The Fish couch gag is the eighteenth couch gag of Season 24.
Instead of the living room, the couch, the rug, and the side table are made out of sea anemone that are underwater. The Simpson family, resembling a few undersea creatures, swim up to the couch and sit on it as usual. Homer is a flounder, Marge is an octopus, Bart is a clownfish, Lisa is a seahorse, and Maggie is a starfish.
Suddenly, Blinky, who appears to be larger than the family, shows up and eats all of them alive. After a couple of seconds, he burps at the camera as he swims towards it, thus going to the "Created By/Developed By" TV credits.