As of today, the European Commission has banned the fishing of Bluefin Tuna (Thunnus thynnus) in the Mediterranean and Eastern Atlantic. Good for them, though it is a bit late. Stocks of this impressive and long-lived creature have already been decimated globally.
[Update: 21 September 2007] Jennifer Jacquet has more about this, over on Shifting Baselines.
[Update: 2 December 2007] Shifting Baselines has even more on this.