Science Visualized Animals These transparent fish turn rainbow with white light. Now, we know why Light gets diffracted by repeated structures in the ghost catfish’s muscles The ghost catfish (several shown) becomes iridescent when white light passes through its mostly transparent body. Nan Shi, Xiujun Fan and Genbao Wu Share this:EmailFacebookTwitterPinterestPocketRedditPrint By McKenzie Prillaman March 24, 2023 at 9:00 am The ghost catfish transforms from glassy to glam when white light passes through its mostly transparent body. Now, scientists know why. The fish’s iridescence comes from light bending as it travels through microscopic striped structures in the animal’s muscles, researchers report March 13 in the Proceedings of the National Academy of Sciences.