When I wrote about the emergency approval for the antibiotic florfenicol in Tasmanian salmon farming, the central concern was simply that using a broad-spectrum antibiotic in an open marine system carries risks that are hard to contain and even harder to undo.
We are now seeing what that risk looks like in practice.
New testing by the Institute for Marine and Antarctic Studies for the Tasmanian Department of Natural Resources and Environment (NRE) has found trace detections of florfenicol in wild marine species, including abalone and rock lobster, at distances of up to approximately 10.6 kilometres from treated salmon pens, according to interim monitoring data published by the regulator.
This is no longer a question of what happens “near” farms. It is evidence that an antibiotic administered in aquaculture is moving through the wider marine environment and into wild fisheries.
In response to this new information, the Australian Pesticides and Veterinary Medicines Authority (APVMA) has issued a formal statement proposing to suspend the emergency permit that allowed florfenicol to be used in Tasmanian salmon.
The APVMA states:
“At the request of the APVMA, the Tasmanian Department of Natural Resources and Environment (NRE) provided new information reporting that very low-level detections of florfenicol amine in some non-target/wild fisheries species have been found at various distances from the salmon leases. After reviewing this data, the APVMA has advised the permit holder that it proposes to suspend this permit. The permit holder has been notified that they have until Monday 2 March 2026 to provide evidence to satisfy the trade criteria.”
In plain terms, the regulator is now saying: show cause, or the permit will be revoked.
That is not a minor procedural step. It is an acknowledgement that the situation has changed in a meaningful way.
The Tasmanian Government has responded cautiously to the new findings, with a government spokesperson stating that the state continues to support the current testing and monitoring program and is working with both the salmon industry and the wild fisheries sector to protect market confidence and trade outcomes, according to media reporting.
At the same time, political reactions have been more direct. The Tasmanian Greens, including leader Dr Rosalie Woodruff MP, have publicly called on the Premier and the state government to take stronger action, arguing that the detection of florfenicol in wild species highlights the risks of using antibiotics in open marine systems and the need to prioritise the protection of wild fisheries and export markets.
Independent MPs have also weighed in, with statements welcoming the APVMA’s proposal to suspend the permit and framing it as a necessary step to safeguard Tasmania’s marine environment and public confidence in seafood safety.
Together, these responses underline that this is no longer just a technical regulatory issue. It has become a matter of public confidence, environmental stewardship, and how Tasmania balances industrial aquaculture with the long-term health of its shared marine ecosystems.
When emergency approval was granted for florfenicol, reassurances were made about controls, dilution, and limited environmental impact. The assumption — explicit or implied — was that any residues would remain close to the farms and at levels that posed no broader risk.
Finding residues over 10 kilometres away in wild species challenges that assumption directly.
Distance matters here, not because anyone is suggesting these are immediately toxic levels, but because it demonstrates transport, persistence, and exposure pathways that extend far beyond the lease boundaries. Once a drug is detectable in mobile wild species, it is no longer just an aquaculture management issue. It becomes a whole-of-ecosystem issue.
Rock lobster in particular sit at the centre of this conversation for two reasons. They are ecologically important and part of complex food webs, and they are also economically and culturally important, supporting wild fisheries and export markets that rely on confidence in clean, uncontaminated product.
Even “very low-level detections” matter when we are talking about antibiotics entering wild systems, because the risks are not limited to direct toxicity. They include the potential contribution to antimicrobial resistance in marine environments, chronic low-level exposure across multiple species, trade and market confidence impacts for wild fisheries, and the long-term difficulty of reversing contamination once it becomes widespread.
This is why the APVMA’s focus on “trade criteria” is so telling. It signals that the issue is no longer just about farmed fish health, but about wider consequences for Australia’s seafood reputation and market access.
Emergency permits exist for a reason: to deal with short-term, exceptional circumstances. They are not meant to quietly evolve into business-as-usual approvals in open environments where the consequences are shared by everyone else who uses and depends on that ecosystem.
The fact that the APVMA is now proposing suspension tells us that the original risk profile has changed. This is how regulation is supposed to work. New evidence comes in, and decisions are revisited. But it also raises an uncomfortable question: why are we repeatedly finding ourselves in a position where the real environmental footprint only becomes clear after the fact?
Open-net salmon farming does not happen in a closed system. Whatever is added to the water does not stay neatly inside a line on a map. Nutrients, chemicals, parasites, and now antibiotics move with currents, sediments, and living animals.
The detection of florfenicol residues in wild species kilometres away from farms is not an anomaly. It is a reminder of how porous these systems really are.
It would be a mistake to treat this as a narrow technical dispute about florfenicol alone.
The deeper issue is this: we are using powerful pharmaceutical tools in open ecosystems and then acting surprised when they don’t stay put.
From a wildlife and conservation perspective, that should concern all of us. Once antibiotics enter marine food webs, they do not just affect target pathogens in farmed fish. They interact with wild bacterial communities, sediment ecosystems, invertebrates, fish, and predators, and potentially with the long-term microbial balance of entire regions.
These are slow, complex systems. Damage does not always show up as a dramatic event. Sometimes it shows up as gradual shifts we only recognise years later, when reversing course is no longer easy or even possible.
The salmon industry now has until 2 March 2026 to convince the regulator that continued use of this permit does not jeopardise trade and safety standards. That process should be transparent, evidence-based, and open to public and independent scrutiny.
This is not about scoring points or demonising individuals. It is about whether we are willing to draw a clear line when new evidence shows that environmental risks are broader than first claimed. If the permit is suspended, it will not be an overreaction. It will be a proportionate response to new data.
And if it is not suspended, then the justification should be strong enough to withstand serious, independent examination — because what is at stake is not just one industry’s operational convenience, but public trust in how we manage shared marine ecosystems.
Tasmania’s wild fisheries, coastal ecosystems, and marine wildlife are not collateral. They are not buffers for industrial risk. They are living systems that underpin livelihoods, food security, and biodiversity.
Finding antibiotic residues in wild species kilometres away from their point of use should mark a clear turning point. It is a reminder that in open ecosystems, there is no such thing as a neatly contained intervention.
At the very least, it should force harder questions about how “emergency” chemical use is assessed, monitored, and, when the evidence changes, brought to an end.
Tasmania’s marine environment is a shared responsibility. Looking after it means accepting that decisions made for short-term convenience can carry long-term consequences, and that stewardship is measured not by how quickly we respond to problems, but by how carefully we avoid creating them in the first place.
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