Well my original like is not working still, but here are a few of the indications that fish do see colors and are not color blind. Lots of great info on these links for you to come to your own decision.
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Fish See in Colors

You may have to hit the back button to read this one since it auto moves on.
Do fish see color? An article by Lynn Ensley

Ah, here is the one that talks about the rods and cones...
Do Fish See in Color

Fishing Lures/Fish of the Great Lakes by Wisconsin Sea Grant

What do fish see?

Make your own decisions on what you believe, but if you read all of these I would think you may have more sight into this, LOL!