Omega 3 Fish Oil Reducing Heart Disease

Yesterday "Doc" Doug Holland told our Aquaculture class that especially coldwater fish is good for your health, to eat it at least twice a week. I didn't understand why exactly, but he said it has positive effects on heart disease, "hardening of the arteries"...

I just checked the web for further info (a government source will suffice):

Dietary sources of omega-3 fatty acids include fish oil and certain plant/nut oils. Fish oil contains both docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), while some nuts (English walnuts) and vegetable oils (canola, soybean, flaxseed/linseed, olive) contain alpha-linolenic acid (ALA).

There is evidence from multiple studies supporting intake of recommended amounts of DHA and EPA in the form of dietary fish or fish oil supplements lowers triglycerides, reduces the risk of death, heart attack, dangerous abnormal heart rhythms, and strokes in people with known cardiovascular disease, slows the buildup of atherosclerotic plaques ("hardening of the arteries"), and lowers blood pressure slightly. However, high doses may have harmful effects, such as an increased risk of bleeding. Although similar benefits are proposed for alpha-linolenic acid, scientific evidence is less compelling, and beneficial effects may be less pronounced.

Some species of fish carry a higher risk of environmental contamination, such as with methylmercury.
Source: Omega-3 fatty acids, fish oil, alpha-linolenic acid

Recently, I bought a tub of Wal-Mart's Omega 3 Fish Oil, 1000 mg, based solely on the fact, my parents use to buy it at times. I thought it had to do with heart-related health.

There seems to be quite a lot of information on what Doc said, about the positive effects Omega fish oils have on reduced hardening of the arteries.