So asks this WSJ article ... http://online.wsj.com/article/SB10001...
Consider the monkfish.
While guides from Seafood Watch and the Blue Ocean Institute both say monkfish populations are sufficient to continue harvesting at current rates, each group takes issue with the method used to catch the warty, brown bottom-feeder. The meaty fish is caught in giant nets that are dragged along the ocean floor, a method environmental groups warn destroys habitats and other sea creatures. For this Seafood Watch gives monkfish its lowest, "red" rating. However, because of different methodology, the fish gets a middle-of-the-road "yellow" from the Blue Ocean Institute.
The U.S. government doesn't agree with either nonprofit group. The habitat impact of catching monkfish is "acceptable," says Laurel Bryant, director of external affairs at National Oceanic and Atmospheric Administration's Fisheries Service, which counts and regulates how much fish is caught in the U.S. and maintains its own extensive seafood-buying guide called FishWatch.