Before the Tide Turns
Australia has some of the world’s cleanest commercial seafood. One marine scientist is racing to keep it that way.
Nina Wootton counts microplastics for a living. She’s found them in the guts of fish pulled from Australian waters, in oysters and crabs, and in surf zones up and down the South Australian coast.
Her advice, if you ask what all of this means for what you put on your plate? Eat more fish.
“Australian seafood is some of the cleanest in the world,” says Wootton, a marine ecologist and postdoctoral researcher in the Southern Seas Ecology Laboratories at Adelaide University. Her research shows Australian oysters carry 15 times fewer microplastic particles than the global average; Australian fish, 3.5 times less.
The trouble, according to Wootton, is that the longer we fail to stem the endless flow of plastic waste entering Australia’s waterways, the more the country’s hard-won lead over contamination levels elsewhere will narrow. Global plastic production is set to double by 2030, but only nine percent of plastic waste is currently being recycled. The rest ends up in landfill, waterways, and eventually the marine environment that Australia’s seafood industry depends on.
Misplace the worry, she says, and the blame lands in the wrong place — on the fish, instead of on the plastic being produced in volumes that make this problem inevitable. “Seafood is not the major contributor to human exposure. It’s just that the amount of attention it gets in the media is not warranted compared to our other avenues of exposure.”
Wootton is fighting to keep that tide from becoming a flood: building the measurement standards needed to turn science into policy, testifying before the ongoing Australian Senate inquiry, and taking her research directly to the fishing communities and Aboriginal and Torres Strait Islander rangers closest to the consequences.
The Stakes
Microplastics have been detected in human blood, in placental tissue, in the brain, in lung tissue — on every continent. A recent study Wootton co-authored found that seafood contributes roughly one to 10 microplastic particles to human exposure per day. Every breath of indoor air, in comparison, delivers at least one.
What those particles are doing to our bodies once ingested is, for the most part, still being worked out. “We know it’s in the heart,” Wootton says, “and yes, some of these people have heart attacks. But is it caused by that? Unknown.”
Approaching the problem from reproductive biology rather than marine science is Rebecca Robker, a professor, biomedical scientist, and fertility researcher also based at Adelaide University. Robker studies how environmental contaminants — including microplastics and their additives — compromise egg cell quality, fertilization, and early fetal development.
Establishing what microplastics actually do in the human body is, Robker says, a problem the field has yet to solve. “In humans, it’s only ever correlative,” she says. “You cannot do the type of controlled experiments you can in animals — you’re not going to give people high doses of microplastics to test. And so people take issue with that: Is there really a problem if it’s only a correlation?”
Part of the challenge is the chemistry itself. Plastic isn’t a single substance but a matrix of compounds — many likely harmless, others carrying well-established risks. Among the most concerning are PFAS (per- and polyfluoroalkyl substances) and phthalates, common additives that accumulate in living tissue over time. In the case of PFAS alone, there are approximately 18,000 variants; only a handful are routinely tested for, with substitutes routinely introduced without assessment of their effects on human health. These substances are not chemically inert — they leach into the surrounding biology and are known to disrupt the hormonal signaling that governs development and reproduction.
What concerns Robker the most is the cumulative effects of exposure over generations. Microplastics have been detected crossing the placental barrier, a membrane whose specific function is to protect the fetus from what’s circulating in the mother’s blood, and their accumulation there has been linked to lower birth weight in growth-restricted pregnancies.
That kind of damage, as Robker describes it, accumulates over decades — long before the evidence catches up. “If [PFAS exposure in utero] affects someone’s fertility when they’re 30 years old — that’s going to take a very long time and be very complex to sort out.”
“If PFAS exposure in utero affects someone’s fertility when they’re 30 years old — that’s going to take a very long time and be very complex to sort out.”
The Standard
Wootton’s chosen field is barely twenty years old — the word “microplastics” was only coined in 2004 — and the methods sprawled before anyone thought to standardize them. Two scientists studying the same questions can reach opposite conclusions without either being wrong because they're measuring different things in different ways. “Everyone uses a toothbrush,” jokes Wootton, “but they all like the toothbrush that they use.”
Wootton’s response was to build the standard that didn’t exist, without waiting for a mandate that might take another decade to arrive. Together with fellow marine ecologists Patrick Reis-Santos, a research associate at Adelaide, and Bronwyn Gillanders, a professor and the Dean of School of Biological Sciences at Adelaide, and a team of 40 researchers across 21 Australian institutions, Wootton produced the first national microplastics field manual, published in Frontiers in Marine Science in 2025. The manual covers sampling protocols, laboratory analysis methods, and reporting standards — the unglamorous scaffolding that lets scientists compare samples from a beach in Queensland to an estuary in Western Australia.
The manual’s scale and diverse contributor base — all of whom participated voluntarily — led to Wootton being asked to testify in March before the Australian government’s Community Affairs References Committee examining Australia’s response to microplastic contamination. She used the opportunity to push for a stricter list of banned plastic additives — thousands of compounds are in common use, but only a handful appear on Australia’s banned substances list despite being internationally recognized as harmful — as well as for a funded interdisciplinary research cohort and clearer government messaging about exposure pathways.
While the final Senate report has yet to be published, Wootton has done what she can — built the data, standardized the methods, and made the argument in person. But she understands, better than most, that the rising tides of pollution won’t pause for the outcome. “The data always influences policy,” she says, “if you pitch it in the right way.”
The Long Game
On the beaches of East Arnhem Land and the Tiwi Islands, the plastic doesn’t wash up quietly, and it doesn’t stop coming — a problem the local rangers, whose caring-for-country practice includes beach cleans, understand viscerally. “You’ll be walking on the beach and instead of shells underneath your feet, it’s plastic crunching,” Wootton says. Most of it blew in from Indonesia and Timor on ocean currents, produced elsewhere and deposited on Australian shores.
That distinction between who produces the plastic and who lives with it is precisely what Wootton’s community education work is designed to make visible. Her Toys for Turtles program takes beach cleans and miniature recycling machines into homeland schools across both territories. Students collect beach plastic, shred it, and press it into molds — keychains of turtles and other local creatures under threat from the waste.
The initiative has since grown beyond the classroom. One ranger group approached Wootton with an idea: Could she help them design a mold for a soap dish, to sell alongside their existing line of bush soaps and essential oils? Toys for Turtles now has a commercial arm — turning beach plastic that would otherwise be discarded into locally made products with a story behind them. “Instead of just getting rid of it,” Wootton says, “they’re turning it into something. It’s creative and fun but also has an educational benefit.”
The program’s central lessons are the same ones Wootton argues around the dinner table: the plastic on this beach didn’t come from here, and it can be stopped at the source. Fish don’t produce plastic, plastic producers do. Government attention may ebb and flow, but a community that genuinely understands where the problem originates is harder to distract. That understanding, Wootton believes, is what makes education the most durable tool she has.
“I’m a big advocate of education and awareness, and that’s how you make change,” she says. “Hopefully that can sort of put pressure on the higher-up government bodies that can actually make a difference.”
Solving such a widespread environmental problem demands a particular kind of institutional support: not grants or directives, but time. What Adelaide University gives Wootton is the one thing the problem doesn’t offer: room to think.
“It’s hard being an early career researcher,” Wootton says. “So many people are moving contract to contract or postdoc to postdoc — they’re really not able to do what they want to do. But I have a very secure contract right now, which gives me so much freedom to be able to go and chase my dreams.”
“Adelaide University’s research impact goes beyond publications,” says Professor Anton Middelberg, Deputy Vice Chancellor - Research and Innovation. “It focuses on real-world outcomes for society and the economy and is aligned to local, national and global priorities.”
“They will just believe in you,” Wootton adds.
The rising tide of plastic accumulating in Australia’s waterways doesn’t pause while scientists negotiate short-term contracts. Better measurement, stricter policy, and community education are the tools for genuine change — without scientists like Wootton, even the cleanest waters in the world will eventually reflect what’s being produced everywhere else.
“You have to turn the tap off,” Wootton says, “or you will just have to keep cleaning up the stuff that’s coming out the other end.”
This content was paid for and created by Adelaide University. The editorial staff of The Chronicle had no role in its preparation. Find out more about paid content.
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