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In the murky waters of the Gulf of California, a small porpoise is making its final stand. The vaquita — "little cow" in Spanish — is the world's most endangered marine mammal. Illegal gillnets set for totoaba fish, whose swim bladder fetches tens of thousands on the black market, have pushed this species to the brink of extinction.

The threat: Mexican illegal fishing operations targeting totoaba for the Chinese traditional medicine market. One net, one vaquita. That's all it takes.

Your action this week: Avoid any seafood products sourced from the Gulf of California unless certified sustainable. Share this issue with three people who care about ocean conservation.