Parrotfish to aid reef repair

A vividly coloured fish could be the key to saving the Caribbean's coral reefs from plummeting into terminal decline, scientists claim.

Their research forecasts that reefs risk being damaged beyond repair by the influx of seaweed.

But urgent action such as protecting parrotfish, which graze upon the floral invaders, may prevent the ecosystems from reaching this tipping point.

The research is published in the journal Nature.