Bindi urged viewers to log into seaworldkids.com
"I'm thrilled to be partnered up with SeaWorld," Bindi said.
"Thrilled to be part of this new project Generation Nature and just encouraging kids to change the world."
The announcement set off an avalanche of angry Twitter posts, with one opponent, Amanda Holliday, Tweeting: "How much do you think #SeaWorld had to pay Bindi Irwin to try to fix their image?"
Another from Pat Fitzgerald read: "@BindiIrwin Have you seen #Blackfish? Please do not bring shame to your fathers name by colluding with #SeaWorld".
SeaWorld has launched an aggressive online and media campaign against the Blackfish documentary, including placing full-page ads in America's biggest-selling newspapers titled: "Open Letter from SeaWorld's Animal Advocates.
SeaWorld has also spent US$70 million (A$78 million) improving its killer-whale habitats the past three years.
SeaWorld, unrelated to the Queensland, Gold Coast, theme park Sea World, has parks in San Diego, Orlando and San Antonio.
- AAP