Fish Tycoon preview at 1-up.

"There have been tycoons of every kind in video games, like zoos, roller coasters, and railroads, but who would have thought people would want a game where you breed tropical fish? It's a simple concept, but Fish Tycoon (which was previously a popular PC download) invites players to decorate their tank, sell fish, and discover new breeds along the way."

Full Source: 1-up