omega-3 fatty acids from fish OR from fish oil supplements. ??

It's better to get omega-3 fatty acids from fish than from fish oil supplements.

Stick with fish, not capsules. Most of the encouraging studies have looked at people eating fish, not taking a supplement. 

Extracted omega-3 fatty acids may not have the full benefits of what's naturally in fish.

Some recent studies of people at higher risk of heart disease did not find that omega-3 supplements helped. 

People with heart disease should talk to their doctor to see if omega-3 supplements might be a good idea.

Info source:

http://www.m.webmd.com/food-recipes/rm-quiz-fish-fact-fiction?ecd=wnl_rhu_071213&ctr=wnl-rhu-071213_ld-stry&mb=GULHw1r0yczQttMGkoWNR%40HnVev1imbCX2R%2fDNcXcrE%3d