Certain fish (typically ocean caught) seem to have the highest level of Omega 3 so for that reason fish oil is sold as a supplement. But there are also vegetarian Omega 3 supplements.
Pecans for example;
http://www.nutritiondata.com/facts/nut-and-seed-products/3129/2 As you can see from the link (if you scroll down a little) a cup of chopped pecans contains a total of 22487mg Omega-6 fatty acids *and* 1075mg Omega-3 fatty acids, so.. roughly 21 times as much Omega 6 than 3.
So if you're eating lots of pecans you might want to balance that with say.. hickory nuts which are more like 1:20 Omega 6 to 3.
