Well, of course, it can only mean one thing.
Or maybe one of two things.
"Star Trek IV: The Voyage Home" IMDb
"To save Earth from an alien probe, Admiral James T. Kirk and his fugitive crew go back in time to San Francisco in 1986 to retrieve the only beings who can communicate with it: humpback whales. ..."
So long, and thanks for all the fish. Wikipedia
"So Long, and Thanks for All the Fish is the fourth book of the Hitchhiker's Guide to the Galaxy 'cycle' written by Douglas Adams. Its title is the message left by the dolphins when they departed Planet Earth just before it was demolished to make way for a hyperspace bypass, as described in The Hitchhiker's Guide to the Galaxy. The phrase has since been adopted by some science fiction fans as a humorous way to say "goodbye" and a song of the same name was featured in the 2005 film adaptation of The Hitchhiker's Guide to the Galaxy. ..."