I think those smelt are generally quite silverish when alive. So would resemble the micro jig even more. I believe trout can see the different colours quite well. Sometimes a lure in one colour works and another gets completely ignored. Although at certain water depths certain colours completely disappear. I think red is the first one to fade and blue the last. I have been fishing with some trout egg imitations. Even different shades of orange can make a difference between getting a take or not. Interesting thought with the kayak hull. The kingfish never seemed to be much afraid of my green hull. From a distance, a white hull could be an advantage though as you're less visible against the sky.