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The vaquita, the world’s most endangered marine mammal, has edged closer to extinction. There are no more than around 10 of the small porpoises still alive,  published yesterday, down from 30 in 2017 and around 600 two decades ago.

Worse still, their number could have fallen further, as the campaign group Sea Shepherd that one of its vessels’ crews had found a dead animal they believed is a vaquita. The animal hasn’t yet been formally identified but a necropsy is under way and results are expected today, the group told New ������ý.

The porpoise is found only in the northern Gulf of California, where it has retreated into the southwestern corner of its refuge.

The species’ decline has been driven by demand in China for the swim bladder of the totoaba fish, which fishing vessels catch with illegal gill nets, hanging curtains of netting. Vaquita can become entangled in these nets.

Despite efforts at international forums to save the porpoise, the International Committee for the Recovery of the Vaquita (CIRVA) estimated the species had declined by 50 per cent in the past three years. “This precipitous population decline has continued despite the actions taken by the government of Mexico,” according to the report by the committee, which advises Mexico on the species.

The group is urging Mexican ministers to take immediate action, including funding and expanding efforts to remove nets, protecting net removal teams, stepping up surveillance and arresting anyone fishing illegally.

Those who flout a ban on gill nets have proved dangerous and damaging, not just to the vaquita, but to those trying to protect the mammals. Sea Shepherd said one of its ships was attacked while patrolling the species’ refuge in January.

Conservation efforts have also been hit by the loss of acoustic monitoring instruments, CIRVA said, with 32 such devices lost in November and December 2018 alone, at a cost of nearly $32,500.