A disturbing undercover video from a salmon hatchery in Maine is drawing new scrutiny to the costs of industrial seafood production as the U.S. moves to expand aquaculture. What happened? Animal Outlook, an advocacy group, released footage it says was recorded between September and December at Cooke Aquaculture's salmon hatchery in Bingham, Maine. According to the group, cited by the Guardian, the video appears to show workers striking fish with…