Business Notes RESORTS

From the moment Hyatt's fantasy-filled $360 million Regency Waikoloa hotel opened on Hawaii last year, one of its most popular attractions was a high- tech lagoon containing eight bottle-nosed dolphins. Guests signed up for 30-minute sessions of cavorting with the gregarious 300-lb. mammals. Then ; tragedy struck: two of the dolphins suddenly died, prompting speculation that their demise might have been caused by abuse or infection from human playmates.

Last week an autopsy report disclosed that the dolphins had suffered lethal doses of food poisoning from eating fish contaminated by naturally occurring marine toxins. The fish had invaded the dolphins' domain through inlets connecting the lagoon to the ocean. The inlets have now been sealed to protect the surviving dolphins.