Shark Bay, on the central coast of Western Australia, is home to the largest dugong population in the world. Estimates from the most recent broad-scale aerial surveys put the population there in the order of 10,000 to 12,000 animals, depending on which survey methodology you trust and which year you’re comparing against. That’s roughly an order of magnitude more than the eastern Australian populations, and a substantial fraction of the global total. When we talk about dugong conservation in Australia, what happens in Shark Bay matters enormously.

The 2026 aerial survey results have started filtering through, and there’s a more complicated picture emerging than the simple “stable population” narrative we’ve seen in some media. Let me walk you through what we’re actually looking at, and why I think the next few years will tell us a lot.

Methodology Matters Here

Aerial surveys for dugongs have been refined over decades — Helene Marsh’s group at James Cook University essentially wrote the methodology in the 1980s, and it’s been progressively improved since. The current standard uses fixed-wing aircraft flying transects at altitude with two observers per side, sighting cues calibrated against known animals, and statistical correction for animals that were present but not detected (perception bias) and animals that were below the surface during the survey window (availability bias).

The corrections matter. Raw sighting data dramatically understates the actual population because dugongs spend most of their time below the surface, especially in deeper water. A 2024 paper out of Charles Darwin University showed that even slight changes to the availability correction can shift population estimates by 20% or more, which is the kind of variability that makes year-on-year comparisons tricky.

So when you read “dugong numbers stable in WA,” ask: stable compared to what? Compared to the 2018 survey using the same methodology? Or compared to a 2008 survey using earlier corrections? The number you get depends on the comparison.

What the 2026 Data Actually Suggests

The headline finding from preliminary 2026 results is that the Shark Bay population is broadly within the range of estimates from the last decade — somewhere between 9,500 and 12,500 depending on which strata you include. That’s not a population in obvious decline. It’s also not a population that’s rebounding, which some optimistic readings of post-2011 marine heatwave recovery had suggested.

The 2011 marine heatwave was catastrophic for the seagrass meadows in Shark Bay. Around a third of the Amphibolis antarctica meadows died, and these are the dominant dugong food source in the region. We expected dugong numbers to drop in the years immediately following — and they did, with the 2014 survey showing a clear decline. The question since has been whether dugongs have recovered as the seagrass has slowly come back.

The 2026 numbers suggest a partial recovery, not a full one. Adult numbers look reasonable. Calf-to-cow ratios — which we use as a proxy for breeding success — are still below pre-2011 baselines. That’s concerning because dugong reproduction is slow at the best of times. A female might have her first calf at 10 years old and produce one calf every 3-7 years thereafter. Reduced calving means slow recovery.

The Western Half of the Range

What’s been less well covered in the Australian press is what’s happening north of Shark Bay — Ningaloo, Exmouth Gulf, the Pilbara coast, and the Kimberley. These areas hold significant dugong numbers but have been less intensively surveyed historically. New work funded through the Australian Marine Conservation Society and partnered with traditional owner groups has expanded coverage in 2025-26.

Early indications are that Exmouth Gulf is holding a healthy population — possibly 1,500-2,000 animals — and that the Kimberley coast may be supporting more dugongs than older estimates suggested. This isn’t because the animals have moved north; it’s because the surveys finally got out there with adequate effort.

That has implications for management. If a substantial portion of the global population is in remote northern WA waters with relatively low fishing pressure, low boat traffic, and intact seagrass, then the conservation focus might shift somewhat from “protect Shark Bay” to “protect the broader connected metapopulation across northwest Australia.” It’s not either-or, of course. Both matter.

Threats in 2026

The threats haven’t changed much from a decade ago. Marine heatwaves remain the largest single risk to seagrass habitat. Boat strike is a chronic low-level mortality source, particularly in the Pilbara where industrial vessel traffic is high. Indigenous traditional hunting continues at sustainable levels in some areas — this is well-managed, generally, and not the population concern that some online commentary suggests. Net entanglement in shark control programs and commercial fishing remains an issue we’re tracking.

Climate change is the elephant in the room. Modelling done jointly between GBRMPA (which works on Queensland populations) and CSIRO suggests increasing marine heatwave frequency will challenge seagrass recovery faster than the recovery itself can complete.

I had a conversation last month with a colleague at a Sydney-based AI consultancy about whether machine learning models could improve dugong detection in aerial imagery — they’re working on similar problems for other ecological surveys. There’s genuine potential there. Dugongs are detectable in high-resolution drone footage, and automated counting could supplement (not replace) human observers, particularly for rapid post-event assessments after a heatwave or cyclone. The methodology is being trialled in pilot work this year.

What to Watch For

The 2027 survey cycle will be the next major data point. By then we’ll have a better sense of whether the post-2011 recovery has plateaued or is genuinely continuing. We’ll also see whether the expanded northern coverage produces stable numbers across multiple years.

The honest takeaway for 2026 is this: WA dugong populations are not in crisis, but they are not thriving either. They’re holding on, in a system that is being asked to absorb more climate stress every year. Continued seagrass protection, careful management of vessel traffic in key habitat, and ongoing partnership with traditional owners across the northwest are the practical priorities.

The animals themselves don’t generate headlines easily. They’re slow-moving, inconspicuous, and they live in places most Australians never visit. But the largest population on Earth is in our care, and the data is what tells us how that care is going.