"Therefore, instead of eating one portion of farmed salmon, we would need to eat two portions of farmed salmon," he explained.
Image copyright GUSTOIMAGES/SCIENCE PHOTO LIBRARY Image caption Salmon get their omega-3 from smaller oily fish that have been ground up and mixed into their feed The decline is a result of the industry having to cut back on the amount of anchovies it uses in feed because, previously, it was recognised that far too many anchovies were being caught for fish food. There has also been a growing demand for farmed salmon across the world. According to Dr Paul Morris, of Marine Harvest, one of the world's largest producers of farmed salmon, a much reduced supply of fish oil for feed has had to be spread ever thinner. "We have a fixed amount of fish oil, and we are making sure that we are using that as efficiently as possible. That won't get us further than a certain amount of the way, so ultimately we will have to look at other sources of (beneficial) omega-3," he said.
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