The chain catshark (Scyliorhinus retifer) is a small shark, about 1.5 feet long native to the outer continental shelf from Massachusetts to Nicaragua. In 2005 it was discovered that the shark is fluorescent, under a blue light it glows bright yellow. Ironically this discovery was made somewhat close to the time the "The Life Aquatic with Steve Zissou" came out so it gets compared to the "Jaguar shark " a lot. Biologists are unsure if there is any reason that the shark is fluorescent it is most likely not really a thing that benefits the sharks but more of a mutation that didn't kill them. It is currently the only known fluorescent shark. They tend to hang out around burrowing cerianthid anemones in the wild and eat a lot of squid and crustaceans.