Publication Abstract

Myxidium gada, Georgévitch, 1916 infections in saithe, Pollachius virens L. from the North Sea

P. Koski, B.J. Hill, K. Way, E. Neuvonen and P. Rintamaki

In 1987 an outbreak of disease occurred in a single tank of brown trout (Salmo trutta m. lacustris (L.)) fingerlings at a freshwater fish farm in northern Finland. Mortalities in the affected tank began in August when the water temperature was 16°C and continued for about one month thereafter. The accumulative mortality reached 2.2% compared with only 0.2-0.9% in the 7 other tanks containing brown trout fingerlings at the farm.

Moribund fish were dark and lethargic and swam near the outlet of the tank. On post-mortem examination, the liver was seen to be coloured mustard-yellow, the kidney was bright red or greyish-red, and in some of the fish, intra-muscular haemorrhages were visible.

Reference:

P. Koski, B.J. Hill, K. Way, E. Neuvonen and P. Rintamaki, 1992. Myxidium gada, Georgévitch, 1916 infections in saithe, Pollachius virens L. from the North Sea. Bulletin of the European Association of Fish Pathologists, 12(5): 117