i'll give more links later, if you want, but here is one: http://news.nationalgeographic.com/...

"The Marine Stewardship Council (MSC)—a London-based nonprofit that certifies fish from sustainable, monitored fisheries—has given its OK to Patagonian toothfish caught in one fishery."

And, note that "Catherine Elsworth" mentioned MSC regulations in her response that i posted above.