Green sawfish, a ray distinguished by its long, tooth-studded snout, may now be extremely rare in Sri Lankan waters and could be close to local extinction. The IUCN Red List now flags the species as “possibly extinct” in the country, yet a peer-reviewed study drawing on interviews with coastal fishers found that rare encounters still occur, mostly as accidental bycatch. The gap between official extinction warnings and scattered fisher reports raises a difficult question: is there still time to confirm whether a remnant population survives before it vanishes for good?
A Species on the Edge Across Its Range
All five species in the sawfish family Pristidae rank among the most threatened marine fishes on Earth. A reassessment published in the conservation journal Oryx by IUCN Shark Specialist Group authors reports that every sawfish species carries a Critically Endangered designation, with each showing inferred or suspected population reductions of at least 80% over three generations. The drivers are familiar: fishing pressure, habitat degradation in coastal estuaries, and the sawfish’s own biology, which makes its elongated rostrum especially prone to entanglement in nets.
Green sawfish, classified under the binomial Pristis zijsron, faces some of the steepest declines within this already dire group. The species once ranged across shallow Indo-West Pacific waters, but its dependence on nearshore and estuarine habitats placed it directly in the path of expanding fisheries. The U.S. Fish and Wildlife Service notes that the toothed rostrum, while an effective feeding tool, becomes a lethal liability in gillnet fisheries, where the saw tangles easily and prevents escape.
Sri Lanka’s “Possibly Extinct” Designation
Within this global picture, Sri Lanka stands out as a cautionary case. The formal IUCN assessment for green sawfish, conducted by specialist group experts, lists the species as “possibly extinct” in Sri Lanka. That label sits just short of confirmed local extinction and signals that no verified scientific records have emerged in recent years, even as the possibility of survival cannot be entirely ruled out.
What makes the Sri Lankan situation distinct is the apparent absence of systematic, publicly documented government-led surveys. No official population estimate appears to be publicly available for sawfish in the country’s waters, and fisheries authorities have not published readily accessible enforcement data specific to sawfish protections. The IUCN assessment relies on inference and threat modeling rather than direct population counts, leaving a significant blind spot. Without dedicated survey effort, the difference between “possibly extinct” and “still present in tiny numbers” remains unresolved.
What Fishers Remember and Still Report
That blind spot is partly why a 2021 study published in Aquatic Conservation: Marine and Freshwater Ecosystems matters. Researchers conducted structured interviews across multiple Sri Lankan coastal sites, collecting local ecological knowledge from fishers who had spent decades working these waters. Drawing on detailed recollections, the study found that the reported median timing of last sightings clustered around the early 1990s, suggesting that the sharpest declines in abundance occurred decades ago.
But the study also revealed something that complicates the extinction narrative. While recent encounters and catches of sawfishes were rare, they had not stopped entirely. Fishers described occasional bycatch events, typically in gillnets rather than through any targeted effort. These accounts do not constitute confirmed biological records, as no genetic samples were collected to verify species identity, but they suggest that at least some sawfish may persist in waters where formal science has largely stopped looking.
The fishers themselves attributed the decline to fishing pressure, a conclusion that aligns with the broader scientific consensus. Steep declines of sawfishes across their global range coincide with intensified fishing activity, and Sri Lanka’s coastal fisheries expanded considerably through the 1980s and 1990s, the same period when most fishers recalled their last sawfish sighting.
The Identification Problem
One reason conservationists hesitate to treat fisher reports as definitive evidence is the persistent challenge of species identification. Sawfishes belong to a small family, but distinguishing between species in the field, especially during a chaotic bycatch event, is difficult even for trained observers. A genetics and taxonomy study published in the Zoological Journal of the Linnean Society addressed this directly, clarifying species boundaries and highlighting how common misidentification has been across the group’s range.
In Sri Lanka, this problem remains unaddressed at a practical level. The 2021 Aquatic Conservation study tested fishers’ identification ability and found that while many could recognize a sawfish in general terms, distinguishing green sawfish from other species was far less reliable. Without genetic sampling from reported encounters, it is impossible to confirm which species fishers are seeing, or whether the animals represent a viable breeding population rather than isolated stragglers.
Why Fisher Knowledge Still Matters
Despite these limitations, dismissing local ecological knowledge would be a mistake. In data-poor regions, fisher interviews often represent the only available baseline for species that were never the subject of formal monitoring programs. The Aquatic Conservation study’s approach, using structured questionnaires, recall timelines, and cross-checks on species recognition, shows how local memories can be converted into semi-quantitative indicators of decline.
Such information cannot replace scientific surveys, but it can guide them. If fishers consistently point to particular estuaries or depth ranges where sawfish were last seen, those hotspots can become priority areas for modern survey tools such as environmental DNA sampling, baited camera deployments, or targeted netting under strict ethical protocols. In this way, the stories of older fishers become hypotheses that scientists can test, rather than anecdotes to be filed away and forgotten.
Fisher knowledge also helps illuminate social dimensions of conservation. Interviews capture not just where and when sawfish were caught, but how fishers perceived their value, whether they were eaten, sold, or discarded, and how attitudes have shifted over time. This kind of insight parallels the role that public-opinion work plays in other policy arenas, where organizations like Pew Research Center use structured surveys to map beliefs and behaviors that numbers alone cannot explain.
Searching for Survivors
If green sawfish still persist in Sri Lankan waters, they are almost certainly present at extremely low densities. That makes traditional survey methods expensive and inefficient. Environmental DNA, which detects trace genetic material shed into the water, offers one promising alternative. By sampling water in former strongholds identified by fishers and testing it for sawfish DNA, researchers could obtain a yes-or-no answer about current presence without needing to capture live animals.
Another avenue is to work directly with fishing communities to improve documentation of rare encounters. Training programs could equip selected fishers with simple protocols: photographing any unusual ray with a saw-like snout, recording location and depth, and preserving a small tissue sample if the animal is already dead. Even a handful of well-documented records could clarify whether green sawfish still enter Sri Lankan nets and, if so, in what life stages.
At the same time, regulators could move ahead with precautionary protections that do not depend on resolving the presence-absence question. Measures such as gear restrictions in key nursery habitats, safe-release guidelines for incidentally caught sawfish, and trade controls on sawfish parts would benefit any surviving individuals while also protecting other vulnerable coastal species.
Extinction Labels and Conservation Choices
The “possibly extinct” tag for Sri Lanka carries symbolic weight. It signals to policymakers and the public that a once-prominent species has likely slipped beyond recovery within national waters. Yet there is a risk that such labels, if interpreted as final, can dampen political will to invest in further research or protection. Why spend scarce resources on a species that is already gone?
Conservation scientists increasingly argue for a more nuanced approach. Declaring a species locally extinct should ideally follow targeted surveys that have a reasonable chance of detecting any remaining individuals. In the case of green sawfish in Sri Lanka, that threshold has not yet been met. The IUCN assessment, grounded in robust threat analysis, nevertheless acknowledges the lack of recent field data and the continued trickle of unverified reports.
This ambiguity leaves room for action. A focused, time-limited effort to search for survivors, guided by fisher knowledge and modern detection tools, could resolve the status question while also building local capacity for monitoring other threatened marine fauna. If no sawfish are found, Sri Lanka would have a stronger evidentiary basis for recognizing a local extinction and using that loss to galvanize protection for remaining coastal biodiversity. If a remnant population does emerge from hiding, even in tiny numbers, there may still be a narrow window to protect its last refuges.
Either way, the story of green sawfish around Sri Lanka illustrates a broader lesson. For slow-breeding, habitat-bound species facing intense human pressure, waiting for perfect data before acting can mean waiting until it is too late. Balancing scientific rigor with precaution, and pairing global assessments with the lived experience of people on the water, offers perhaps the best chance of ensuring that the next generation of fishers has more than fading memories to share.
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*This article was researched with the help of AI, with human editors creating the final content.
