FishesPisces

A fish is an aquatic creature that falls under the class Actinopterygii, which includes a diverse range of species such as hagfish, lampreys, cartilaginous and bony fish, as well as various extinct related groups. One defining feature of fish is their possession of gills, which allow them to respire in water, and their lack of limbs with digits. It is worth noting that ray-finned fish make up around 95% of the current fish species, with teleosts alone accounting for approximately 99% of this classification.