I know there have been a couple of threads on visiblity and if halibut / lingcod are line shy...I think we have all ageed that they are not usually line shy but there is some anticdotal evidence that they to have color preferences on jig tails etc. If it is dark down there why would that be the case??
Here is an article that explains the penetration of UV light to 200 METERS! The problem is that we tend to think of vision as it applies to humans. Fish, halibut in particular can see at depth. Since that is the case, color choice can matter. the article is longer and more technical that is necessary for me to understand that in fact my favorite bottom fish can see in 300 feet of water, just like it is daytime to us.