You must read the label of the fish oil that you take. Standard fish oil capsule has only 180 mg EPA and 120 mg of DHA. When you are asked to take 3000 mg of fish oil, it means net EPA and DHA combined. This mean that you need 10 capsules of standard fish oil capsules to get 3000 mg (EPA and DHA net). Most fishes have between 200-1000 mg of EPA and DHA. The max fish oils to take is 4-6 grams. Take extra 1gram per day in both fish or fish oil is ok.