Earlier quoted context omitted.
Somalian pirates are the result of international fishing fleets depleting the fish in the area giving the local fishermen few other options. (It’s more complicated than that, but so is everything)
Sorry, but that explains nothing for me. OP said: Europeans now sail to Somalia to fish. Why would Europeans go so South into the Gulf of Arden? Why would Norwegian fishers go South? What's going on? Where's the data? What are the incentives? Does Somalia have fishing quotas? Is there any anti-overfishing agreement system for that region?
http://content.time.com/time/world/article/0,8599,1892376,00...
> Ever since a civil war brought down Somalia's last functional government in 1991, the country's 3,330 km (2,000 miles) of coastline — the longest in continental Africa — has been pillaged by foreign vessels. A United Nations report in 2006 said that, in the absence of the country's at one time serviceable coastguard, Somali waters have become the site of an international "free for all," with fishing fleets from around the world illegally plundering Somali stocks and freezing out the country's own rudimentarily-equipped fishermen.
> High-seas trawlers from countries as far flung as South Korea, Japan and Spain have operated down the Somali coast, often illegally and without licenses, for the better part of two decades, the U.N. says.
They do it because there were a lot of fish there and no functional government to stop them or enforce quotas.