Here's a hint. Every fish has 2 names. The first name is the fin type. The second name is the body type.

For instance (this is not a real fish in Fish Tycoon, I just made this fish up to show you without spoiling you)... Threadfin Rainbowfish. Threadfin is the fin type... it's the kind of fins that you see on the fish. Rainbowfish is the body type. It's the kind of fish.

Let's see, if you played the game for a bit before you needed to have your computer fixed, you should have run across the fruitfish and the spotanus by now. they look pretty different, right? The fruitfish is a orange fish with black stripes. The spotanus is a white fish with spots and a stripe across its eye. Fruitfish and spotanus are body types.

Did that make sense?

And if anyone is curious, yes, Threadfin Rainbowfish is a real fish. It's from Irian Jaya, south of Papua New Guinea.

http://www.thetropicaltank.co.uk/Fishindx/iri-wern.htm