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 5 recognized species in this genus: Gasterosteus aculeatus Linnaeus, 1758 (Three-spined stickleback) Gasterosteus islandicus Sauvage, 1874 (Iceland stickleback) Gasterosteus microcephalus Girard, 1854 (Smallhead stickleback) Gasterosteus nipponicus Higuchi, Sakai & A. Goto, 2014 Gasterosteus wheatlandi Putnam, 1867 (Black-spotted stickleback)
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