Vaquita Porpoise: The World's Most Endangered Marine Mammal

The vaquita is the world's most endangered marine mammal — fewer than 10 individuals likely remain. Understanding why it faces extinction and what individual welfare those last animals experience is both urgent and sobering.

Key Facts

The vaquita (Phocoena sinus) is a small porpoise endemic to the northern Gulf of California — its entire range covers about 2,235 km².
Population estimates have collapsed from around 600 in 1997 to possibly fewer than 10 surviving individuals as of recent surveys.
The primary cause of mortality is bycatch in gillnets used to catch totoaba fish — totoaba swim bladders are sold illegally for millions of dollars on Chinese markets.
A 2017 attempt to capture vaquitas for ex-situ protection resulted in the death of one individual from capture stress — a welfare tragedy that ended the programme.
Despite gillnet bans in vaquita habitat, illegal fishing continues — enforcement has been insufficient to halt the decline.
The last surviving vaquitas may now be experiencing the welfare impact of extreme inbreeding and population collapse.

Welfare Considerations

The welfare of the last surviving vaquitas is inseparable from the conservation emergency around them. Individual animals navigating a range overlapping with illegal fishing activity face constant entanglement risk — a slow, drowning death that may be the fate of each remaining individual. The 2017 capture attempt that killed one individual demonstrates how difficult welfare-positive intervention is for a species so sensitive to disturbance. The most welfare-protective action for the remaining vaquitas is elimination of gillnet fishing in their range through enforcement, market intervention targeting totoaba bladder demand, and alternative livelihood support for fishing communities. Each surviving vaquita's welfare is now a matter of international conservation urgency.

What You Can Do

Support Sea Shepherd's Operation Milagro actively removing illegal gillnets from vaquita habitat.
Donate to Vaquita CPR and Earth League International's work targeting the totoaba trafficking network.
Oppose purchase of any product potentially derived from totoaba or vaquita bycatch.
Advocate for stronger US and Mexican enforcement of gillnet bans in the vaquita refuge zone.
Share information about the vaquita's critical status — public awareness creates political pressure for the enforcement that can save the last individuals.