Wiiware game My Aquarium...how do you unlock new fish?

Question

We downloaded the wiiware game My aquarium last night and we were wondering if anyone knew how to unlock new fish. (It is very calming for our dogs and we were hoping to unlock the clownfish they show on the download page, they love nemo)

Answer 1

"There are a total of 40 fish to select from, although initially you'll only be able to pick from about 14 of them. The rest have to be unlocked by checking on your fish every day. If you want more exciting selections, you’ll have to clock up a few hours of play time. The fish move in a very realistic manner and look even better than those in Endless Ocean, which is pretty impressive when you consider that this is a WiiWare download."

This is taken verbatim from the source.