Is there a specific ratio of DHA:EPA that should be present in a supplement for overall health?

The dietitians of North America (ADA and DC) recently recommended an intake of 500 mg /day of (DHA+EPA) for healthy adults without specifying a ratio. It should be pointed out that the 1999 Fatty Acid Workshop at the NIH in Bethesda (USA) advised that at least 1/3rd of the DHA+EPA intake should be represented by each of the components. In other words an overall acceptable ratio of DHA:EPA could range from 2:1 to 1:2.