Because the common people have demonstrated insufficient fear of science, Japanese researchers have produced goldfish whose beating hearts can be seen through translucent scales and skin:
“You can see a live heart and other organs because the scales and skin have no pigments,” said Yutaka Tamaru, an associate professor in the department of life science at Mie University.“You don’t have to cut it open. You can see a tiny brain above the goldfish’s black eyes.”
The joint team of researchers at Mie University and Nagoya University in central Japan produced the “ryukin” goldfish by picking mutant hatchery goldfish with pale skin and breeding them together.
“Having a pale colour is a disadvantage for goldfish in an aquarium but it’s good to see how organs sit in a body three-dimensionally,” Tamaru told AFP.
The fish are expected to live up to roughly 20 years and could grow as long as 25 centimetres (10 inches) and weigh more than two kilograms (five pounds), much bigger than other fish used in experiments, such as zebrafish and Japanese medaka, Tamaru said.
“As this goldfish grows bigger, you can watch its whole life,” he said.
The claim is that they reduce the need for dissections.