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Color changes physiology

Posted By: Chisky
Date: Friday, 3 August 2001, at 7:31 a.m.

When a fish changes color how does he do it? Is it a hormonal reaction? Or do they think, There is a light substrate think I'll go beige today?
Or is it external, like an optical reaction to the reflection of light variance in a tank by the person looking at them.


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