The groupers, fat and about two feet long, are not alone: Hundreds of gray reef sharks assemble as well, to stalk them. The female groupers, like other reef fish, spend at most a few days in the ...

A blacktip reef shark darted away as he tied off to a mooring. “This is a nursery for baby sharks.” Nohoarii is the owner of Kaimana Excursions, a Rangiroa-based tour company founded by his ...