Shopping for fish and seafood can be particularly tricky.
There is a guide out there. It's called the Monterey Bay Aquarium Seafood Watch program. It has been in existence for 19 years and is a leader in the sustainable seafood movement that began in the 1990s. As part of its efforts to help consumers and businesses make choices for a healthy ocean, it offers a free mobile app and guides with recommendations for which seafood to buy and avoid. (Find the guides at seafoodwatch.org.)