How do fish see and navigate in murky water?

[Arbutis]

This is a subject that has been bugging me lately. After doing a bit of my own internet research I have come up with a lot of dead ends. Maybe someone here has other information about this subject.

I do some spearfishing from time to time as well as some underwater video. I frequently encounter murky (dirty, dingy, muddy, silty - whatever you want to call it) water in our lovely state of New Jersey. This obviously cuts a spearfishing outing or video session quite short. However, I know from my fishing experiences that they are still quite active and able to be caught in these types of water conditions.

A lot of the internet research turned up information about the lateral line, the sense of smell, electro-receptors, rods and cones, the different wavelengths of light and how it penetrates below the surface of the water and at depth, etc, etc - but that's not exactly what I'm looking for.

I may be searching for something that is unknown to us but what I'm trying to figure out is how fish can navigate and live their lives in water that is virtually opaque to the human eye. The bays and rivers in our area (and even the nearshore ocean most of the time) are perpetually murky - yet they are loaded with all kinds of fish an sea life. I shot some video the other day and could barely see a lure as it passed within 6 inches from my camera. Yet the fish can see, navigate, forage for food and live in this environment - day and night. It's got me thinking that their eyes must be specifically evolved to see through this murk. But how? and what do they actually see?

Well, just curious - in case anyone out there can shed some light on this perplexing question.