I only know what I read on the web and they warn against China frozen products as well as Thailand fish because the safety standards are not as good as America. Farm fed fish can have toxic problems. I visited the salmon industry in Alaska on a tour and learned about how their fish is wild and the safest. The canneries are right at the shore by the boats and the workers have dorms to live there and can the products in a few weeks. Frozen products are pretty safe these days. The low calories and omega 3 oils are what make fish healthier than beef or pork. I like that it is easy to eat, tender easy to chew. The fat is better for you than land animal fat. Raw oysters can be a problem if they are not very fresh and carefully handled. I seldom eat them raw anymore and cook them in a stew. But they have the highest amount of zinc in them which is an important nutrient. They are a low calorie food. Dorisena