BBC - Life (4 of 10) Fish (2009)

Four years in the making, Life will set a new benchmark in family entertainment and natural history epics. Life is the latest wildlife epic from the BBC's award-winning Natural History Unit. It has the revelation, cinematic style, sense of place and emotionally involving individual sequences that that were the hallmark of The Blue Planet and Planet Earth, with all the scope, detail and content of an Attenborough epic, and the addition of close-up, intensely dramatic new behaviour all captured by the world's top wildlife photographers with the aid of the most cutting-edge and sophisticated filming techniques.
4. Fish. Fish dominate the planet's waters through their astonishing variety of shape and behaviour. The beautiful weedy sea dragon looks like a creature from a fairytale, and the male protects their eggs by carrying them on his tail for months. The sarcastic fringehead, meanwhile, appears to turn its head inside out when it fights. Slow-motion cameras show the flying fish gliding through the air like a flock of birds and capture the world's fastest swimmer, the sailfish, plucking sardines from a shoal at 70 mph. And the tiny Hawaiian goby undertakes one of nature's most daunting journeys, climbing a massive waterfall to find safe pools for breeding.