rockfish

UK: /ˈrɒkˌfɪʃ/ US: (rok′fish′)

Inflections of 'rockfish' (n):

rockfish

npl (Especially as a collective plural—e.g. "Rockfish often live around rocks.")

rockfishes

npl (Mainly used to talk about different types—e.g. "Rockfishes include the stonefish and the striped bass.")

WordReference Random House Unabridged Dictionary of American English © 2025

rock•fish  (rok′fish′), n., pl. (esp. collectively) -fish,  (esp. referring to two or more kinds or species) -fish•es. 

1. Fish any of various fishes found about rocks.
2. Fish See striped bass. 
3. Fish any of the North Pacific and Atlantic marine fishes of the genus Sebastes.
4. Fish scorpionfish. Also called rock cod (for defs. 1–3).

• rock¹ + fish 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

rockfish / ˈrɒkˌfɪʃ/ noun ( -fish, -fishes)

1. any of various fishes that live among rocks, esp scorpaenid fishes of the genus Sebastodes and related genera, such as S. caurinus (copper rockfish) of North American Pacific coastal waters
2. any of several coarse fishes when used as food, esp the dogfish or wolffish