Scientists Discover How a Kind of Fish Makes Colorful Light Appear
2023-03-16
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1The skin of a small fish from Thailand is almost completely clear.
2But when light shines through it, a shimmering rainbow of colors appear.
3Now, scientists have found out how this fish - called the ghost catfish - creates colorful light that is iridescent.
4Something iridescent shines with many different colors depending on how you look at it.
5That color comes from within the fish's body.
6Researchers reported their findings in a study published recently in Proceedings of the National Academy of Sciences.
7As light passes through the fish's skin, it hits very small structures in the muscle that turn light into a colorful spectrum.
8The ghost catfish, which is sometimes called the glass catfish, is a small fish native to rivers in Thailand.
9It averages just a few centimeters long.
10It is sold around the world as an aquarium fish.
11Other creatures are also iridescent, creating the rainbow effect when colors change when looked at from different sides.
12Usually, they have outer surfaces that reflect the light, like a hummingbird's feathers or a butterfly's wings, said Ron Rutowski.
13He is a biologist at Arizona State University who was not involved with the research.
14The ghost catfish have no scales, said writer Qibin Zhao.
15He is a physicist at China's Shanghai Jiao Tong University.
16Zhao became very interested in the fish after seeing it in an aquarium store.
17Instead, it has structures in its muscles.
18These are what turns light into rainbow colors.
19Researchers made the discovery after shining different kinds of light and lasers onto the fish in a laboratory.
20As the ghost catfish swims, its muscles move, resulting in reflections of many colors.
21The fish's clear skin lets in around 90 percent of outside light.
22"We wouldn't be able to see the colors if the skin of the fish is not so transparent," Zhao said in an email.
23Some species use their iridescence to attract mates or give off warning signals.
24It is not clear whether the ghost catfish's colors serve a purpose, Rutowski said.
25I'm Dan Novak.
1The skin of a small fish from Thailand is almost completely clear. But when light shines through it, a shimmering rainbow of colors appear. 2Now, scientists have found out how this fish - called the ghost catfish - creates colorful light that is iridescent. Something iridescent shines with many different colors depending on how you look at it. 3That color comes from within the fish's body. Researchers reported their findings in a study published recently in Proceedings of the National Academy of Sciences. As light passes through the fish's skin, it hits very small structures in the muscle that turn light into a colorful spectrum. 4The ghost catfish, which is sometimes called the glass catfish, is a small fish native to rivers in Thailand. It averages just a few centimeters long. It is sold around the world as an aquarium fish. 5Other creatures are also iridescent, creating the rainbow effect when colors change when looked at from different sides. Usually, they have outer surfaces that reflect the light, like a hummingbird's feathers or a butterfly's wings, said Ron Rutowski. He is a biologist at Arizona State University who was not involved with the research. 6The ghost catfish have no scales, said writer Qibin Zhao. He is a physicist at China's Shanghai Jiao Tong University. Zhao became very interested in the fish after seeing it in an aquarium store. 7Instead, it has structures in its muscles. These are what turns light into rainbow colors. Researchers made the discovery after shining different kinds of light and lasers onto the fish in a laboratory. As the ghost catfish swims, its muscles move, resulting in reflections of many colors. 8The fish's clear skin lets in around 90 percent of outside light. 9"We wouldn't be able to see the colors if the skin of the fish is not so transparent," Zhao said in an email. 10Some species use their iridescence to attract mates or give off warning signals. It is not clear whether the ghost catfish's colors serve a purpose, Rutowski said. 11I'm Dan Novak. 12Dan Novak adapted this story for VOA Learning English based on reporting by The Associated Press. 13____________________________________________________________________ 14Words in This Story 15shimmer - v. to shine with a light that appears to move around 16iridescent -adj. shining with many colors when seen from different directions 17spectrum -n. a group of colors that appear when white light is separated by glass or a similar material 18aquarium - n. a glass tank that holds fish or similar animals that people keep for recreation 19reflect - v. to move light in a direction other than the one it is traveling in 20scale -n. small, hard structures that cover the body of most fish, reptiles, and some other animals 21transparent - adj. able to be seen through