CMC is Carboxymethyl cellulose (CMC) or cellulose gum. It is non-toxic and used in a variety of food and non-food products as a as a viscosity modifier or thickener, and to stabilize emulsions in various products including ice cream.
But can we trust the Chinese to make it correctly?
According to NOAA's FishWatch.gov site:
"Today, up to 90 percent of seafood consumed in the United States is imported, and about half of this is wild-caught. A significant portion (what does THAT mean?) of this imported seafood is caught by American fishermen, exported overseas for processing (WHY???), and then reimported (How do we know?) to the United States."
The United States mainly imports seafood from China, Thailand, Canada, Indonesia, Vietnam, and Ecuador.
Our top imports (by volume) include shrimp, freshwater fish, tuna, salmon, groundfish, crab, and squid. Check out U.S. foreign trade statistics.
Trade tracking programs monitor the international trade of some species such as bluefin tuna, swordfish, bigeye tuna, and Chilean sea bass by requiring that imports include documentation of details on catch—such as what gear was used and when and where the fish was caught.