Fish.
Favourite is smoked haddock or a Conish Cock Crab - I can never decide between the two.
I love all fish and pretty much all shellfish. The only thing out of the sea I've never been able to 'get on board' with are oysters. I've tried them so many times, and I desperately want to like them.....but I just don't.
Meat-wise, I'm not a big beef or lamb eater, although I do absolutely adore calves liver.
Main meat we eat as a family is chicken, although would happily eat fish every single day were it not for (a) the hellish cost of fish in the UK and (b) the iffy quality of fish in supermarkets (we are lucky that we do have a proper fishmonger near us, and the quality is outstanding (really fat smoked haddock fillets) but the prices are eyewatering).