The most convincing argument against consumption of big fish is that the toxicity level has been discovered to increase corresponding to the size of the fish. Experts advise consumers to purchase small fry. That means small species, not baby tuna, sea bass or swordfish. Sardines, anchovies and herring are lower on the food chain and rich in heart-healthy omega-3 oils yet lowest in mercury and other pollutants that collect in the fats of big old predators.

Vanzi, S. (2013, October 3). Small fish is in; big fish is out. Manila Bulletin, p. C-3.