Pike

Sander is a genus of predatory ray-finned fish in the family Percidae, which also includes the perches, ruffes, and darters. They are also known as "pike-perch" because of their resemblance to fish in the unrelated Esocidae (pike) family. They are the only genus in the monotypic tribe Luciopercini, which is one of two tribes in the subfamily Luciopercinae. Sander species have elongated and laterally compressed bodies and they range in total length from 45 cm (18 in) in the Volga pikeperch (S. volgensis) to 130 cm (51 in) in the zander (S. lucioperca). The species within the genus share canine-like teeth that are at their largest in the zander, and although they are not present in adult Volga pikeperches, they do possess them as juveniles. in addition, they have thin rows of teeth on their jaws, vomer, and palatines, the preopercle shows strong serrations along its edges, a continuous lateral line reaches all the way from the head to the caudal fin, and this is flanked by additional lateral lines, one each on the upper and lower lobes of the deeply forked caudal fin. Further features in common include the absence of genital papillae, seven or eight branchiostegal rays, 12–13 soft rays in the anal fin, and the eye has a reflective layer behind the retina, known as a tapetum lucidum, which is an adaptation for seeing in low-light conditions. The species in the genus Sander are largely piscivorous as adults.

Source: Wikipedia