The government has cut funding aimed at taking fishing boats out of service or adopting vaquita-friendly equipment.
BBC: Finance woes put porpoise at risk
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Only about 150 vaquita are left, and about 30 are dying each year through becoming entangled in fishing nets.
BBC: Finance woes put porpoise at risk
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The vaquita, which is also the world's smallest cetacean, is emblematic of the plight of other dolphins and porpoises around the world, say campaigners.