As you gaze down at the piece of salmon sitting atop the sushi roll you just ordered, you may wonder: Where did this fish come from? Who caught it? How are there enough fish being caught to feed all of the other people who ordered a salmon sushi roll today? Will there be enough tomorrow as well? Despite pondering these questions for a few seconds, you probably shrug it off and delve into your delicious meal, not to think of it again until the next time you arrive at a sushi restaurant.