Fish is an excellent source of high-quality protein, omega-3 fatty acids, vitamins, and minerals, but not all seafood offers the same nutritional and environmental benefits. Some species may contain higher levels of mercury, while others raise concerns related to sustainability, farming practices, or environmental impact. Making informed seafood choices can help support both personal health and responsible consumption.

Large, long-lived predatory fish tend to accumulate more mercury over time. Species such as bluefin tuna, swordfish, orange roughy, and Chilean sea bass are often cited as examples that should be eaten less frequently, especially by pregnant women and young children. In addition, some imported farmed shrimp, salmon, tilapia, and catfish may come from operations with varying environmental or labor standards, making the source of the seafood an important consideration.

Many nutritious alternatives are widely available. Wild Alaskan salmon, Pacific cod, U.S.-caught wild shrimp, sardines, anchovies, mussels, and responsibly farmed trout are generally lower in mercury and are often recommended as more sustainable options. These choices provide valuable nutrients while helping reduce pressure on overfished species when sourced responsibly.

When purchasing seafood, it is helpful to look for recognized sustainability certifications and consult reliable seafood guides. Paying attention to where and how fish is caught or farmed allows consumers to make more informed decisions. While a single meal has little impact on its own, consistently selecting responsibly sourced seafood can support healthier diets and contribute to the long-term protection of marine ecosystems.