Recently, new viral diseases associated with mass mortalities have been recorded among hatchery-reared larvae and juveniles of marine fish such as Japanese parrotfish (Oplegnathus fasciatus)1) , barramundi (Lates calcarifer) 2 ,3) and turbot (Scophthalmus maximus)4), all of which seem to have a similar viral etiology. These diseases were characterized by the affected central nervous system with picorna-like vi ruses; however the viral etiology has not been established yet mainly due to the unsuccessful isolation of the virus. This paper describes a similar viral disease among hatchery-reared larvae and juveniles of redspotted grouper, Epinephelus akaara.
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Mori et al. (1991) studied this question.