Calling something a fact doesn’t make it true.
Via cinematic-orchestra.tumblr.com
It'll go paler, but not completely white. Fish produce pigment in response to light (like we do when we get a tan). But they also get some pigment from the food they eat, so even in left in the dark forever they wouldn't go white.
Flickr: cecilio_padilla / Creative Commons / Twitter: @OMGFacts