The northern spearnose poacher (Agonopsis vulsa), also known as the window-tailed sea-poacher or the windowtail poacher,[1] is a fish in the family Agonidae.[2] It was described by David Starr Jordan and Charles Henry Gilbert in 1880, originally under the genus Agonus.[3] It is a marine, temperate water-dwelling fish which is known from the eastern Pacific Ocean, including southeastern Alaska to southern California, USA. It dwells at a depth range of 0mto163mm (00feetto535feetm). Males can reach a maximum total length of 20cm (10inches).[2]
The northern spearnose poacher is sometimes used as a public aquarium fish.[2]