The alarming decline is largely down to the porpoises drowning in gill nets set to capture huge, bass - like fish called totoaba (Totoaba macdonaldi). (scientificamerican.com)
So in 2015, the Mexican government banned the use of gill nets for two years and offered compensation to fishers. (scientificamerican.com)
In April 2015, Mexican authorities announced a $ 70 million plan to ban gill net fishing in about half of the upper Gulf. (dotearth.blogs.nytimes.com)