Hawaii ? Shark tours have become a popular visitor attraction in Hawaii, but a movement is gaining momentum to shut them down.

Some Native Hawaiians consider sharks to be ancestral gods and view feeding them for entertainment to be disrespectful of their culture. Surfers and environmentalists fear the tours will teach sharks to associate people with food — leading to an increase in attacks — while disrupting the ocean’s ecological balance. Federal fisheries regulators, meanwhile, are investigating the tours on the grounds that they are illegally feeding sharks.

The anti-shark tour movement ignited when residents noticed a large metal cage mounted on a boat at a marina in front of a popular Hawaii Kai restaurant in March. Oahu’s two shark tours used similar contraptions on the North Shore.