I spent a bit of time just now doing some searches for you to come up with a possibly identification.
First I ran the search in the Cottidae (sculpin) family and narrowed it down to 61 species in the Pacific Northwest.
Then out of the 61 fish photos, the ones with the genus
Enophrys stood out.
I then narrowed down to two
Enophrys species:
Leister sculpin (
Enophrys lucasi) and antlered sculpin (
Enophrys diceraus). I can't find any photos of leister sculpins, only drawings, with no complete description of its morphology. Although the drawing somewhat resembles your catch, I am leaning towards the antlered sculpin more.
Here's what the antlered sculpin looks like in water.


Description of the morphology:
Dorsal spines (total): 7 - 8; Dorsal soft rays (total): 12 - 15; Anal spines: 0; Anal soft rays: 10 – 13. Dorsal surface of head rough with 2 pairs of developed bony ridges; uppermost preopercular spine long and straight with some ascending processes dorsally in adults (Ref. 559). Lateral line scales large and with a rough posterior margin.
Don't be fooled by the difference in colours. Your fish could have changed colour as soon as it left the water like some groundfish do. I counted the pectoral fin rays of your fish, which is within the range of the description (16 to 19, yours had around 16 or 17). The tips of your fish's pectoral fin are orange/pink in colour, fairly close to the body colouration of the antlered sculpin when it is in the water. What really stands out is the "two pairs of developed bony ridges on the head surface", which you can clearly see on your fish. The size of the fish also falls within the range, around a foot long. Other than that, I can't really use any other features on your fish to identify because I can't see them.
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