Hi there, how many colors you want to use?

Lots, however the four trout types can be depicted in a cartoonish sort of way, which is probably more realistic for a t shirt... the rainbow should have green/silver with black dots and a bit of pink, the brook trout has blue halos with red around them, the tiger trout is orangeish brown with black tiger markings and the brown trout is brown with redish/brown spots.. look at the example I provided.. it shows each species.. so I'm looking for a cartoon version of that.

Use as many colours as is necessary.

Ok. thx for your replay! i'm working on it :)

Sweet! If you're on the right track I will provide lots of feedback to make it perfect.