A Tasmanian salmon farm lease used nearly three tonnes of the antibiotic florfenicol over a two-month period [1].
The scale of the medication use raises critical questions about the environmental health of local waterways and the risk of developing antimicrobial resistance. Such high volumes of antibiotics in aquatic environments can alter local ecosystems and impact wild fish populations.
Data released on April 29, 2026, detailed the usage at the specific lease [1]. The Australian Greens said the amount of florfenicol used was concerning. The party highlighted the potential for these chemicals to leach into the surrounding water, creating long-term ecological risks.
While the data for one site has been made public, information regarding other locations remains unavailable. Usage data for eight other sites have not been released [1]. This lack of transparency complicates the ability of regulators and environmental experts to assess the total antibiotic load being introduced into Tasmanian waters.
Florfenicol is commonly used in aquaculture to treat bacterial infections in fish. However, the Greens said the volume reported at this particular lease is an alarm bell for the industry. The party is calling for more comprehensive disclosure of antibiotic use across all salmon farming operations in the region.
Industry representatives have not yet provided a detailed response to the specific volume of medication used at the site. The Greens and associated experts said the current level of reporting is insufficient to ensure the protection of the marine environment [2].
“Almost three tonnes of the antibiotic florfenicol were used at one Tasmanian salmon farm lease over a two-month period.”
The disclosure of high antibiotic volumes at a single site suggests a potential systemic issue in aquaculture management. If similar levels of florfenicol are being used across the eight undisclosed sites, the cumulative environmental impact could be significantly higher than currently understood, potentially accelerating the rise of antibiotic-resistant bacteria in the ocean.
