What is carapus?

Carapus is a genus of eel-like fishes in the family Ophidiidae. They are commonly known as "pearlfish" because they live inside various invertebrates like sea cucumbers, starfish, and clams. The Carapus is long and slim, and they have no scales on their skin. Their head is flattened with two large eyes, and they have a long, slender tail. Pearlfish are known for their ability to mimic the movements or behavior of their host organism, and they may remain inside the host for extended periods. Some species of Carapus are commonly used as bait in fishing, while others are considered parasites and can cause harm to their hosts. Pearlfish are found in tropical and subtropical waters worldwide.