I find color plays a big role for the fishing I do. I fish for Atlantic Salmon and it seems light orange and brown (hackled Flies) are the most productive colors for dry flies primerly Bombers, on the Rivers I frequent. That being said other rivers seem more productive with green or Black. Fly size and presentation still are the most important factors, but in my 30+ years of fishing color also adds and advantage. I am not sure if it is the actual color or the silouette it creates for the fly itself that is the answer. Interesting topic though...

JK