That's a great question RT!

Here's been my experience in freshwater. (I've spent very little in the salt)

For spring chinook, it seems chartruese is a great color. This may be because they are so far from spawning and still see the green end of the spectrum well.

For fall chinook red seems to work well. Could be because they are close to spawning and have already physically changed and see the red end of the spectrum.

One other thing. Silver isn't really a color. It reflects light. Light is the whole color spectrum. I would assume that silver would be good anytime, regardless of season, or condition of fish because they will see the end of the spectrum (light) which thier eyes have physically changed to see best.

This could also be a function that adapts them to spawning. Ever notice how almost all salmon turn a red color the closer to spawning they get? It makes perfect sense there eyes would physically change to see other fish to spawn with or defend against.

Also it makes sense to me that salmon would see greens and blues well in the ocean, because their forage base is typically that and a combo of silver. Another wonderful adaption?

Lastly, Green is one of the last colors of the spectrum visible in low light. Red is the first to go away in low light. So keep that in mind when fishing low light. Also, Black is always good to use in low light because it stands out against everything else in a fish's environment (black absorbs light) that is reflecting light and produces a stark contrast often more visable than a color that is reflecting light.

Good topic

Aaron