From The Guardian: https://www.theguardian.com/travel/2019/oct/02/tripadvisor-ends-ticket-sales-to-attractions-that-breed-captive-whales-and-dolphins
TripAdvisor has announced it will not sell tickets to attractions that breed or import captive whales and dolphins used for public display. The travel site has confirmed the move will affect major attractions that include SeaWorld’s theme parks.
TripAdvisor and its subsidiary, Viator, will end commercial relationships with facilities that do not have, or are not in the process of developing, alternative environments for captive cetaceans, which includes whales, dolphins and porpoises.
“They would have to have made a public commitment either to cease all breeding and importation of cetaceans for display with immediate effect or to develop alternative models, such as seaside-sanctuary environments, for the population of captive cetaceans already in their care,” said James Kay, director of corporate communications for TripAdvisor.
The new policy should be in full force by the end of the year. The Article goes on to contrast the approach of Sea World, with the National Aquarium in Baltimore, who's sanctuary has gotten the thumbs up from Tripadvisor.
The attractions will still be listed for reviews on Tripadvisor.