Omega-3s and salmon - wher are we now?

摘要

Matthew Sprague presented his research into the levels of ome-ga-3s in salmon. As an oily fish, Atlantic salmon is renowned for its high levels of long chain omega-3 fatty acids, EPA and DHA. But salmon are inefficient at converting shorter chain fatty acids into EPA and DHA and must therefore acquire them through feed.Traditionally, the feed comprised of marine ingredients fishmeal and fish oil, but these are finite resources.Between 2000 and 2012 the global fed aquaculture industry increased from 15 to 35 million tonnes but the amount of fish oil produced from wild stocks in this period remained at 800,000 tonnes a year. So as aquaculture is increasing, fish oil is being spread thinner and thinner, and more and more of the diets have been substituted with alternative sustainable ingredients such as vegetables.