New Zealand Journal of Marine and Freshwater Research abstracts

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WHIRLING DISEASE IN NEW ZEALAND TROUT CAUSED BY MYXOSOMA CEREBRALIS (HOFER, 1903) (PROTOZOA: MYXOSPORIDA)

G. C. Hewitt

Zoology Department, Victoria University, Wellington, New Zealand

R. W. Little

Fisheries Division, Marine Department, Wellington, New Zealand

Abstract Examination of diseased rainbow trout (Salmo gairdneri) from a trout hatchery in New Zealand revealed spores of Myxosoma cerebralis. Fish also exhibited the typical signs of infection: "whirling" movements when disturbed, skeletal deformities and tail darkening. Records suggest that the disease may have been present for some years. A brief summary of the parasite's life cycle is given, and recommendations are made for legislation to reduce the possibility of its spread to other hatcheries and to reduce the risk of importing other disease organisms into New Zealand.

N.Z. Journal of Marine and Freshwater Research 6 (1 & 2) : 1-10
(Received for publication 25 January 1972)

PDF file of entire paper: medium quality (1050K); (scanned from paper original: notes about this process)

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