Fish
Prickly Sculpin
Cottus asper · also called prickly sculpins
Resting motionless on the bottom of a Pacific coast estuary, a prickly sculpin blends into the substrate, its rough, prickled skin giving away exactly which sculpin species is hiding there once someone actually gets close enough to feel it.
Overview
The prickly sculpin, Cottus asper, is a bottom-dwelling fish native to streams, lakes, and estuaries across a broad range of the Pacific coast of North America. Its distinctive rough, prickled skin, tolerance for both freshwater and brackish conditions, and considerable size among sculpin species make it one of the more physically distinctive and habitat-flexible sculpins found along the Pacific coast.
A texture that gives it away
While many sculpins rely purely on camouflage to stay hidden, the prickly sculpin’s rough, textured skin offers a second, tactile way to identify the species once it has already been spotted or handled.
Status
Least Concern — widespread and common across suitable stream, lake, and estuary habitat throughout the Pacific coast of North America.
Prickly Sculpin: common questions
Why is it called the prickly sculpin?
This species has small, rough prickles covering much of its skin, an unusual texture among freshwater fish that is clearly noticeable to the touch and gives the species its descriptive common name, distinguishing it from several smoother-skinned sculpin relatives sharing similar habitat.
Can the prickly sculpin live in both freshwater and saltwater?
This species tolerates a range of salinity levels, occurring in freshwater streams and lakes as well as brackish estuaries along the Pacific coast, a flexibility that allows it to occupy a broader variety of habitat than sculpin species restricted to freshwater alone.
Why doesn't the prickly sculpin float like most fish?
Like other sculpins, this species lacks a functional swim bladder, the organ many fish use to control buoyancy, so rather than floating freely in open water, it rests directly on the bottom of streams, lakes, and estuaries and moves in short, darting bursts along the substrate.
How big does a prickly sculpin get?
This species is one of the larger sculpin species found in North America, reaching a greater size than several smaller freshwater sculpin relatives, though it retains the same large, flattened head and tapering body typical of sculpins generally.