The importance of omega-3 fatty acids for the health of the ocean has been revealed by a new study. This research shows that 'ocean-fleas' play a vital role in maintaining a healthy ocean depend on omega-3's to survive. These 2 mm long creatures, called copepods, are distant relatives of crabs and lobsters and rank amongst the most abundant animals on our planet. They get omega-3's from eating microscopic plants in the sea that absorb carbon from the atmosphere. This carbon then gets transported into the deep sea by sinking copepod poo, stopping it returning to the atmosphere....