Set in a heightened, cartoonish world, the show follows the inhabitants of a thriving fish-farm, and the Di-Carprios - a family of salmon, who dream of life upstream. Leo (the eldest daughter), sick of life stuck inside the tanks, galvanizes the clan of salmon, and initiates a mass escape through a hole in the borders. Meanwhile, the humans above land (a large group of zany scientists and fish farmers) realize there has been a breach of security and put an irresistible bounty price on salmon.
