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Some of the main ingredients that farmers feed their fish are, ironically, wild-caught fish. And a new study suggests that the aquaculture industry uses far more wild fish than previously estimated.

At the same time, the fish-feed industry, franticly searching for alternative protein sources to fishmeal and fish oil from wild fish, has become keenly interested in Antarctic krill.

Hayek and his colleagues have shown that the amount of wild fish killed in order to feed farmed fish is between 27 and 307 per cent higher than previous estimates.