Originally Posted by Coraline

From looking at this article: Fish oil - Wikipedia, the free encyclopedia it would seem you can feed fatty fish and skip the oil supplement, but I'm not sure of the amount you would need. I give Wilson raw fish once or twice a month, and then supplement with the oil the weeks he doesn't get fish.

You can buy fish oil from Zooplus, like this one: Salmopet Salmon Oil: Great Deals on Dietary Supplements for Pets at zooplus

Hope that helps