Certain fish may contain high levels of mercury, which can contribute to developmental delays. Farm-raised fish may be contaminated with PCB’s (cancer-causing agents) and other toxins. You can safely consume up to 12 ounces a week of wild salmon (not farm-raised), sea bass, shrimp, sole, snapper, flounder, catfish, cod, haddock, sardines, tilapia, ocean perch, and pollack. Canned or shelf-stable salmon is safe. Avoid swordfish, shark, king mackerel, tilefish, refrigerated smoked seafood such as lox, trout, and whitefish (unless cooked as an ingredient in another dish).