Levels of beneficial omega-3 oils in farmed salmon have fallen significantly in the past five years, a study shows.
BBC News has learned that, on average, levels of omega-3s halved in the fish over that period. Despite this, the analysis shows that farmed salmon is still one of the richest sources of these fatty acids.
But the industry is exploring new ways to arrest the decline - which appears to be due to the type of feed given to the farmed fish.
The study was carried out by researchers at Stirling University. Prof Douglas Tocher, who led the research, told BBC News: "About five years ago, a portion of Atlantic salmon of 130g was able to deliver three-and-a-half grams of beneficial omega-3. This is actually our weekly recommended intake. Now, the level of omega-3 has halved," he said. "Therefore, instead of eating one portion of farmed salmon, we would need to eat two portions of farmed salmon," he explained.
Source - BBC