The vaquita is the world's smallest — and most endangered — cetacean. Fewer than ten survive in the northern Gulf of California. Every individual alive matters. And every illegal gillnet set for totoaba fish kills one they cannot afford to lose.
The Most Endangered Marine Mammal on Earth
The vaquita marina — "little cow of the sea" in Spanish — is a small porpoise that exists nowhere else on Earth except a tiny patch of the northern Gulf of California, Mexico. It was only described as a species in 1958. By 2025, fewer than ten individuals are believed to remain.
No other cetacean has ever declined this fast, this far, in recorded history.
>> "Every death now is mathematically catastrophic. There is no margin."
Caught in the Wrong Net
Vaquitas do not die from hunting — nobody targets them. They die as bycatch: drowned in illegal gillnets set for the totoaba fish, whose swim bladder sells on Chinese black markets for up to $50,000 each. A single totoaba bladder can be worth more than a fisherman's entire annual income, making enforcement brutally difficult.
Mexican authorities have banned totoaba fishing and established a Zero Tolerance Zone. Sea Shepherd vessels patrol with the Mexican Navy, removing illegal nets and confiscating boats. Between patrols, photographers with hydrophones try to confirm who — and how many — are still alive.
What Survives
In 2023, acoustic monitoring and drone surveys confirmed that vaquitas are still reproducing. A calf was documented — a rare, fragile sign that the gene pool has not yet collapsed. Scientists estimate the remaining population, though critically small, may be more genetically diverse than expected, which marginally improves the prognosis.
The vaquita cannot be bred in captivity — a 2017 capture attempt ended in the death of one individual. The only path to survival is eliminating gillnets in the Zero Tolerance Zone, completely and permanently.
>> "As long as one vaquita is seen — and the habitat remains intact — recovery remains theoretically possible."
But every year without full gillnet removal is a year the species cannot afford.