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Home»News»Soft crabs find strength in numbers
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Soft crabs find strength in numbers

Bayside NewsBy Bayside News20 June 2016Updated:4 July 2016No Comments2 Mins Read
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Sheree Maris takes an underwater selfie with a giant spider crab backdrop.
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Sheree Maris takes an underwater selfie with a giant spider crab backdrop.
Sheree Maris takes an underwater selfie with a giant spider crab backdrop.

Words and pictures: Sheree Marris, aquatic scientist and raconteur

crabs3FORGET the epic aggregations of wildebeest you’ve seen on documentaries, the Mornington Peninsula has something far more spectacular on its front doorstep.

To see it, you’ll need to ditch the binoculars and grab a mask, snorkel and wetsuit because it’s in the waters of Port Phillip.

crabs4Around this time every year as the waters cool, hundreds of thousands of giant spider crabs make their way up onto the sandy shallows along the southern shores of the bay. As the name suggests these crabs are impressive in size, with a body measuring over 17cm and long legs that stretch up to 70cm.

The result is an orange army of crabs that blanket the shallows, which can stretch for hundreds of metres and crabs can be 10 deep. Scientists believe this aggregation is a case of safety in numbers.

Like their crustacean relatives, giant spider crabs need to shed their hard protective shell to grow.

During this time their body is soft and they are vulnerable to the mouths of hungry hunters such as rays, seals and even birds.

Getting together in such huge numbers to moult reduces the chance of being eaten.

Surprisingly, there has been little research conducted on this natural phenomenon, although an active community of citizen scientists are doing a great job of documenting their movements.

It’s a sight that needs to be seen to be believed. The bonus is, anyone can. Where? Around the southern end of Port Phillip. The crabs are still on the move and you can keep updated on the Spider Crabs Melbourne Facebook page, which has regular reports of their whereabouts and the best time to safely see them.

Although they’re harmless, it is not recommended to pick up the crabs.

First published in the Frankston Times – 20 June 2016

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Established in 2006, Mornington Peninsula News Group (MPNG) is a locally owned and operated, independent media company.

MPNG publishes five weekly community newspapers: the Western Port News, Mornington News, Southern Peninsula News, Frankston Times and Chelsea Mordialloc Mentone News.

MPNG also publishes two glossy magazines: Peninsula Essence and Peninsula Kids.

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