Here are the arguments that the Moroccan government circulated in the European Parilament the days before the vote on the EU-Morocco fisheries agreement, 14 Dec 2011.
The EU considers to pay Morocco to fish in occupied Western Sahara. An EU-Morocco Fisheries Agreement from 2013 would be both politically controversial and in violation of international law.
The international Fish Elsewhere! campaign demands the EU to avoid such unethical operations, and go fishing somewhere else. No fishing in Western Sahara should take place until the conflict is solved.