Spinning Tilapia (ST)
Iridovirus (110-140 nm)
Oreochromis mossambicus, O. aureus, O. niloticus, and Sarotherodon galilaeus
Affected tilapia fry and fingerlings swim in a spiral pattern, sink to the bottom then rise and hang at a 45 degrees angle just under the water surface, gasping for air. They do not feed and are darker in color.
EFFECT ON HOST:
Tilapia manifesting the spinning syndrome die within 24 h of onset. Up to 100% mortality in affected population of Tilapia fry has been reported. Histo-pathologically, the renal tubules are shrunken, hemorrhaging and infiltrated with eosinophilic granular cells. In addition, focal myolysis develops in the muscles.
The disease is detected by signs of the disease, EM, isolation/identification of the virus.