The MCZ's in theory are a good idea, but from what I have heard/seen proposed some are very poorly thought out and researched.
Common fisheries policy needs a proper shake up, and not only that it needs enforcing, so that the Scandinavians, French, and the spaniards start complying with the regulations that the British fishing fleet have screwed down over them.
Take the quotas back from people using them as trading assets. How many people know that premier league football clubs such as Manchester United own a good chunk of this countries quotas and are screwing hard working fishermen