In the upper Gulf of California, Mexican fishermen set their nets to catch the Totoaba Bass. There are many issues within this fact. First, the nets are set in a protected area, making them illegal. Second, the Totoaba Bass is an endangered species that is fished for its swim bladder, that's smmugled to the US to be sold on the Chinese black market. Third, these nets catch not only their target, but also many other marine species like birds, sharks, crabs, turtles, rays, whales and dolphins that are discarded dead. Fourth, the Vaquita Marina, a native porpoise species to that area, is the most endangered marine mammal in the world because they're accidentally caught in these nets. There are less than 30 Vaquitas left in the world, and they're all in this region of the Sea of Cortez.
The Sea Shepherd Conservation Society is a marine conservation organization that establishes a strong presence in the area since 2015. Its volunteers use direct action tactics to protect the area and save the Totoaba and the Vaquita from extinction. They've managed to remove hundreds of nets from the water, and release almost a thousand live animals back to their habitat.