When the bacterium
was delivered intraperitoneally or by bath
exposure, high levels of mortality were observed
within the first 48 h. Rapid mortalities occurring after
exposure to Streptococcus spp. have been reported
from other experimentally infected fish (Boomker et al.
1979, Minami et al. 1979). Foo et al. (1985) reported a
similar pattern in the outbreak of streptococcosis in
cultured rabbit fish, where fish died rapidly before
showing any clinical signs of the disease