inhibition of epidermal migration in the skin of rainbow trout Salmo gairdneri Richardson in the presence of achromogenic Aeromonas salmonicida

Experimental infection of artificially‐induced skin ulcers in rainbow trout Salmo gairdneri Richardson with an achromogenic strain of Aeromonas salmonicida induced a syndrome similar to that observed in cyprinid fishes. Sequential histological observations showed that the presence of the bacteria completely inhibited any migration of peripheral epidermal cells and subsequent under‐running of the ulcer resulted in its expansion, as peripheral epidermis sloughed.