Virus isolation and neutralization test are too time consuming for diagnosis on fish viral diseases. Minimum mortality and prevention from following transmission are brought by proper and timely countermeasures. Therefore more rapid diagnosis of the viral diseases is desired strongly.
Several procedures developed in medicine for more rapid diagnosis are introduced here and some of them applied to the fish viral diseases are reviewed. Most rapid diagnosis was performed using direct fluorescent antibody technique of stamp smear preparation of IPN infected trout tissues. Enzyme antibody technique is hopeful having many advantages against fluorescent antibody technique. Further studies will be necessary to applicate some hopeful and available methods to the fish viral diseases.