The rockweed gunnel (Apodichthys fucorum), also known as the Fucus blenny, is a species of marine ray-finned fish belonging to the family Pholidae, the gunnels. This species is found in the eastern North Pacific Ocean. They may often get mistaken with the Rock Gunnel, otherwise known as the Butterfish. The mix-up is further exacerbated with the German name of the Rockweed Gunnel which is Butterfisch.

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