"A research project begun last summer placed ordinary brown-red Louisiana crawfish in aquaria at the Aquaculture Center. Four months later, more than 60% had turned a vivid blue. Researchers say it may be a form a camouflauge, since the crawfish were in a blue tank. The project was designed to determine whether the amount of light crawfish are exposed to affects their growth. The color change, Delabbio says, was a complete surprise."