Sharks, dolphins and gannets in sardine feeding frenzy

A remarkable video has emerged from South Africa of dolphins, sea birds and sharks competing to feed on migrating sardines.

The video shows dolphins blowing bubbles to herd the sardines together and then feed on the fish.

Meanwhile, gannets rain down from the sky at speeds of 100 kilometres per hour and dive under the water trying pick off sardines.

Sharks approach from all sides, themselves trying to make the most of the rapidly diminishing bait ball.

The astonishing clip was filmed on June 2 north of East London.