Researchers are diving deep to find out more about the ocean sunfish, the Jabba the Hutt of the fish world, that hang out on the reefs off Bali for just three months each year. They’ve become an intriguing tourist attraction for divers, but is this tourism sustainable?

The sunfish head to the reefs from July to October to seek out cleaner fish—such as longfin bannerfish and emperor angelfish— which help them remove skin parasites and clean up skin lesions.

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