Skipjack tuna in brine has very little of the beneficial omega-3 fats EPA and DHA; you would need to eat 300 to 700 grams of it to get the same amount found in just 10 grams of mackerel.

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.