Solution is simply vinegar

The Great Barrier Reef. Photo / NZ Herald

It's drizzled on fish and chips and used for cleaning, but simple household vinegar could soon be called on for its most important mission yet: saving the Great Barrier Reef.

Researchers at Queensland's James Cook University have described in a new paper the effectiveness of vinegar in killing crown-of-thorns starfish.

Outbreaks of the venomous, coral-eating animals are considered one of the most significant threats posed to the Great Barrier Reef.

The paper's lead author Lisa Bostrom-Einarsson said vinegar had been used to try to kill the starfish before, but JCU scientists had refined the process, resulting in a 100 per cent kill rate.

Bostrom-Einarsson said divers currently used 10ml-12ml of ox bile to kill each individual crown-of-thorns starfish.

"It's expensive, requires permits and has to be mixed to the right concentration," she said.

"We used 20ml of vinegar, which is half the price and can be bought off the shelf at any local supermarket."

Bostrom-Einarsson said in the JCU lab trials, all specimens were dead within 48 hours of being injected.

She said the next step, to begin by the end of the year, would be large-scale field trials to ensure the process was safe for other marine life.

"There's no reason to think it won't work or it'll be dangerous, but we have to be sure," she said.

She said divers managed to kill about 350,000 on the Great Barrier Reef last year with two full-time boat crews, but there were estimated to be about four to 12 million starfish on the reef, with each female able to produce about 65 million eggs in a single breeding season.

- AAP