The Codfather, could be linked to queue-jumpers receiving an offer they can't refuse.

Fish around here (Whitby) is assumed to mean cod, though one or two shops offer more exotic alternatives as cod stocks dwindle. Most also have haddock and/or plaice but not always available. I haven't seen skate offered for years, though a coal-fired shop in Beverley used to have it.

When I lived in Cleethorpes fish was assumed to mean haddock, locals scorned cod as something only fit for visitors from Yorkshire (locally reckoned to be about the lowest form of life outside Londoners)

What all these coastal places had in common was a belief that freshness was a serious matter, and that a portion of fish should at least half cover a dinner plate. Inland places seldom seem to have grasped these fundamentals.