HONOLULU (AP) — Federal regulators are proposing to ban swimming with dolphins in Hawaii, a move that could imperil one of the Aloha State's most popular tourist activities and the industry that has sprung up around it. The National Marine Fisheries Service says spinner dolphins — the playful nocturnal species that humans in Hawaii routinely frolic with — are being deprived of rest during the day and becoming stressed out. Swimming with dolphins is popular with visitors and some locals, with dozens of companies on Kauai, Oahu, Maui and the Big Island operating dolphin tours daily. There has to be a middle ground between the dolphin tour operators and what federal regulators are proposing, said Richard Holland, CEO of Dolphins and You, which takes about 80 customers on tours to waters off Oahu's Waianae Coast each day. Ann Garrett, assistant regional administrator of the National Marine Fisheries Service's protected resources division for the Pacific Islands, said dolphins have been found to be burning calories at a higher rate because they are forced to be vigilant as people approach their pods. The federal agency plans to hold public meetings on the regulations next month and expects to make a final decision next year.