The vaquita (Phocoena sinus) is a small porpoise found only in the northern Gulf of California. A joint Mexican survey in 2025 used acoustic monitoring and visual observations. The official report gave a 67% expert-elicitation probability that the number of vaquitas observed was between seven and ten, and observers reported at least one or two calves.
That result updates the evidence, but the phrase “seven to ten” should not be treated as a perfect census of all vaquitas alive. Researchers survey a defined area over a limited time. Some animals may be underwater, outside the observation zone or otherwise undetected. The result is a carefully qualified estimate of animals observed, not a guarantee that no other vaquitas remain.
Evidence note: detections and total abundance are different measures
Acoustic detectors record clicks that indicate vaquita presence; visual observers can estimate sightings and document calves. The 2025 Mexican release describes a 67% expert-elicitation probability for seven to ten observed individuals. Neither a click nor a sighting alone identifies every living animal, and an observation range should not be silently converted into an exact population total.
A porpoise confined to one corner of a gulf
Vaquitas live in shallow waters of the Upper Gulf of California, in Mexico. They do not migrate between distant oceans, and there is no other population elsewhere that could replenish the group. This small range makes local fishing practices and enforcement central to their survival.
The species is a porpoise, not a dolphin, although both belong to the toothed whales. Its dark patches around the eyes and mouth help identify it in clear photographs, but field encounters can be brief. Acoustic monitoring is especially useful because vaquitas are difficult to see consistently from a ship.
Why gillnets kill vaquitas
Vaquitas are not usually targeted by fishers. The primary documented danger is bycatch: an animal becomes entangled in a gillnet set for fish or shrimp and cannot reach the surface to breathe. Illegal nets targeting totoaba are a particularly serious part of this threat. Totoaba swim bladders are valuable in illegal trade, and vaquitas can be caught in the same gear.
The important distinction is between the target and the outcome. A net may be set for another species, but that does not make the resulting vaquita death harmless or accidental in a policy sense. Avoiding entanglement requires preventing the use and loss of dangerous nets in vaquita habitat, enforcing rules and working with fishing communities on viable alternatives.
What changed in the 2025 report
Survey teams combined acoustic and visual methods during the 2025 work. Acoustic records help locate areas of activity; visual encounters provide information about how many animals were seen and whether calves were present. The official result was more encouraging than some earlier observations because it included repeated sightings and young animals, but it does not demonstrate population recovery by itself.
To show a sustained recovery, researchers would need comparable evidence across multiple years, alongside reduced net mortality. A calf observed in one survey is evidence that reproduction occurred, not proof that enough young survive to adulthood to offset deaths. The 2026 Mexican programme is training observers for a further survey effort planned for 2027, while acoustic monitoring continues to inform where teams search.
Protection depends on more than a boundary
Protected areas and gillnet restrictions are useful only when they reduce dangerous fishing in practice. Monitoring equipment can be removed or damaged, enforcement can be difficult, and restrictions affect local livelihoods. Conservation therefore involves ecological evidence and human governance together: credible monitoring, effective patrols and fishing methods that do not trap porpoises.
Other endangered-species programmes show how local habitat and community work can shape outcomes. The gharial conservation programme faces a different set of biological pressures, but it likewise shows why protection has to connect field monitoring with management of the places animals actually use.
What a meaningful sign of hope looks like
The vaquita is still present, and the 2025 observations included calves. Those facts matter. The long-term test, however, is whether animals continue to survive and reproduce while gillnet deaths fall. A survey result can guide action, but it cannot substitute for action in the water.
It is reasonable to describe the findings as hopeful and still fragile. Calling the species doomed ignores evidence of persistence; calling it safe overreads a limited survey. The clearest account keeps the distinction visible: researchers observed a small number of vaquitas, reproduction was observed, and preventing entanglement remains essential.
Frequently asked questions
How many vaquitas were observed in 2025?
Mexico’s 2025 survey reported a 67% expert-elicitation probability that seven to ten individuals were observed, with at least one or two calves. This is not an exact census of every animal alive.
Where do vaquitas live?
Vaquitas are endemic to the northern Gulf of California in Mexico. No other wild population is known.
Why do gillnets kill vaquitas?
A vaquita can become entangled and drown because it cannot surface to breathe. Nets set for totoaba and other fisheries can create this bycatch risk.
Do the observed calves prove that the species is recovering?
They show that reproduction occurred, but one survey cannot establish a sustained recovery. Repeated survival and reproduction, together with lower net mortality, would be needed.