Tuna itself may be good for the heart, but the levels of mercury often found in tuna can wreak havoc on your body over time. To ensure its tuna is free from harmful levels of mercury, a fishing company has mercury standards ten times stricter than the FDA recommends, which it enforces using an innovative fish-by-fish testing system. The company claims it has the lowest mercury concentration of any canned tuna company, and now wants to use its wealth of data to tackle the source of the contamination.