Pyrolycus is a genus of marine ray-finned fishes belonging to the subfamily Lycodinae, the eelpouts, within the family Zoarcidae.

[2] The type species is P. manusanus, which was discovered in the Manus Basin off Papua New Guinea.

[2] Species of Pyrolycus are found in deep waters of the Pacific Ocean, typically associated with hydrothermal vents or cold seeps.

They are thought to be predators, feeding on small invertebrates and possibly scavenging on the carcasses of larger animals.

[2][3] The presence of these fishes near hydrothermal vents and cold seeps indicates that they might depend on chemosynthetic bacteria.