You can see right through this little aquarium fish from Thailand: Its skin is almost completely transparent.
Now, scientists have figured out how this fish — called the ghost catfish — creates its iridescent glow.
The ghost catfish — sometimes known as the glass catfish — is a small species native to rivers in Thailand, averaging just a few inches long. It’s sold around the world as an aquarium fish. But the ghost catfish has no scales, said senior author Qibin Zhao, a physicist at China’s Shanghai Jiao Tong University, who became fascinated by the fish after seeing it in an aquarium store.
And the very see-through skin, which lets in around 90% of outside light, is essential: “We wouldn’t be able to see the colours if the skin of the fish is not so transparent,” Zhao said in an email.
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