Overfishing affects 34% of fish stocks (FAO). Monterey Bay Aquarium Seafood Watch provides ratings. "Best choices" include: farmed oysters/mussels, wild-caught Alaskan salmon, sardines, Atlantic mackerel. Avoid: Atlantic bluefin tuna, sharks, orange roughy.

Small fish like sardines and anchovies are sustainable and nutritious. Lower in mercury too.

I use the Seafood Watch app when buying fish. Easy to make sustainable choices.