What is "rock salmon"

n. (context British English) A marketing name for the flesh of any of several species of small sharks.

n. any of several coarse fishes (such as dogfish or wolffish) when used as food

Rock salmon, also called rock eel, flake, huss or Sweet William, is a dish popular in Britain, based on shark, often served as part of a fish and chips supper.

The dish can be one of many species of small shark, including the spiny dogfish (Squalus acanthias), Rough-hound (Scyliorhinus canicula) or the bull huss (Scyliorhinus stellaris).

Rock salmon is consumed in many European countries. However, the spiny dogfish is now an endangered species due to overfishing, and is classed as Vulnerable on the IUCN Red List and the North East Atlantic population is Critically Endangered.