The most recent estimate puts the remaining numbers of vaquita, a porpoise found only in the waters of the Sea of Cortés, Mexico, at just 60, down from 100 two years ago…. The vaquita has been a victim of the shrimp and totoaba fisheries, showing up as bycatch in gillnets.
The totoaba is also an endangered species but its swim bladder is a delicacy in China, selling for as much as US $5,000 per kilogram in the U.S. and a great deal more in China. The matter has been taken up by Agriculture Secretary José Calzada Rovirosa with Chinese officials in an effort to stop the illegal consumption of the bladders. Vaquitas are not only being killed by totoaba fishing. When illegal fishermen are pursued by the Mexican Navy, they often cut their nets and set them adrift, becoming an additional threat to the porpoise.
Removing these “ghost nets” will be one of the steps taken before the implementation of an assisted breeding program, said marine mammal expert Lorenzo Rojas Bracho from the National Institute of Ecology and Climate Change.
There are doubts about the feasibility of a breeding program as well as concerns about the risk. “We have no idea whether it is feasible to find, capture and maintain vaquitas in captivity much less whether they will reproduce,” said vaquita expert Barbara Taylor of the U.S. National Oceanic and Atmospheric Administration.
Excerpt from Assisted breeding for endangered vaquita?, Mexico News Daily, June 28, 2016