Seafood can be an important part of a healthy diet, but due to overfishing, the build-up of contaminants such as mercury in our oceans (and consequently in seafood itself), and detrimental effects of some kinds of aquaculture on the environment, you need to take some care in choosing your seafood. Best Choices have abundant fishstocks, are well-managed, and are caught or farmed in environmentally friendly ways. There are concerns with the capture and farming methods of Good Alternatives, as well as concerns about the health of the fish's habitat.