Stewart's documentary is seldom less than compelling in its quest to raise international awareness about a situation that is threatening to put sharks on the endangered list.

With its stunning photography this would be a righteous and magnificent documentary were it not for the on-camera presence of film-maker Rob Stewart, marine biology's answer to Tom Cruise.

Stewart's point is that the shark fin industry, in its short-sighted quest for financial gain, may trigger an ecological disaster beyond the extinction of the sharks themselves. This is depressing, but important, stuff.

It's hard not to admire a man with such admiration for the obscure, but Grizzly Man did it much better.