Tilapia are freshwater fish, native to North Africa and introduced throughout much of Asia, Central and South America and the United States. The Monterey Bay Aquarium Seafood Watch says, “Tilapia is a good candidate for farming, as it provides more protein than it takes to raise it. This is in contrast to some other fish raised in farms, such as salmon or tuna.” Still, farming practices vary wildly. In worst case scenarios, fish cages so crowd production lakes that you can literally walk across them. According to FishChoice.com, a business-to-business online seafood sourcing tool that lists seafood products that meet the sustainability criteria, in China, tilapia is almost always grown in earthen ponds a few feet deep. China is a major supplier of tilapia to North America; this would explain the unfortunate muddy taste of some of the tilapia we’ve encountered in supermarkets.