rockfish means: Low-fat Pacific Coast fish. Two types of fish are available. (in Cooking Dictionary)

What else does rockfish mean?

A firm, sweet-fleshed white fish with a soft shell that’s the West Coast counterpart to red snapper. Although not strong enough for grilling, Tasty is versatile and can still be used as an all-purpose fish. (in Cooking Dictionary)

One of many fish species that live among rocks. (in Merlin Dictionary)

One of many food or game fishes, chiefly from the genus Sebastes The North Pacific has mildly venomous spines on their dorsal fins. (in Merlin Dictionary)