Gasterosteus is a genus of ray-finned fishes belonging to the family Gasterosteidae, the sticklebacks.

These fishes are found in freshwater, brackish water and marine habitats in the Holarctic region.

There are currently 6 recognized species in this genus: Additionally there are a number of fossil species including: Fossils of essentially modern three-spined sticklebacks, assigned to G. aculeatus, are known from the mid-late Miocene of California, USA.

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