Inside the Last Patrol: Saving the Vaquita

The Mexican Navy Zodiac cuts its engine a half-mile from the shore, and the silence that follows is more terrifying than any engine noise. Commander Elena Vásquez pulls out a pair of binoculars and scans the flat grey water of the northern Gulf of California. "Three years ago, we would have seen them by now," she says, lowering the binoculars. "We were still seeing them three years ago."

The vaquita marina—the world's most endangered marine mammal—is dying in silence, and with perhaps ten individuals left as of early 2026, every patrol that doesn't spot one is a patrol that raises the dread that it already might be too late.

The vaquita is a small porpoise, rarely exceeding 1.5 meters in length, found only in the northern Gulf of California. It was formally described by science only in 1980, which means it may become extinct before most people alive today have even heard its name. It is a victim of its own habitat: the same shallow, murky lagoons where it makes its home are also the hunting grounds of illegal gillnet fishers targeting another critically endangered species—the totoaba, a large fish whose swim bladder commands extraordinary prices on the black markets of China and Hong Kong.

A single totoaba swim bladder can sell for as much as $10,000 on the black market, making it worth more by weight than cocaine. And for every totoaba caught in an illegal gillnet, a vaquita dies too—accidentally tangled in the mesh, unable to reach the surface to breathe. The gillnets are illegal. The totoaba is illegal. The trade in totoaba bladders is illegal. And yet the patrols continue to find them, cut them from the water, and arrest the fishers.

"We have removed over 1,000 kilometers of gillnet from this water in the last two years," says Commander Vásquez, gesturing to the shoreline of Sonora state. "But we are one boat, and they come at night, from many places." The Mexican government declared a permanent gillnet ban in the vaquita's range in 2015, but enforcement has proven nearly impossible in one of Mexico's most lucrative illegal wildlife trades. The ban has driven the price of totoaba bladders even higher, making the reward for illegal fishing increase even as the risk has risen.

The Sea Shepherd Conservation Society, the radical environmental group that has operated in the Gulf of California since 2015, pulled out its ships in 2023 after a decade of sometimes violent confrontations with illegal fishers, citing safety concerns and what it called insufficient government support. Without Sea Shepherd's fleet anchoring the no-go zone, the illegal gillnetters have returned in force.

Dr. Ana María García, a marine biologist with Mexico's National Polytechnic Institute who has studied the vaquita for 22 years, has recorded the species' distinctive echolocation clicks using underwater microphones anchored throughout the vaquita's range. "In 2015, we were hearing them everywhere," she told me from her lab in Ensenada, playing a recording that crackled with the vaquita's unique high-frequency clicks. "Now, most of our listening stations go weeks without a single detection. When we do hear them, it is usually a single individual, alone."

The loneliness of the vaquita's final moments, if they are alone, is something that haunts the people who study them. Unlike many social cetaceans, vaquitas do not mass strand or die together. They slip away one by one, their bodies rarely found, their disappearance gradual enough to be mistaken for the natural quiet of an empty sea.

There is a proposal, backed by a coalition of international conservation organizations, to capture the remaining vaquitas and place them in a sea pen where they could be protected, fed, and potentially bred under human care. It would be an extraordinary intervention, and an extraordinarily expensive one. It would also be, scientists acknowledge, the last throw of the dice. Every previous attempt to capture a vaquita for any purpose has failed, with the animals dying from stress. The species is extraordinarily sensitive to handling, a product of having evolved without significant predators.

"We have one chance," says Dr. García quietly. "Maybe one. If the vaquita is to survive, we must be willing to do something we have never done successfully before. And we must do it soon, before there are none left to save."

Commander Vásquez resumes the patrol. The engine hums back to life. The water ahead is empty, shimmering in the afternoon heat, and the vaquita's last refuge stretches silent in every direction.