Order
Common name: Pearlfish
Scientific name: Ophidiiformes
Ophidiiformes is an order of ray-finned fish that includes pearlfish, cusk-eels, and brotulas. These elongated, often eel-like fish are found in marine environments worldwide, from shallow reefs to deep-sea habitats. Many species within this order exhibit interesting behaviors and adaptations, such as the pearlfish's symbiotic relationship with sea cucumbers, where they seek refuge inside the cucumber's body. While not commonly kept in home aquariums due to their specialized needs and behaviors, some smaller species may be suitable for advanced hobbyists with species-specific setups.