Mary M., of the fantastic blog Cooking with the Junior League, mentioned in one of her blog posts that the Monterey Bay Aquarium has a handy seafood guide that provides information on how various types are raised/caught, whether it is overfished, and the environmental impact. This page lets you click on different species and get detailed information about it; here’s a screenshot of part of the listing for abalone:

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Or you can go to their U.S. map and click on a region to download a pdf guide to buying seafood in your region.

Also see our post on the Consumer Reports eco-labeling website and the interactive map of factory farms.