Viewing: Crustaceans

Apr 27

April 27, 2017

Shrimps, Seadragons and Siphonognathus argyrophanes

Shrimps, Seadragons and Siphonognathus argyrophanes (As told to Steve by David Muirhead) The fish Tubemouth, Siphonognathus argyrophanes, looks very pipefish-like, and many veteran divers incorrectly think that they are true pipefish. They are, however, in the same family as wrasses (Labridae), which includes the ‘rock cod’ or ‘parrotfish’, plus weed whiting and western blue groper (which strictly should be called a western blue groper wrasse because it’s completely unrelated to tropical groupers like the giant Queensland Grouper). Tubemouth, Siphonognathus argyrophanes…

Posted in Bony fishes, Citizen Science, Crustaceans, Syngnathids | By

Apr 9

April 9, 2017

The Purple Shore Crab, Leptograpsus variegatus

David Muirhead recently posted this crab photo on his Facebook page: – (Taken at Point Dutton (northwest of Coffin Bay) in March 2012) He wrote, “These large and gaudy crabs are favourites of mine. They only inhabit the intertidal zone (mainly northwest of about Coffin Bay in SA) and are beautiful to behold as they watch inquisitively from the safety of large jagged granite boulders and crevices with their carapace washed over by the gentle wind ripples and slight swells…

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Feb 11

February 11, 2016

Mysid Photos from Second Valley Dive

During our recent dive at Second Valley, David Muirhead took a couple of photos of what he thought were late larval planktonic phase southern rock lobsters. Below is a cropped version (by David) of one of his photos: – ?“Juv. Rock Lobster, ready to settle out of water column, Second Valley 6-2-16”? (with bullseye in background) He thought that they had swum inshore to get ready to settle on a rock reef (such as at Second Valley). He sent one…

Posted in Crustaceans, Marine invertebrates | By

Sep 24

September 24, 2014

The carbon footprint of dive tourism – are we loving our oceans to death?

It is with mixed feelings that I frequently see people I know raving about their next dose of international ecotourism, be it diving with whales in Tonga or on tropical reefs in any of our Pacific island neighbours’ waters. On the one hand, I respect my peers enthusiasm for diving, for exploring the natural world and for seeking out intimate experiences with the living ocean. On the other, I have grave concerns that the same people may not spare a thought for…

Posted in Climate change, Coral, Crustaceans, Molluscs, Pollution, Stormwater | By

Jul 26

July 26, 2014

The Southern Rock Lobsters at Margaret Brock Reef

The sanctuary zone at Margaret Brock Reef is the only place I’ve dived in SA where I’ve seen large numbers of huge rock lobsters (along with prolific juveniles and all between). Until then, I’d wrongly believed the (with hindsight, small to medium) lobsters (up to approx. 3-4 Kg with regard to the few we ate each Xmas!) that I and my various dive buddies were seeing everywhere else in SA were actually big, quite mature lobsters. We were in fact…

Posted in Crustaceans, Marine Protected Areas | By

Jul 22

July 22, 2014

Boxer Crabs use anemones as boxing gloves

Photo of a Boxer Crab (or Pom Pom Crab), Lybia edmondsoni by Dave Harasti In one of Brian Brock’s many letters to me in 2014, he wrote, “I am pretty sure that at some stage in my (chequered) career , I have seen a photo of a crab holding an anemone in each claw. (It ) Could have been seen in an aquarium rather than just a photo (e.g. Scripps, or NZ, or Sydney). Look as I might, I could not…

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