Potassium is a mineral that plays a role in maintaining normal blood pressure, and muscle and nerve function. Many varieties of fish contain potassium, including cod, coldwater prawns, coley, cuttlefish, dab, Dover sole, flounder, haddock, halibut, herring, ling, mackerel, monkfish, mussels, pouting, red mullet, salmon, sardines, sea bass, sea trout, red snapper, sprat, tilapia, trout, tuna and whiting. Clams are particularly rich in this nutrient.

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