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Diving with British Marine Life: the European Spider Crab

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If you’ve dived in the UK chances are you’ve encountered a European spider crab (Maja brachydactyla). While often overlooked, these crabs display a wide range of behaviours making them brilliant photography subjects and great characters to observe on a dive.

M. brachydactyla is found on the South and West Coast of England and Ireland and is the largest spider crab in the UK. European spider crabs are characterised by their red-yellow body colouration and triangular carapace bearing two distinct frontal spines between the eyes. The claws are relatively narrow with white tips, while their walking legs have dark tips.

Their carapace is covered in tiny barbs, which they use to fix an array of algae in order to ‘decorate’ a fresh moult. Such behaviour is well documented in majid crabs and helps to camouflage their bright exoskeletons. Paul Naylor, marine biologist, photographer and author of Great British Marine Animals, showcases this decorative behaviour on his Vimeo profile.

As well as actively masking their exoskeleton, spider crabs play host to a wide range of epibionts. Sessile organisms such as barnacles, anemones and tunicates settle onto their carapace in their larval stage. This relationship is known as mutualistic; the host benefits from protection from predators via camouflage, and the epibionts (an organism that lives on the surface of another organism) are exposed to sediment resuspended by the host, protection from slow moving predators, and better dispersion of offspring.

Documentary worthy aggregations of spider crabs also occur close to shore around the UK; but surprisingly these dense aggregations, also known as mounds, are driven by moulting rather than breeding. I am yet to witness this phenomenon, but look forward to the day I do!


Hear more from Georgie here: https://georgiebullphotography.home.blog/

Georgie is a Marine Biology and Coastal Ecology student at Plymouth University and an active diver in the South West of England. This year she will be completing the HSE Scuba qualification with the University in the hope that scuba will become part of her future career. She is particularly interested in native species and has a soft spot for elasmobranchs and molluscs.

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PADI meets with Maldivian Ministry to confirm protection of sharks

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Over recent weeks, there has been speculation about the possibility of the Maldivian government lifting the ban on shark fishing in the country’s waters. PADI®, and the dive industry at large, were instrumental in establishing these protections over a decade ago.

With concern for the continued protection of sharks in the Maldives, the PADI organisation and Project AWARE®, along with 200 concerned local and international stakeholders opposing the lifting of the shark fishing ban, called on the government to continue to enforce the legal protections of sharks. PADI staff met with Maldivian Ministry of Fisheries, Marine Resources, and Agriculture Zaha Waheed to reinforce the position of the dive community and critical role sharks play in dive tourism.

In those meetings, Minister Waheed assured PADI that the Ministry of Fisheries, Marine Resources, and Agriculture has no intentions to lift the ban on shark fishing. She affirmed that they remain committed to sustainable and responsible management of fisheries and marine resources in the Maldives. On 20 April 2021, the Ministry of Fisheries, Marine Resources, and Agriculture released a statement asserting that “the Maldives does not intend to permit a targeted shark fishery in the Maldives.”

“Sharks are a dominant force in dive tourism in the Maldives. We congratulate the Maldives’s commitment to their ongoing protection,” says Drew Richardson, President and CEO of PADI Worldwide. “The Maldives continues to lead by example, among the most progressive countries on this critical issue.”

There are currently 17 shark sanctuaries in the world; the first established in Palau in 2009 and others in popular dive destinations including French Polynesia, Honduras, The Bahamas and several others in the Caribbean. The Maldives shark sanctuary was established in 2010 and covers 916,000 km2 (353,000 square miles).

Tourism accounts for an estimated 25 percent of Maldives’ GDP (according to 2014 figures), with diving and snorkeling being the most popular tourism activity. Prior to the formation of the Maldivian sanctuary, shark fishing was worth US$0.7 million to the Maldives’ economy, compared to US$2.3 million from shark tourism. In 2018, the shark sanctuary increased dive-trip demand in the Maldives by 15 percent, raising an additional US$6 million. Consumer research indicates that any re-opening of a Maldives shark fishery could potentially decrease dive tourism demand by over 50 percent, which could result in a loss of US$24 million.

Sharks are some of the most endangered species in the ocean, with recent research showing that the global number of oceanic sharks has declined by 71 percent. Over a third of shark and ray species are threatened, facing an increased threat of extinction, primarily due to overfishing.  There are an estimated 600,000 shark watchers globally spending $314 million per year and directly supporting 10,000 jobs. Research indicates these figures are expected to rise as global tourism returns to pre-pandemic levels.

As part of its commitment to ocean conservation, PADI will continue to stand up for sharks and advocate for their protection. For more information on responsible shark tourism, read Project AWARE’s Guide to Best Practices. To learn more about PADI’s efforts and how you can join the community of PADI Torchbearers working to save the ocean, visit padi.com/conservation.

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Miscellaneous Blogs

The BiG Scuba Podcast… with Rosemary Lunn

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Ian and Gemma chat among themselves and are also are joined by well-known Dive Industry Professional Rosemary Lunn.

We talk about dive fitness and entering the CrossFit 2021 open games and being members of our local CrossFit Box. You can also listen to our new member of the team – Rosemary Lunn – answer some scuba diving questions.

Find out more about Rosemary at www.tumc.co.uk.


Find more podcast episodes and information at the new www.thebigscuba.com  website and on most social platforms @thebigscuba 

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Explore the amazing triangle of Red Sea Reefs - The Brothers, Daedalus and Elphinstone on board the brand new liveaboard Big Blue.  With an option to add on a week at Roots Red Sea before or after. 

Strong currents and deep blue water are the catalysts that bring the pelagic species flocking to these reefs. The reefs themselves provide exquisite homes for a multitude of marine life.  The wafting soft corals are adorned with thousands of colourful fish. The gorgonian fans and hard corals provide magnificent back drops, all being patrolled by the reef’s predatory species.

£1475 per person based on double occupancy.  Soft all inclusive board basis, buffet meals with snacks, tea and coffee always available.  Add a week on at Roots Red Sea Resort before or after the liveaboard for just £725pp.  Flights and transfers are included.  See our brochure linked above for the full itinerary.

This trip will be hosted by The Scuba Place.  Come Dive with Us!

Call 020 3515 9955 or email john@thescubaplace.co.uk

www.thescubaplace.co.uk

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