The pike topminnow (Belonesox belizanus), more commonly known as pike killifish and sometimes referred to as topminnow,[2][3] is a species of poeciliid found from Mexico to Nicaragua.

[5] The pike topminnow was described in 1860 by Austrian ichthyologist Rudolf Kner,[6] who gave the type locality as Belize, which is reflected in this species' specific name.

[7] Unlike most poeciliids (which tend to be generalists or micropredators), this is a highly specialized predator, with an extremely flexible upper jaw that enables it to take very large prey items for its size.

[2] It has an elongated appearance with a flat back profile.

The pike topminnow has large eyes and a dorsal fin set far back on the body.