Review identifies northern Australia as a green sawfish stronghold

A peer-reviewed review led by Murdoch University researchers has identified northern Australia, particularly Western Australia’s Pilbara region, as one of the last major strongholds of the critically endangered green sawfish, Pristis zijsron. The review synthesised decades of research on the species to consolidate existing knowledge and identify the evidence still needed for effective recovery planning. It found that the species has disappeared from large parts of its historic range, including areas of Africa and southern Asia, while northern Australia continues to support some of the last relatively intact populations anywhere on Earth. This is a conservation stronghold based on the available records, not the result of a new field survey or an emerging trend revealed by the study.

Green sawfish are distinguished by elongated, shark-like bodies and tooth-lined “saws” extending from the front of their heads. The review reports that overfishing and habitat loss have driven the species toward extinction. Australia has been the global leader in green sawfish research, partly because populations have been wiped out in many other countries while green sawfish continue to occur in Australia. The review also found that Australian researchers have led almost every major subdiscipline of research related to the species. Postdoctoral Research Associate Jack Ingelbrecht said opportunities to study green sawfish have been greater in regions where relatively high numbers remain. The review’s broader aim was to provide an accessible resource for conservation experts and researchers so that recovery initiatives can be based on a clearer understanding of the species.

Despite Australia’s research leadership, the review identified major gaps in information most relevant to conservation. Little is available about the size of remaining populations, the locations of critical habitat and the number of mature individuals present in the wild. These uncertainties limit the ability of conservation programs to be tailored to the species and the areas where it persists. The pressures linked to the global decline are less severe in northern Australia, and Associate Professor David Morgan, who has led sawfish research in Australia for more than 25 years, said the Pilbara supports relatively healthy populations and critical habitat. The region therefore provides an opportunity to study how green sawfish use their environment and to identify which conservation measures may best facilitate recovery. The review presents these as priorities for investigation; it did not test a particular recovery measure or demonstrate the success of an intervention.

The authors said Australia’s position at the centre of international sawfish research also gives the country an increased responsibility to support recovery through scientific input. “Research is the lifeblood of conservation,” Ingelbrecht said, adding that conservation biologists bear responsibility for improving the research on which recovery initiatives depend. Despite the knowledge gaps, the researchers expressed optimism that the species could survive with appropriate support, research and conservation measures. The review, titled “The Critically Endangered green sawfish (Pristis zijsron): current knowledge and future directions,” was published in Reviews in Fish Biology and Fisheries. By consolidating what is known and identifying unresolved questions, it offers a foundation for future research rather than evidence that any specific action has already restored green sawfish populations.

Subject of Research: Green sawfish conservation status and research priorities in northern Australia

Article Title: Northern Australia is a ‘lifeboat’ for critically endangered green sawfish

Article References: Northern Australia is a ‘lifeboat’ for critically endangered green sawfish. Original publication (Bibliographic details unavailable.)

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Keywords: green sawfish, Pristis zijsron, conservation, northern Australia, Pilbara, Western Australia, endangered species, sawfish research, habitat protection, overfishing, Northern, Australia