The Tsukiji market, just north of Tokyo Bay, is the largest fish market in the world. Each day, over 40,000 licensed buyers and sellers crowd the fifty-acre market to trade over 400 species of fish, shellfish, roe, and every other type of seafood. From the tiniest shrimp to the largest bluefin tuna, nearly every ocean species can be found at Tsukiji. But it is this last item, the bluefin, one of the largest and most prized fish at the market, that has created not just an international controversy, but a threat to the relations of some of the world's most powerful nations. For the tuna - particularly the large, migratory Atlantic bluefin - is, despite its large size, a microcosm of sorts for the general environmental and species degradation exacerbated by global trade, commerce, and industry. And the management (or lack thereof) of bluefin stocks represents much of what is wrong with current environmental treaty systems and international protection mechanisms.
The Atlantic bluefin presents a classic commons dilemma: one valuable resource, few real property rights. Moreover, the bluefin's highly migratory nature takes it through multiple jurisdictions and the high seas, allowing any fisherman with modern fishing equipment and a spotter plane to take what he can from the now diminishing stocks. Such easy access has proved devastating: Stocks in the eastern and western Atlantic have crashed to below twenty percent of pre-industrial biomass, yet nations still permit their fishermen to fish well above scientists' recommended catch limits. Worse yet, illegal, unregulated, and unreported (IUU) fishing has, by some assessments, doubled the annual catch that regulators have deemed acceptable. Though the international bodies that are supposed to regulate Atlantic bluefin fishing have lowered quotas in recent years, this has done little to stem the stock's decline. As of 2009, scientists wonder whether even a complete ban will allow the Atlantic bluefin to recover. Yet fishing persists.