A trailer for Pixar’s hotly awaited sequel to "Finding Nemo" appears to allude to the film’s anti-captivity message. "Finding Dory," which stars Ellen DeGeneres as the voice of the eponymous character, contains scenes in which unhealthy-looking fish are seen in display tanks, while other marine critters are harassed by humans reaching into their enclosure and trying to grab them.

In the wake of the outrage caused by the 2013 documentary "Blackfish," which exposed the atrocious treatment of orcas at SeaWorld, cast members of Pixar’s new animated project hinted that the script would be adapted so as not to encourage viewers to visit theme parks with captive marine animals.

According to reports, the initial storyline ended with some of the film’s characters being sent to a SeaWorld-style marine park, but this was scrapped after the release of "Blackfish." Instead, the fish are now supposedly sent to an animal-friendly marine biology institute, where they are free to leave if they wish.

Speaking last summer, DeGeneres said she hoped the movie would help to spread the right kind of message about how marine wildlife should be treated: “I think that fish should be in the ocean, which is what this whole sequel is about: rehabilitation and putting them back in the ocean … And we have to protect our oceans.”

Since "Blackfish" helped to shed light on the damage that marine theme parks can do to some animals, SeaWorld has seen its profits tumble, received a ban on breeding captive orcas, and, most recently, announced that it is to end its live orca shows.