[7] The Adults of this subtype, while smaller are fully mature save for the enlarged head pores that juveniles of the main form exhibit.

[4] Living mostly in rivers and streams, Coastrange sculpins are found in riffles and glides with coarse or cobble stone bottoms from .20m to 1.0m in depth.

[8] Coastrange sculpins are solitary, nocturnal carnivores and known to eat nymphs and larvae of insects such as mayflies, stoneflies, and chironomids (and other aquatic invertebrates).

[7] Their larvae are free swimming/floating and feed mostly on plankton, however they become bottom dwellers after they transform and eat the same diet as the adults, except that they take smaller organisms as prey.

[3] Coastrange sculpins normally spawn in spring, when the water warms past 6 degrees C, though eggs have been found as early as January in British Columbia.

[7] During courtship, a female approaches the nesting site and the male begins a series of head nods, shakes and flares of the gill covers.

[9] Larvae are active immediately after hatching and begin a nocturnal migration further downstream, where they usually grow for about a year in estuaries before returning to freshwater.