Want to raise fish high in omega-3 fatty acids

[bsfman]

Here are links to abstracts for a couple of studies which found that though omega-3 had a beneficial effect on cardiac health, omega-6 had no problematic effect on cardiac health (hence the ratio is also irrelevant to cardiac health). The important thing is evidently to get enough omega-3.
http://www.ncbi.nlm.nih.gov/pubmed/17876199
http://circ.ahajournals.org/content/111/2/157.full