Pearlfish, a type of small marine fish that are usually found living inside the body cavities of bivalve mollusks such as oysters, clams, and mussels. These fish are also known by various other names, including Bluestripe Snapper, Brotula Multibarbata, and Vulcan Fish. Their unique ability to hide inside the shells of bivalve mollusks helps them survive the harsh marine environment and avoid predators. Some other synonyms for the word "pearlfish" include oceanic pearlview, pearl goby, freshwater pearl goby, marine pearls, and pearl spot. Each of these names has a similar reference to the pearly and pearl-like appearance of the fish.