Striped bass (Morone saxatilis) juveniles raised in an intensive culture system had chronic mortality resulting from infections with Mycobacterium marinum. Approximately one-half of a population of 900 yearlings succumbed to the disease and 80% of those remaining were infected. The bacteria were isolated on Petrignani's medium after 7 days at 25 C and subcultures grew at temperatures from 20 to 37 C. The disease was characterized by systemic nodular lesions in all major organs. Older tubercles contained numerous acid-fast bacilli. Chemotherapy by feeding rifampin (6 mg/100 g of food for 60 days) was not an effective treatment. Subclinical mycobacteriosis in adult striped bass may be the source for vertical transmission to their progeny.
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1 July 1987
MYCOBACTERIOSIS IN CULTURED STRIPED BASS FROM CALIFORNIA
R. P. Hedrick,
T. McDowell,
J. Groff
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Journal of Wildlife Diseases
Vol. 23 • No. 3
July 1987
Vol. 23 • No. 3
July 1987
aquaculture
Morone saxatilis
mycobacteriosis
Mycobacterium marinum
striped bass