I trust the BBC more than any other news source. As far as reproduction, there are regulations that have been set for a reason, its not like they just regulate it to regulate it. The black market is really what kills it, coupled with environmental factors. I really cant see legal fishing being the problem, since the fishing industry is 1/3 of what it was 10 years ago and due to the decline of ocean life, laws, restrictions, odd weather patterns and illegal poaching, many cannot make a living on the sea.
Furthermore Ive seen 8 "seabass" ordered at a time for some tables. One fish is nothing to be ashamed about. Ordering 8 may be another story. I would not feel ashamed about buying one at all. If and when I do order it I normally split one with my date. Rarely do I even eat the fish, but it is delicious.
And even if 8 12 oz.chilean seabass were ordered at an American restraunt for 25$ a plate, that is nothing compared to the 32 or more being ordered at the same time on the black market for about 1$ per plate, since poachers are thought to take more than four times the amount of toothfish caught legally, and sell it for 30-35$ per kilogram.
My point is, its the environmental decline of the natural habitat of the fish and illegal fishing that really is endangering the Patagonian Toothfish. Its realy not legal fishing. End of story. And if all the "shallow water" fish die off, this would probably kill off the deep water fish, since there is a foodchain and all. So the assumption that because the fish lives in "deep water" it will be unaffected by a sudden drop in "more shallow dwelling" fish doesnt even make sense to me, bottom line is that humans are killing off just about every living thing. 99.9 percent of all life that has ever existed is now extinct, and that is a fact. So if you think that not ordering a Patagonian Toothfish at an American resteraunt is going to change something, you need a reality check.
If you really want to change the situation, or find the real "bad guy" instead of taking it out on me, what you should do is join the Australian Coast Guard unit that deals with poachers and try to take some of them down and ensure the breeding ground of the Patagonian Toothfish remains undisturbed from human intrusion. Leave honest law abiding citizens and establishments out of it.