(CNN) The ocean once offered a comfortable life for the fishing community of Joal, in the Senegalese capital Dakar. “Ten years ago a fisherman could support a big family,” says Ahmed Diame, a Greenpeace ocean campaigner based in the region. “Now they cannot eat.”

Depleted fish stocks force the fishermen to travel further out to sea in search of a worthwhile catch, says Diame, which can be dangerous. Others quit and leave Joal to find work abroad, often via migration routes that are even more dangerous.