The northern spearnose poacher (Agonopsis vulsa), also known as the window-tailed sea-poacher or the windowtail poacher,Common names for Agonopsis vulsa at www.fishbase.org. is a fish in the family Agonidae.Agonopsis vulsa at www.fishbase.org. It was described by David Starr Jordan and Charles Henry Gilbert in 1880, originally under the genus Agonus.Jordan, D. S. and C. H. Gilbert, 1880 (2 Nov.) [ref. 18354] Description of a new agonoid (Agonus vulsus), from the coast of California. Proceedings of the United States National Museum v. 3 (no. 162): 330-332. 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 . Males can reach a maximum total length of .
The northern spearnose poacher is sometimes used as a public aquarium fish.
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