Zoarcoidei is a suborder of marine ray-finned fishes belonging to the order Perciformes. The suborder includes the wolffishes, gunnels and eelpouts. The suborder includes about 400 species. These fishes are predominantly found in the boreal seas of the Northern Hemisphere but they have colonised the Southern Hemisphere. Many members of this suborder are extremophiles adapted to deepwater ecosystems (including hydrothermal vents) and polar waters.

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