A survey of external lesions on Atlantic tomcod from the St Lawrence River was carried out between mid-December 1992 and the end of January 1993 (n = 1674). Jaw ulcerations were observed in 3.8% of the fish. These ulcers were usually single, and located at the junction between the skin epidermis and oral mucosa. They progressed from shallow lesions to deep ulcers with pathological fracture of the facial bone secondary to osteitis. The aetiology of these lesions could not be determined. Fish with ulcers were generally older than those of the monitored spawning population. The reason for a higher prevalence in older tomcods is unknown, but decreased immune functions and healing capacity caused by ageing are suggested as potential predisposing factors.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of Fish Diseases|
|State||Published - Jan 1 1997|
ASJC Scopus subject areas
- Aquatic Science
- veterinary (miscalleneous)