A fish’s shape and fin arrangement are highly variable among and within taxonomic groups. Some looks almost “un-fishlike” like seahorse, pufferfish, anglerfish, and gulpers. Little is known about most of their life histories, even population data is deficient. Fishes account for more than 50% of vertebrates. Out of the 30,000 known living species, about >90% are bony fish, and the rest are sharks, rays, and chimeras group, and hagfish and lampreys. More are still being discovered today; it is estimated that the world’s fish species list is likely around 32,500.