Please select your home edition
Edition
Naiad/Oracle Supplier

Killer solution for the Crown of Thorns starfish

by ARC Centre of Excellence for Coral Reef Studies on 9 Oct 2012
Close up image of the Crown of Thorns Starfish. ARC Centre of Excellence Coral Reef Studies © http://www.coralcoe.org.au/
An Australia-based team of marine scientists has established what may prove an effective control for the dreaded Crown of Thorns starfish (COTS), which intermittently ravages coral reefs across the Pacific and Indian Oceans.

With signs that the starfish is building up for another huge attack in the Pacific and Australian region, their solution could come in the nick of time.

The researchers, from the ARC Centre of Excellence for Coral Reef Studies (CoECRS) at James Cook University (JCU) have discovered that a harmless protein mixture used to grow bacteria in the laboratory can destroy the starfish in as little as 24 hours.

If subsequent tests show it is safe for other sea life, their breakthrough could yield a dramatic improvement in ability to control of COTS outbreaks, even if only to protect sites that are intensively used for tourism.

'A Crown of Thorns outbreak can destroy from 40-90 per cent of the corals on a reef. Over the past 50 years it has caused more damage than bleaching,' says Dr Jairo Rivera Posada 'There were massive outbreaks in many countries in the 1960s and 1980s – and a new one is well underway on the Great Barrier Reef.'

Dr. Posada, who trained as a vet before switching to marine research, was on the beach with Professor Morgan Pratchett of CoECRS at Lizard Island in the Northern Great Barrier Reef when he wondered if the substance he was using in the lab to selectively culture the Vibrio bacteria that naturally inhabit the starfish could give the bugs enough of a boost to damage their host.

Rushing back to their tanks, they quickly injected five starfish with the media culture solution – made from carbonates and proteins extracted from animal tissues – and were astonished when the starfish rapidly began to fall apart and die as the bacteria attacked them.

'I was only hoping to impair their immune systems – so the fact that they died so quickly was a great surprise,' Jairo says.

Looking more closely, the researchers found that the solution had caused the bacteria to bloom and attack the starfish; at the same time the starfish suffered an acute allergic reaction to the unfamiliar animal proteins (mainly derived from cattle). Furthermore, the bacteria also spread under favourable conditions to other starfish which came in contact or close to the infected individual.


This ‘double whammy effect caused by an otherwise harmless protein mixture has opened up the possibility of developing a safe, convenient and fast way of killing Crown of Thorns starfishes, explains Professor Morgan Pratchett of CoECRS and JCU.

'In developing a biological control you have to be very careful to target only the species you are aiming at, and be certain that it can cause no harm to other species or to the wider environment. This compound looks very promising from that standpoint – though there is a lot of tank testing still to do before we would ever consider trialling it in the sea.'

Prof. Pratchett says starfish outbreaks in the vicinity of specific tourist sites are currently controlled using a poison injection delivered by a diver – but we need to find more effective and efficient control methods if we are to scale-up control programs.

Dr. Rivera adds that the protein solution needs only a single jab into a starfish, enabling a diver to kill as many as 500 Crown of Thorns in a single dive – compared with 40 or so using the poison injection. Nevertheless, stopping an established outbreak of millions of starfish will not be feasible. It is already too late to stop the current outbreak, they say.

'In the current COTS outbreak in the Philippines they removed as many as 87,000 starfish from a single beach. This gives you an idea of the numbers we have to deal with,' he adds. Other fresh COTS outbreaks have been reported from Guam, French Polynesia, Papua New Guinea, and the central Indian Ocean.

The team is about to embark on extensive testing to establish the technique is safe for use around corals, fish, other types of starfish, sea urchins and sea cucumbers.

They are also exploring other natural parasites and disease-causing organisms for controlling Crown of Thorns, as well as simple protein injections which trigger a fatal allergic reaction. However, any attempts to control these outbreaks will be futile without also addressing the root cause of outbreaks, including loss of starfish predators as well as increased nutrients that provide food for larval ARC Centre of Excellence for Coral Reef Studies website

Kiwi Yachting - Lewmar 660 - 1InSunSport - NZLancer Not Equal

Related Articles

Reef sharks take small bites
Coral reef sharks eat prey that are smaller than a cheeseburger Sharks have a reputation for having voracious appetites, but a new study shows that most coral reef sharks eat prey that are smaller than a cheeseburger
Posted on 20 Mar
Suburbs to Sea - Stopping litter at the source
Over sixty people gathered at Point Cook Community Centre for a special ‘Movies and Muffins’ night to learn about litter Over sixty people gathered at Point Cook Community Centre recently for a special ‘Movies and Muffins’ night to learn about litter and its impact on the environment as part of Wyndham City’s Green Living Series.
Posted on 18 Mar
Good radio communication tips - Video
Good communications could make all the difference in an emergency at sea. Here's some great basic communication tips Good communications could make all the difference in an emergency at sea. Here's some great basic communication tips from Scott Walker and Mal Williams from Outdoors Group.
Posted on 10 Mar
We can fix the Great Barrier Reef
Leading coral reef scientists say Australia could restore Great Barrier Reef to its former glory through better policies Leading coral reef scientists say Australia could restore the Great Barrier Reef to its former glory through better policies that focus on science, protection and conservation.
Posted on 20 Feb
Great Barrier Reef marine reserves combat coral disease
A new and significant role for marine reserves on the Great Barrier Reef has been revealed A new and significant role for marine reserves on the Great Barrier Reef has been revealed, with researchers finding the reserves reduce the prevalence of coral diseases.
Posted on 20 Feb
Powerboat noise gives marine predators a deadly advantage
A pioneering new study shows the rate fish are captured by predators can double when boats are motoring nearby. A pioneering new study shows the rate fish are captured by predators can double when boats are motoring nearby.
Posted on 8 Feb
More recreational boaties wearing lifejackets
In good news for boating safety, more recreational boaties are wearing lifejackets the entire time they are on the water In good news for boating safety, more recreational boaties are wearing lifejackets the entire time they are on the water. Maritime New Zealand has released new research into recreational boating behaviour that shows in 2015 78 per cent of recreational boaties reported wearing a lifejacket the entire time they were on the water. This is up from 67 per cent in 2014, and 62 per cent in 2013.
Posted on 13 Jan
Eco-warriors Sea-Bin crowd sharing critical stage with nine days to go
The automated marina cleaning SeaBin project has raised 86% of their target with 9 days left. The automated marina cleaning SeaBin project has raised $198,020 of $230,000.00 with nine days left on their Indiegogo crowdfunding platform, but they need more help now.
Posted on 29 Dec 2015
Wellington boatie placed under 'house-arrest'
A boatie who had bought a “tired” yacht for just $500 online has had the vessel restricted to use on Wellington harbour A boatie who had bought a “tired” yacht for just $500 online has had the vessel restricted to use on Wellington harbour after threatening to sail to Westport without an engine, radio or safety equipment. Another online shopper did the right thing in buying an emergency beacon (EPIRB - emergency position-indicating radio beacon) before heading out in his boat.
Posted on 22 Dec 2015
New guidelines published for the servicing of inflatable lifejackets
Some inflatable lifejackets failed because they had not been serviced, and boaties were getting unclear information Concerns that some inflatable lifejackets failed because they had not been serviced, and boaties were getting unclear information, have led to new, national guidelines for safer use of inflatable lifejackets. The guidelines were developed by a nation-wide industry group representing manufacturers, importers, retailers, boating organisations and others
Posted on 14 Dec 2015