Bathymaster signatus, the searcher, is species of marine ray-finned fish belonging to the family Bathymasteridae, the ronquils.

Bathymaster signatus was first formally described in 1873 by the American paleontologist and biologist Edward Drinker Cope with its type locality given as Sitka, Alaska.

[2] The specific name signatus means "marked", presumed to be an allusion to the black spot crossing the tips of the membranes and first five rays of the dorsal fin.

[3] Bathymaster signatus has an elongated, moderately compressed body, deepest at the start of the dorsal fin, with a large slightly pointed head.

The eggs have a diameter of 1.4 mm, and a weight of 1.14 mg. Their diet is made up largely of polychaetes as well as hermit crabs, shrimps, and gammarids, in order of decreasing importance.