The Ministry of Fisheries said these areas were affected by the ashfall after the volcano eruption on January 15.
It said it received reports of people getting sick after consuming shellfish from these areas. Fish in these coastal areas could also be at risk, it said.
Kaniva News reports victims included people who suffered from diarrhoea, vomiting, and having pain in various parts of the body at the same time.
The Ministry said fish from deep sea fishing could be safe for consumption.
