Yes, it's currently illegal to sell these in California. Check out what scientist created when they took some glow genes from the jellyfish types and mixed em with a little fish. "To achieve their goal of helping to fight water pollution, scientists are in the process of adding a "switch" that will cause the always fluorescing GloFish® zebra fish to selectively fluoresce in the presence of environmental toxins. A non-fluorescing fish will signal that the water is safe, while a fluorescing fish will signal trouble." In the mean time they look pretty cool in people's fish tanks.