By Owen Gleiberman
Updated October 31, 2007 at 04:00 AM EDT

This beautiful and urgent eco-doc takes a bite out of the shark mythology made indelible by Jaws. Sharkwater argues that these ancient creatures are as friendly as dolphins, and relatively safe. But it also captures how poaching, which has escalated in the last 20 years due mostly to the popularity of shark-fin soup in Asia, has begun to decimate the earth’s shark population. The director, Rob Stewart, lands in the middle of his own corporate thriller when he’s arrested in Costa Rica after uncovering its illegal shark-fin industry. Stewart is a true filmmaker (and a great underwater lenser), and he taps your inner sea hippie. B+