Its ‘crown-of-thorns’ are the long sharp spines that cover its upper surface. What is more, the spines are coated with a saponin toxin, which causes
irritation to puncture wounds
(a considerable problem when working with the starfish).
How do crown-of-thorns starfish protect themselves?
The crown-of-thorns starfish is a sea star named for the spines that cover its body and arms. These spines are somewhat flexible in life and are
used for locomotion and for defense from potential predators
.
What does the crown-of-thorns starfish need to survive?
Feeding. Crown-of-thorns starfish usually eat the
polyps of hard, relatively fast-growing stony corals, such as staghorn corals
. If food is scarce, they will eat other coral species. They feed by extruding their stomach out of their bodies and onto the coral reef and then using enzymes to digest the coral polyps.
What happens if you touch a crown-of-thorns starfish?
They are bottom dwellers, so any contact with a diver is usually accidental.
Injury occurs from the spine and the venom in a gelatinous form from around the spine areas
. It can be injected into the skin and even through gloves as some star fish have long spines.
What do crown-of-thorns starfish do?
The crown-of-thorns starfish is a sea star named for the spines that cover its body and arms. These spines are somewhat flexible in life and are
used for locomotion and for defense from potential predators
.
What eats crown-of-thorns starfish?
Predators of adult crown-of-thorns starfish include
the giant triton snail
, the humphead Maori wrasse, starry pu erfish and titan trigger fish. Predators of juvenile starfish include shrimp, crabs and polychaete worms.
What is the largest starfish in the world?
| Sunflower sea star | Genus: Pycnopodia | Species: P. helianthoides | Binomial name | Pycnopodia helianthoides Brandt, 1835 |
|---|
What is the most poisonous starfish?
| Crown-of-thorns starfish | Family: Acanthasteridae | Genus: Acanthaster | Species: A. planci | Binomial name |
|---|
Can crown-of-thorns starfish populations be controlled?
Current efforts to control crown-of-thorns starfish include
complete removal from the reef or poisoning with substances
that kill the starfish but not other species on the reef (particularly corals).
Do starfish have predators?
Many different animals eat sea stars, including fish, sea turtles, snails, crabs, shrimp, otters, birds and even other sea stars. Though the sea star’s skin is hard and bumpy,
a predator can eat it whole if its mouth is large enough
. Predators with smaller mouths can flip the sea star over and eat the softer underside.
How much coral can a crown-of-thorns starfish eat?
Five million adult crown-of-thorns starfish can eat
about fifty square kilometres of
coral every year.
