Nicknamed âpanda of the seaâ for their small size and beguiling facial markings, vaquitas have been in decline for decades, dying by the hundreds in gillnets intended for commercially valuable fish, as well as for an endangered fish called totoaba. When international crime cartels discovered a lucrative trade in the swim bladders of totoaba, illegal gillnetting went rampant, and now the lives of the few remaining vaquitas hang in the balance.