Only one salmon producer in Australia – Tassal – has increased its use of antibiotics, new figures show, as calls grow for farmers to limit their use of the drugs to stop the rise of superbugs.

Tassal, Australia's biggest salmon company, quadrupled its use of antibiotics between 2012-13 and 2015-16, despite promising to phase them out and its rivals dramatically reducing their reliance on the medicines over the same period.

According to its latest sustainability report, it fed 301 kilograms of antibiotics in total, up by 443 per cent, or 9.8 grams per tonne of fish, up by 353 per cent, on the figures three years prior.

"Over the past 15 years, antibiotic use has fallen dramatically in salmon farming worldwide and in Tasmania," a Tassal spokesman said. "Antibiotic use now may fluctuate from year to year depending if fish require treatment."