Salmon producers in Chile, under pressure from international buyers to reduce the amount of antibiotics they put into their fish, intensified their use of the substances in 2015 from the previous year, government statistics showed on Friday.

The government, under legal pressure from environmental groups, also published the amount of antibiotic use per company for the first time ever in its annual report, revealing significant differences between producers operating in the world's No. 2 salmon exporter.

The new statistics could heap pressure on Chile's salmon industry, which faces calls to clean up its environmental act and has suffered huge losses in 2016 due to algal blooms.

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