Our
location

Address: SEA LIFE Sydney Aquarium

1-5 Wheat Road, Darling Harbour

Sydney 2000

Get Directions
Contact Us

SINK YOUR TEETH

INTO OUR NEWSLETTER

I'd like to receive updates from Sydney Aquarium and other Merlin attractions.



News

Crown of Thorns

29 Aug 2012 10:15:44

Crown of Thorns

 

The Crown of Thorns Sea Star

 

Probably one of the most infamous of all sea stars, it is easy to tell how the crowns of thorns get their name. Covered in spikes, these are not an animal that would be pleasant to pat, as not only are the spines very sharp, they are also venomous.


Like all sea stars, if the crown of thorns loses an arm, it can quite easily grow it back. Coupled with the fact that they have a lot of arms already, these stars can be found with as many as 21 arms. To match their large number of arms, these sea stars can grow to be massive.

 

Usually seen around 50cm, some 'monsters' have been spotted at the huge size of 1m. This makes them one of the largest sea stars in the world.


Like all sea stars, to eat, the crown of thorns throws up their stomach out of their mouth, turning it inside-out and onto the food item to digest it. But it's not this surprising feeding method that makes the Crown of thorns so widely known, but rather what they like to eat. This sea star is unusual in that its natural diet consists of corals. If there are small numbers of sea stars the coral reef can survive and recover from the low levels of predation. However, if conditions are present that cause the sea stars numbers to dramatically increase, it can have devastating impacts of the coral reef.

 

There have been several "outbreaks" of crown of thorns on our Great Barrier Reef, prompting protective control methods to kill and remove the sea stars from the reef to give the coral time to recover. There is continued research and monitoring of the crown of thorns and causes of outbreaks to try to ensure the health of our reefs from this predator.


As well as being good at eating (which they do for about 50% of their time) the crown of thorns is also a very good runner. While you might not think it of a sea star, these critters can move very fast and thought to be able to cover over 20m in an hour.


So, come check out the thorny stars of our new Rocky Shores exhibit, there are two crowns currently on show!

 

View our Ticket Deals!

 

FLEXIBLE ADMISSION TICKET

No need to book a date or time
SLSA-Ticket-Images39.jpg

ONLINE ONLY

$44

PER ADULT (Child $31)
  • Flexible entry - arrive anytime in the next 12 months
  • Skip the queues with express online ticket entry
  • Free admission under age 4

VISIT 2 ATTRACTIONS

Book Online - Save over 40%
SLSA-Ticket-Images2.jpg

$88

Full Price

$50

Per Adult (Child $35)
  • Skip the queues with express mobile ticket entry
  • See it all in 1 day or visit over any 2 days
  • Valid for admission within 30 days