Fascinating Hermit Crabs

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Night Diving and the Fascinating Hermit Crabs!

Known for its incredible marine biodiversity, it is therefore no surprise that the setting of the sun brings the most interesting creatures out to play in the Coral Triangle. One such ‘creature of the night’ that makes its home in Raja Ampat, Indonesia, is the intriguing hermit crab.

Hermit crabs, while not uncommon globally with over 800 known species, come in all different shapes and sizes. These unique crabs can be divided into two main groups, marine and terrestrial hermit crabs.

Fascinating Hermit Crabs
Fascinating Hermit Crabs 6

Marine hermit crabs are generally found in shallow reefs and shorelines, though on occasion are seen in deeper waters, and will spend most of their lives never leaving the water. These species are often observed hiding away in their “mobile homes” during the day, easily mistaken for shells or pieces of coral, thus staying safe and going unnoticed awaiting the fall of darkness. 

Most marine hermit crabs make use of mobile shells for protection and camouflage, though a very small number of marine hermit crab species use immobile structures such as coral growth or sponges. One common behaviour shared, is the hunt for a larger and more comfortable home.

As hermit crabs grow, they go through moulting periods (as many other crustaceans do) where they shed their exoskeleton to accommodate a growth spurt, before a new exoskeleton is formed. Hermit crabs differ with other crustaceans, as their exoskeletons are not strong enough to fully protect them from predatorial attacks. They have soft curved abdomens that leave them vulnerable when they’re not inside their reclaimed homes.

Fascinating Hermit Crabs
Fascinating Hermit Crabs 7

Marine hermit crabs are masters of disguise and opportunity. Many species have a symbiotic relationship with anemone. These crabs attach anemone to their shells and, in some cases, are even known to transfer the same anemone to a new shell when they relocate. These anemones provide protection to the crabs, who will often place the anemones on weak spots or openings in their shells.

Anemones have stinging tentacles that keep potential predators at bay. The anemones benefit from this relationship, by feeding from the scraps of the crabs’ meals and a free ride to other food sources. These crabs are even known to carry amphipods, or flatworms, on their shells to help with cleaning duties. The hermit crab shell is a home to many.

During the day these crabs are usually found hiding in plain sight, and only eager patient eyes will spot these masters of disguise. Divers have often mistaken a discarded shell or patch of coral to be empty, only to be surprised by legs and claws suddenly appearing. While it is not common for these crabs to be active during the day, they are scavengers and will not hesitate to capitalise on an easy meal. Hermit crabs are omnivores, and their habitat and size will directly influence their diet, which varies from plankton, other crabs and even dead fish or squid.

Fascinating Hermit Crabs
Fascinating Hermit Crabs 8

The reef systems of the Coral Triangle come to life when the sun goes down. Small areas of coral turn into a mass of movement, and action, for many species who hide in plain sight during the day, including the hermit crab.

During the night it is incredible to observe these fascinating creatures emerging from their hiding places in the coral or sponge gardens or moving their shells to a new hiding place among the similarly coloured and textured reef. Occasionally, if you are lucky, you might witness the relocation of a hermit crab to a new shell, though this requires tremendous luck. These interesting creatures are truly a highlight to observe on any night dive.  

Fascinating Hermit Crabs
Fascinating Hermit Crabs 9

While marine hermit crabs can spend their entire lives disguised in coral reefs, their terrestrial family members spend most of their time on firm ground. This is possible by their specialised gills, that only need to stay damp with either fresh or salt water to facilitate survival.

Therefore, the tropics are the ideal habitat for these crabs. The humid climate of areas such as Raja Ampat, provide the perfect habitat for terrestrial hermit crabs such as the Indos Crab. These terrestrial crabs are generally larger than their marine cousins. While marine hermit crabs use their claimed shells for protection and camouflage to survive, their terrestrial counterparts have more hardened exoskeletons and make use of their moving homes to store water in especially during migration seasons.

This water helps keep their gills damp on land. Where marine hermit crabs also make use of their shells for protection during the moulting process, terrestrial hermit crabs will burrow below ground until their exoskeleton has hardened enough.

Human expansion and pollution have led to the habitats of these crabs drastically shrinking and changing. It has now become common to see tin cans and other trash being used by the crabs as shells. The terrestrial crabs also have an omnivore diet but will always favour fish and other meat if available, but it is not uncommon to see these crabs snacking on tropical fruit that has fallen to the ground. These crabs are also mostly nocturnal and are known to have given many a fright, when they see a soup can slowly making its way down a tree or path.

Fascinating Hermit Crabs
Fascinating Hermit Crabs 10

Areas like the rich ecosystems of the Raja Ampat islands, allow travellers to see these fascinating creatures up close and personal, both above and below the water. Many of the popular dive sites in this area are near islands that are host to the terrestrial crabs, making it possible to see both hermit crabs on a single trip, to a picture-perfect tropical island in this breath-taking region.

About Organisation:

Situated in Raja Ampat, Indonesia, Meridian Adventure Dive is a PADI 5 Star Resort and winner of the PADI Green Star award. Scuba divers enjoy our professional services that have become synonymous with both the PADI and Meridian Adventure names.

@timpell49
#AskMark Mark great video love your content I recently had my cylinder hydro tested it was filled with air how long can you keep the air in the cylinder before you use it .Also dive shop can drain the air and fill with nitrox?
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@timpell49
#AskMark Mark great video love your content I recently had my cylinder hydro tested it was filled with air how long can you keep the air in the cylinder before you use it .Also dive shop can drain the air and fill with nitrox?
#scuba #scubadiving #scubadiver

Become a fan: https://www.scubadivermag.com/join

GEAR PURCHASES: https://www.scubadivermag.com/affiliate/dive-gear

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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS41ODI2RjhGOTVBODI2NDE5

How Long Can You Keep Air in a Cylinder? #AskMark #scubadiving

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00:00 Introduction
01:35 Scuba.com Ad
02:35 Duikvaker
03:15 EUDI
04:23 DRT
05:04 GO Diving Show UK
06:24 ADEX OZTek
07:06 Mediterranean
07:34 ADEX
08:21 TDEX
08:51 Scuba Show
09:36 MIDE
10:06 GO Diving ANZ
11:09 Diving Talks
11:58 DEMA

Full List of Dive Shows with Links:
https://divernet.com/scuba-diving/your-worldwide-dive-show-guide-for-2025/

JANUARY 18-26: Boot Düsseldorf (International Boat Show)
FEBRUARY 1-2: Duikvaker
FEBRUARY 21-23: European Dive Show (EUDI)
FEBRUARY 21-23: Diving Resort Travel (DRT) Show, Malaysia
MARCH 1-2: GO Diving Show (The UK Dive Show)
MARCH 15-16: ADEX Ocean Festival / OZTek Australia
MARCH 28-30: Mediterranean Diving Show
APRIL 4-6: Asia Dive Expo (ADEX)
MAY 22-25: Thailand Dive Expo (TDEX)
MAY 31 – JUNE 1: Scuba Show
JUNE 13-15: Malaysia International Dive Expo (MIDE)
SEPTEMBER 6-7: GO Diving ANZ Show
OCTOBER 17-19: Diving Talks
NOVEMBER 11-14: DEMA Show

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Website: https://www.divernet.com ➡️ Scuba News, Underwater Photography, Hints & Advice, Travel Reports
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We partner with https://www.scuba.com and https://www.mikesdivestore.com for all your gear essentials. Consider using the affiliate link above to support the channel.

The information in this video is not intended nor implied to be a substitute for professional SCUBA Training or recommendations for every manufacturer. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor or specific requirements from equipment manufacturers.
00:00 Introduction
01:35 Scuba.com Ad
02:35 Duikvaker
03:15 EUDI
04:23 DRT
05:04 GO Diving Show UK
06:24 ADEX OZTek
07:06 Mediterranean
07:34 ADEX
08:21 TDEX
08:51 Scuba Show
09:36 MIDE
10:06 GO Diving ANZ
11:09 Diving Talks
11:58 DEMA

YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS43OTNDNTk0OUNGMDA1MUNG

Upcoming Dive Shows in 2025 #scubadiving #diveshow

US diver Barrington Scott has set a verified Guinness World Record for the fastest time to scuba dive across all seven continents.Cartagena City Council says it is preparing to tighten access to the Cueva del Agua (Water Cave) system in southern Spain, following the death of a 37-year-old female diver there on 18 January. And an underwater habitat builder has just extended the record for longest time spent submerged. 

https://divernet.com/scuba-news/scuba-dash-across-7-continents-brings-world-record/
https://divernet.com/scuba-news/health-safety/spanish-cave-divers-death-prompts-calls-for-controls/ 
https://www.kentucky.com/news/nation-world/national/article299289964.html
https://divernet.com/scuba-news/pod-builder-completes-120-days-under-sea/

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Website: https://www.scubadivermag.com ➡️ Scuba Diving, Underwater Photography, Hints & Advice, Scuba Gear Reviews
Website: https://www.divernet.com ➡️ Scuba News, Underwater Photography, Hints & Advice, Travel Reports
Website: https://www.godivingshow.com ➡️ The Only Dive Show in the United Kingdom
Website: https://www.rorkmedia.com ➡️ For advertising within our brands
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We partner with https://www.scuba.com and https://www.mikesdivestore.com for all your gear essentials. Consider using the affiliate link above to support the channel.

The information in this video is not intended nor implied to be a substitute for professional SCUBA Training or recommendations for every manufacturer. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor or specific requirements from equipment manufacturers.

US diver Barrington Scott has set a verified Guinness World Record for the fastest time to scuba dive across all seven continents.Cartagena City Council says it is preparing to tighten access to the Cueva del Agua (Water Cave) system in southern Spain, following the death of a 37-year-old female diver there on 18 January. And an underwater habitat builder has just extended the record for longest time spent submerged.

https://divernet.com/scuba-news/scuba-dash-across-7-continents-brings-world-record/
https://divernet.com/scuba-news/health-safety/spanish-cave-divers-death-prompts-calls-for-controls/
https://www.kentucky.com/news/nation-world/national/article299289964.html
https://divernet.com/scuba-news/pod-builder-completes-120-days-under-sea/

#scuba #scubadiving #scubadiver

Become a fan: https://www.scubadivermag.com/join

GEAR PURCHASES: https://www.scubadivermag.com/affiliate/dive-gear

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OUR WEBSITES

Website: https://www.scubadivermag.com ➡️ Scuba Diving, Underwater Photography, Hints & Advice, Scuba Gear Reviews
Website: https://www.divernet.com ➡️ Scuba News, Underwater Photography, Hints & Advice, Travel Reports
Website: https://www.godivingshow.com ➡️ The Only Dive Show in the United Kingdom
Website: https://www.rorkmedia.com ➡️ For advertising within our brands
-----------------------------------------------------------------------------------
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FACEBOOK: https://www.facebook.com/scubadivermag
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We partner with https://www.scuba.com and https://www.mikesdivestore.com for all your gear essentials. Consider using the affiliate link above to support the channel.

The information in this video is not intended nor implied to be a substitute for professional SCUBA Training or recommendations for every manufacturer. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor or specific requirements from equipment manufacturers.

YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS4yNkZBOTQyMkYxQkQyMzc2

Spanish Cave Closed After Fatality #scuba #podcast #news

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