Did you know?

Jellyfish are eaten by turtles!

Moon Jellyfish

Jellyfish are cup shaped animals with one opening and a rim of tentacles. Their clear body acts as camouflage helping moon jellyfish to survive in the open ocean. The body of a jellyfish is 95% water. They have no hearts, brains, bones or eyes and use their whole body to breathe through. Their simple structure has helped them exist for over 650 million years – that’s before sharks and life on land!

Jellyfish use their tentacles to catch prey of small fish, algae, and even other jellyfish. Tiny stinging cells in the tentacles, called nematocysts, paralyze the prey before it is drawn to the mouth and digested.

A group of jellyfish is called a smack! Smacks of 1000’s of moon jellyfish can be found all along Western Australia’s coastline and in the Swan River.

Moray Eel

Despite their snake-like appearance, moray eels are fish. All moray eels have one long fin that extends from the head to the tail and are covered with a slimy mucus that allows them to slither swiftly through the reef. Their long thin flexible bodies allow them to swim backwards and they’re known to twist their bodies into knots to crush prey!

To pump water over their gills moray eels constantly open and close their mouths’ – this behaviour makes them seam fearsome as it reveals the needle sharp teeth that hang from their mouth. Hidden in their throat is another set of jaws which, when feeding, extends up and grabs food to ensure it can’t escape.

Did you know?

Moray eels have 4 nostrils! They have an excellent sense of smell but poor eyesight.

Did you know?

Crayfish eat with their feet .

WACrayfish

Crayfish are ocean insects with segmented legs and a hard outer covering alike insects in your garden. When crayfish get too big for their hard outer shell, they break free and grow a new one!
Crayfish scan for predators and prey with kaleidoscope vision and can detect movement in the water with tiny bristles on their back. If under attack they scan dart backwards quickly into a cave, and rely on a body of armour including long spikey antennae that they beat like a club.

Each year adults form long orderly lines and march offshore to breed. Females can produce over 100,000 eggs and the young are carried back to shore by ocean currents.

The Cuttlefish

Cuttlefish are in the same group of animals as octopus and squid. They have 8 arms plus 2 feeding tentacles that are covered in tiny suckers and are used to distract and grab prey. As these are connect to their head they belong in the “cephalopod’ family, which means “head foot”.

Cuttlefish don’t have ears and can’t hear sounds. To “talk” they change the colour of their skin and can do so in less than a second! Their skin contains ‘ink’ sacs called chromatophores. Each sac is just a few millimeters big and has 15 muscles to control it.

Cuttlefish also change the texture of their skin, creating bumps and ridges to blend in with rocks, seaweed and coral. These features combine to make cuttlefish masters of disguise but they are also used to create light shows which mesmerise prey, attract mates and deter predators.

Did you know?

The first mass produced ink came from the cuttlefish.

32° 4' 57.2684'' S, 113° 10' 52.1484'' E

PERTH COAST

The stunning white sandy beaches of our metropolitan coast flow underwater into a shallow sandy seafloor dotted with seagrass beds, islands and reefs. Formed during the last ice-age these reefs have been worn by water and waves to create a marine matrix of caves, crevices and swim throughs.

The water itself pulses with the groups of jellyfish and bait balls of fish that make their ‘runs’ along the coast.