Small fish swim at phenomenal speed and form a daunting bait ball in a desperate attempt to ward off hungry predators. Taken From: Blue Planet Series 1 Subscribe to the BBC Earth YouTube channel: www.youtube.com/subscription_center?add_user=BBCEarth BBC Earth YouTube Channel: www.youtube.com/BBCEarth BBC Earth Facebook www.facebook.com/bbcearth BBC Earth Twitter www.twitter.com/bbcearth BBC Earth Instagram www.instagram.com/bbcearth/?hl=en Visit www.bbc.com/earth/world for all the latest animal news and wildlife videos This is a channel from BBC Worldwide who help fund new BBC programmes.