The fact that global fish supplies are dwindling dramatically is deeply concerning on a number of levels.

In 2003, it was found that the number of large fish, including tuna, marlin, swordfish, sharks, cod and halibut, in the world’s oceans had dropped by 90 percent in just 50 years. This means that only 10 percent of all large fish are left in the ocean.

One of the saddest commentaries I’ve heard on this issue is from Sergi Tudela, a Spanish marine biologist with the World Wildlife Fund, who speaks of the disappearance of giant bluefin tuna (which are prized for making sushi). He says:

"My big fear is that it may be too late. I have a very graphic image in my mind. It is of the migration of so many buffalo in the American West in the early 19th century. It was the same with bluefin tuna in the Mediterranean, a migration of a massive number of animals.

And now we are witnessing the same phenomenon happening to giant bluefin tuna that we saw happen with America's buffalo. We are witnessing this, right now, right before our eyes."