http://jblaque.livejournal.com/292407.htmlRead that and make a donation to the group if you can.
It's on the commercial harvesting of the sea, which as far as I can tell, seems to be killing a lot more than just tuna chunks.
The disturbing thing is that after reading this, it looks like a single, particularly brutal but isolated incident, but it's more often than not the norm.
Anyway, read it and do what you can.