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I'm not sure I buy into the sunlight thing too much anymore. The numbers of fish I saw on the Nantucket flats last fall during peak sunlight makes me think that they will tolerate it if their food is there. The water is crystal clear and they were in water as shallow as a foot and half deep or so. And those fish seemed pretty comfortable as they just cruised around.
These weren't small fish either with the majority between 30-40", and several well into the 20lb range.
I grew up believing that fish avoid bright sunlight, but over the past couple years up here and in Florida I've seen alot of fish in very skinny water in very bright sunlight.
I think they use the cover more along the lines of the ambush point and maybe safety from predators. Just my $.02.
As far as depth, I don't know alot about it, but its mostly a water temp issue with most fish, isn't it? I think the fish go where the temp and oxygen levels are optimal while staying close to their food source.
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