I believe that Londoners prefer cod with their chips. More civilized Northerners prefer the infinitely more delicate and flavoursome haddock. The Scots are given to frying Mars Bars or so it is said.
i don't know, maybe because they feel like jelly and they live in the sea so they add fish into it because they cant really call it ''jelly''. Many scientist prefer to call jellyfish sea jellies, but...