Fishery is an unmitigated environmental catastrophe.
Yes, it is.

As it stands, any proposed lowering of fish quota to sustainable levels is met everywhere within the EU with furious allegations of intrusive 'Brussels bureaucracy', out to destroy fishing communities.
Until last year the fishing quota for tuna in the mediteranean was actually very close to what's considered sustaintable. The problem is that most countries have fishing fleets capable of easily exceeding this amount on their own. The fishing quota is a farce; Italian fishermen justify their behaviour by pointing out that the French and Spanish are doing the same. And none of those countries are interested in enforcing the rules.

One of the arguments against Icelandic entry, from their own perspective, is that their own fishing regulations are at least as good and are enforced properly.