Its teeth are designed not so much to grab or slice fish but to prevent them from escaping once the coelacanth has sucked them into its gaping maw. Beneath the chin lie large, bony plates.

A tiny, scaleless, freshwater fish, the highly endangered unarmored threespine stickleback is a fierce protector of its nest, which it defends by dashing forward with gaping mouth and “hackles” raised ...

Watch fish curator James Maclaine get up close and personal with one of these unusual pairings. Males in the suborder Ceratioidei only grow to a fraction of the size of females. Females have the ...

Every year, these prehistoric fish journey some 2,000 miles from the East China Sea to their spawning grounds in the Yangtze River. Or, at least they used to. In recent years, this ancient ...