According to the article, Americans ate 475 million pounds of tilapia last year, more than 4 times the amount eaten a decade ago. They're sometimes called "aquatic chicken" because they are so plentiful, easily farmed and have a bland taste. ("Chicken of the Sea"?)
Tilapia are originally lake fish from Africa. But during the second half of the 20th century, they were transported to poor tropical countries to control the weeds and the mosquito population. Now they are mostly farmed in Latin America and China. But there are some problems that go along with these easily farmed fish.
Another problem with these farmed fish is that they are less healthy than other fish. Their amounts of the good Omega-3 (and other) fatty acids are much lower than other fish. (Salmon has 10 times more.) The reason? Fish get these healthy compounds from what they eat in the wild, not from feed made with corn and soy. Still, they have some of the fatty acids and that's a good thing.