” Slow moving, soft bodied bottom dwellers for the most part, Sea Cucumbers are an ancient lineage of sea creatures who have evolved a variety of ways to survive and thrive over hundreds of millions of years of evolution. For some Sea Cucumbers, being transparent allows them to fly under the radar, as it were, of predators in search of a quick & easy kill.
Like glass squids and other deep sea marine animals, certain species of transparent jellyfish use bioluminescence to attract prey close enough for the jellyfish’s tentacles to shock them into submission.
In late 2009, researchers at Mie University in Japan created a transparent goldfish by selectively breeding pale gold fish. The end result was a fish with translucent scales and skin through which many of the creature’s internal organs can be easily seen. “As this goldfish grows bigger, you can watch its whole life,” said Yutaka Tamaru, an associate professor at Mie University. That life could go on for some time as the non-gold goldfish are expected to live up to 20 years and grow to a length of 10 inches (25cm).”