if you eat a lot of fish normally, particularly salmon, you probably don't need fish oil caps, as long as your total fat intake is in the 20-30% range like Abear mentions.
I know myself, personally, when I start eating clean, my fat intake plummets to 15% of daily calories, so I take some EFA pills, a little peanut butter, or add almond slices as a snack.
Since there's 9cals in a gram of fat, vs 4cals in a gram of carbs or protein, a little fat goes a long way, so increasing fat intake to 25% is really quite easy.