Known as a center of the goldfish industry, the city of Yatomi, Aichi Prefecture, is exploring a medical spinoff from the bubble eye goldfish.

Experts believe the fluid in sacs beneath the eyes could be a cell growth stimulant with valuable uses in medical research.

The research is being conducted at the Aichi Fisheries Research Institute's inland water fisheries research center, which has a tuition center in Yatomi.