Below are the approximate amounts of Omega-3 fats per 120g serving (120 g of fish/meat is about the size of a deck of cards and is just over four ounces).
Fresh Atlantic salmon 2,400 mg
Smoked salmon 2000 mg
Canned salmon 1,000 mg
Sardines 3,000 mg
Snapper 550 mg
Fresh rainbow trout 600 mg
Fresh tuna 1,200 mg
Canned tuna 290 mg
Grouper 300mg
Shark 500 mg
Orange roughey 140 mg
Crayfish 300 mg
Oysters (12) 1,000 mg
Shrimp 200 mg
Blue mussel 500 mg
Squid/Scallop/Calamari 400 mg
Halibut 2,000 mg