Hi Sheldon!
I love sardines - you can buy excellent canned ones here called 'shproti' in Russian. The fact that no one had answered your querie got me trawling the web.
At this address:
http://www.usaweekend.com/food/eatsmart/
I found the following:
Buy the fattiest fish. Try mackerel, anchovies, herring, sardines, salmon, tuna and turbot. Frozen and canned are OK, the USDA says. Eat enough. Daily, if you eat 2,000 calories, get at least 650 milligrams of omega-3, experts say.
A week's quota might be ONE of these:
6 ounces fresh mackerel*
10 ounces canned sardines
11 ounces pickled herring
12 ounces fresh salmon*
13 ounces canned salmon
14 ounces fresh tuna*
24 ounces canned albacore tuna
* weight before cooking
Cook correctly. Deep-frying destroys the benefits. Best cooking methods: bake, broil, poach, steam, stir-fry, saute or stew.
I hope this helps! I'm certainly going to up my sardine intake.
Best wishes,
Robert