Patients with trimethylaminuria, or "fish odor syndrome," make too much of a chemical with a strong fishy smell.

At summer's end, more than a thousand locals gather in Alfa, Sweden, to eat fermented fish known as Surströmming. WSJ's John Stoll tries out the notoriously smelly fish.

Grab a lemon wedge and give your hands a good rub before washing them. The citric acid in lemon juice tackles those stubborn fish smells. Mix baking soda with water to create a handy solution. Soak ...