iPhone and iPad apps tagged "pet fish."
3D Aquarium: Dive into a Peaceful Underwater World of Virtual Pets
3D Aquarium — The great thing about having a pet is the interaction — the petting, funny expressions and playtime. So, I’m usually not too keen on the world of virtual pets and the related iPhone apps.
Freshwater Aquarium. Feed the Fish in your iPhone
Freshwater Aquarium is a cute app that replicates an aquarium with fish on your iPhone. Like Koi Pond, its not likely that you will use Freshwater Aquarium a lot, but at $0.99 its cute enough to marginally justify the cost of entry.