"As often as Herman had witnessed the slaughter of animals and fish, he always had the same thought: in their behaviour toward creatures, all men were Nazis.
The smugness with which man could do with other species as he pleased exemplified the most extreme racist theories, the principle that might is right"
My beloved enemy
from Isaac Bashevis Singer
Tunas and dolphines, we know about, but ignored from most of us. But man killing mating dolphines.. have you seen the documentary/ecothriller 'The Cove'? Here a review by Kenneth Turan, Los Angeles Times Film Critic
Interested for more; see the movie Earthlings here or why not see the broader picture with trade with both animals, crops and water in the move "We feed the world".