The Brown shark, also known as the Sandbar shark is commonly found in public aquariums. The genus name Carcharhinus is derived from Greek words meaning "sharpen nose". It is a coastal-pelagic shark that lives in temperate and tropical waters throughout the world. It is naturally a bottom-dwelling shark found in shallow coastal waters, and is known to be highly migratory. The Brown shark is an important species in commercial fisheries along the Eastern United States, and is the primary targeted species in this area. Because of its age at reproduction and the fact that it reproduces every other year producing a small number of young, the Brown shark is vulnerable to over-exploitation. Although rarely associated with attacks on humans, the size of the Brown shark makes it a potential threat.
In most of the swallowtail angelfish species, the male has a more complicated pattern than the female. This species, found from the Philippines to remote islands of the South Pacific, is an exception. The male has a pattern of gold strips bordering a broad pinkish band. The female has a striking pattern of black, white, and purplish-blue. The Latin word "bellus" means "beautiful". The Greek word "genicanthus" means "cheek spine".
In contrast to many other angelfish, which live in pairs, swallowtail angels, in the genus Genicanthus live like fairy basslets, with a dominant male guarding a harem of females. As with fairy basslets, if the male dies, the dominant female will become male and take charge of the harem. This species is found only in the Red Sea and the Western Indian Ocean. Only the male has the zebra pattern but only the female has the black stripes at the top and bottom of the tail, commemorated by the Latin name "caudovitatu", which means "striped tail".