[tropical fish club] Fish colors affected by light amounts

 

I was reading with interest last night the writings of Dr. Joanne Norton about how to get different color patterns in angelfish by raising them in darkness or only 4 or 8 hours of light, or constant light.

Some kinds of crayfish will become blue when raised in darkness.

Are there other kinds of fish that have different color patterns depending on the amount of light they are raised in?

I've heard that some gouramis get a lot more vivid colors when they are in sunlight (outdoors) and I've seen myself that bettas get richer colors when they are kept outdoors in the sun. Guppies also get some color enhancement from being outdoors, and they get a lot more active and alert.

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