Marine life profile
Crab
Recorded at 3583 dive sitesWhere divers encounter it
Explore Crab around the world
Crabs are decapod crustaceans, either the Brachyura or various groups within the closely related Anomura, characterised by having a heavily armoured shell, their tail segments concealed under the body, the ability to run sideways, and the habit of hiding in rocky crevices. Most stay close to cover, emerging to feed, clean other animals or defend a small shelter.
Meet the species
What to look for
How to Recognize It
Look for a jointed shell, paired antennae and articulated legs adapted for walking, digging or gripping.
How It Behaves
Most stay close to cover, emerging to feed, clean other animals or defend a small shelter.
Special Ability
A tough external skeleton provides portable armor and is replaced as the animal grows.
Dive responsibly
Share the water well
How to Approach
Settle nearby and wait. Avoid touching antennae, claws or the shelter, especially during a night dive.
Safety
Observe without handling. Claws and defensive spines can injure, and recently molted animals are especially vulnerable.
Worth knowing
The detail you remember
Interesting Facts
They do not form a single natural group or clade, but have convergently evolved multiple times from the ancestral decapod body plan through carcinisation, the process of creating this set of characteristics.
Where to Find
Search beneath ledges, inside coral heads, around anemones and across rubble after sunset.
Known countries
Sightings map
Crab locations
Plan a dive
Dive sites with reported encounters
Dorfbach / Schulhaus
Switzerland
There is a lot of life going on at this diving site in a small space and at a small depth. A lot can be found underwater via hunting pike, overhanging underwater flora, backward-swimming crabs and hidden catfish. Parking is permitted on the gravel lot outside of class times for a fee. There is a toilet block in the immediate vicinity. A platform is located at a depth of approximately 5 m, ideal for training and exercises. You are not allowed to dive into the scions and you are not allowed to dive near the sprigs between April 15th and May 15th.
18th Palm
Bonaire, Sint Eustatius and Saba
House reef of Plaza Beach & Dive Resort and Toucan Diving!
Blairgowrie Pier
Australia
Blairgowrie Pier is a fantastic site for photographers, due to the abundant macro life. It's also a popular training site, due to its sheltered position and manageable depth range (2-7m). The pier pylons and sea wall are heavily encrusted with sponges - home to many Seahorses and Nudibranchs - even the odd Tasselled Anglerfish. Ledges and hidey holes make great homes for numerous species of Rays, as well as Octopus, Squid and Giant Cuttlefish. You can also see Stargazers, Flathead, Decorator Crabs, Goatfish and many others. Blairgowrie Pier often hosts the annual Giant Spider Crab march in May-June each year. Thousands of crabs gather in the shallow waters to moult.
Confetti Bay
Mauritius
A firm favourite in the North, a shallow dive site with a slight drop off to a max of 30 m. An ideal training site for PADI Open Water Divers, or a PADI Search and Recovery Specialty, Fish ID, Naturalist or PADI Advanced Open Water Course! So many schools of fish to swim with and enjoy stunning visibility and beautiful colour. Great for macro.
St. Didier Wreck
Turkey
St Didier has been sunked by an English aeroplane in 4th of July 1941 durin WW2. The ship whose real name was "Saint Didier", is lying right under the buoy which is an untired guard of the Antalya yatch harbour, 1 km away from there. With her bow looking to south and stern looking to the north, she is lying between 18 and 34 meters with an 35 degrees angle to the starport side. Her length is around 70 meters. In the studies done between 1946 and 1974 , they salvaged the skeletons and a lot of the ship's cargo. There is nothing much left as an artifact in the wreck becase of the later dives where everyone took some part of the wreck as a souvenier. But still she is getting the interest of the wreck divers.
Atlantic Princess
Dominican Republic
Get excited to experience something special. Atlantic Princess is a perfect wreck for both beginners and experienced divers. Full of marine life, this wreck provides lots of nooks and crannies for a great abundance of life from anemone as well as soft and hard coral, encrusting the boat, parrot fish, Sargent majors, lobster, many species of crab, barracuda, frog fish, lionfish (perfect for hunting on request) and that is just scratching the surface on what you can see here! Not only is it full of life, the wreck itself is something magnificent to see. There may be areas of this site, if not the entire site, that require additional training and experience beyond simply being a certified diver, for you to safely visit. This may include, but not be limited to, training and experience in deep diving, wreck diving, cavern/cave diving, or even technical diving. Always remember to dive within the limitations of your training and experience.
Back Door
Cambodia
The dive site Back Door is a massive reef stretching all the way from Mpai Bay village around the north-western side of Koh Rong Sanloem island. The reef is consisting of large boulders in the shallow part of the dive and a little cliff like overhang where lucky divers can often spot Cobias and schooling Baraccudas. Because if the size of the reef, one may do dozens of dives and always find new things to explore.
Bergse Diepsluis
Netherlands
Many believe the waters surrounding The Netherlands have more underwater life than the Mediterranean Sea. After diving in The Oosterschelde, you might believe it too. Bergse Diepsluis is less challenging than other dive sites in this area, but still rich with life. Situated in a tributary of The Oosterschelde, there is little to no tidal current, making it an ideal breeding ground for cuttlefish and squid. Colourful anemones, crustaceans and invertebrates are abundant year-round. Spring is the best time to see cuttlefish, but wait until the water temperature reaches 12°C/53°F. The maximum depth is 19 metres/62 feet. Average visibility is 4 metres/13 feet. Photo Credit: Daniel Versteeg
Casa Blanca
Mexico
This is a gorgeous reef named after Casa Gordon, a beachfront house which used to white. The reef very similar in composition and marine life to Paso del Cedral, with a constant drift which helps travel over the reef. A favorite of Cozumel's repeat divers, this dive site is often thriving with sharks, green morays and turtles.
Casino Point Dive Park
United States
One of the most popular dive sites in North America is well worth the acclaim. Featuring enchanting kelp forests, ever-changing marine life and convenient entry, the Casino Point Dive Park is a site you will want to visit again and again.
Christ of the Abyss
United States of America (USA)
Located at Key Largo Dry Rocks, this popular site features the famous nine-foot statue of Jesus donate by the Cressi family, popular dive-gear manufacturers. Sand channels in the coral feature moray eels, crabs, grouper and, if you're lucky, eagle rays!
El Natural
Puerto Rico
Beach Dive with both a shallow and a deep drop off to 40 m. Many types of sponges and invertabrae. Excellent DPV dive to deep wall using EANX30
Gabr el Bint
Egypt
Gabr el Bint ranks among one of the most attractive sites of North Sinai. With the access by boat, 4x4 or by camel, it is less frequently dived than the other dive sites in Dahab which has left this site in pristine condition. Gabr el Bint means 'The Grave of the Girl' in Arabic. There are two dives possible here. The ledge is riddled with exquisite coral heads that attract numerous reef species, including swarms of anthias, scorpionfish, parrotfish, crocodilefish, surgeonfish, triggerfish, trumpetfish, stingrays and very often a turtle. At the end of the ledge usually is home to a shoal of black and white snappers and twinspot snappers hang here between 5m and 10m. One of the truly breathtaking dives in Dahab.
Kandooma Thila
Maldives
Kandooma Thila, or also called Cocoa Thila, is one of the most exciting dives in South Male’ Atoll with great scenery as well as prolific fish life. The west and north side are the most spectacular, with the top at 16m. These are a focal point for schools of Bluefin Trevallies, eagle rays, dogtooth tunas and loose groups of gray reef sharks (50+ in the right current). Cleaning station for grey reef , you can see them going in a vertical position while small wrasses are cleaning them. Currents can be very strong making it a challenging dive. For experienced divers only.
Nemo Reef
India
Nice and clear water with an abundance of marine life as well as corals. It has a flat sandy bottom with a gradual slope starting right from the shore.
Pelican Rock
Mexico
Pelican Rock is one of Cabo's most famous sites. A pinnacle covered in purple fans rising up above the surface from around 14 meters underwater at its deepest. Just in front of the pinnacle we also have a beautiful wall dive filled with life, and off to its side one of Cabo's famous sand falls. The dive site has something for everyone. The shallows are great for courses & newer divers, while the deep walls make it an incredible spot for tec divers to explore. But the big highlight is the sheer amount of life that inhabits the site all year round, making it a beautiful spot for all levels of divers.
Prospect Wharf
Canada
Certification Level: All levels - easy site Overview Prospect Government Wharf is located in Prospect, Nova Scotia. It is ideal for trunk divers (people who don’t own boats), or just don’t feel like traveling too far, or are new to diving and want to get a nice easy dive under their belt. Please be mindful of the locals and parking is limited; best to car pool is possible. This site is often known for being fairly calm and easy entrance and exit, low tide can be a little more challenging. Around the wharf its mostly silt bottom, try to be careful not to stir up too much silt. Within a short swim the bottom composition starts to change to more solid (sand and small rocks). Around the wharf you may find a large collection of old bottles, shoes, toys, old clay pipes (can sometimes be found all around this site as it was a fairly busy fishing community in the hay day) and general garbage. There have been many attempts at clean up dives and site is improving. The average depth of this site is 15/4.75m to 25ft/7.62m depending on tide. Aquatic life consist of mostly crabs, flounder, lobster and sculpin. While there are few hazards to this site you should be aware of boat traffic at all times.
Rye Pier
Australia
Rye Pier is one of Melbourne's best know and most-loved shore dive sites and is a great day or night dive. It consists of an L-shaped pier roughly 500m in length, under which lives a whole lot of exciting marine life. Depth ranges from 2 - 6m. Growth has encrusted the pylons, so there's plenty to see. Rye Pier is the easiest place to see Seahorses in the world! Common sightings here include octopus (Sand, Blue Ringed, Maori and Keel, among others), cuttlefish, giant smoothrays, seahorses, leatherjackets, calamari, dumpling squid, goatfish, as well as Giant Spider Crabs in their thousands and large schools of salmon and pike in the right season.
Stonehenge
Thailand
Stonehenge is a superlative dive site and must be considered one of the top scuba spots in Thailand. Stonehenge is located only 5-10 minutes from Koh Lipe by boat and is full of Soft Leafy Coral making it a beautiful and vibrant reef. Generally you will see schools of Barracudas, Trevally & Yellow Snappers. Smaller creatures include Seahorses, Shrimps, Crabs, Nudibranchs, Seamoths, Stonefish & Frogfish. As this site is very exposed, strong currents can be expected, meaning diving here around Full or Black moon is not usually possible.
1 / 4 Wreck (Stern Courier)
Grenada
This site is the stern section of the Courier wreck in 11 meters / 35 ft of water, resting upside down with the Engine block and hull plates scattered around when it rolled from the top of the reef after falling off a transport barge.
1000 Rocks
Maldives
1000 Rocks is located within the marine nature reserve. The entry is north of the Faru. The sandy plateau falls from 5-15 meters and is sprinkled with lovely coral formations. From a depth of 18m onwards, there are large caverns beautifully decorated with many types of soft corals.
2MAI Diving Point
Romania
An interesting place for a simple and comforting dive when there are no waves. The area is known among the locals as “Plaja Mica.“
2nd Limanaki
Greece
This is the most famous dive spot for shore diving in Athens. Depths range from 2 to 39 meters, and is home to the famous “pigadi,“ a hole ranging from 7 -30 meters. Strong currents can occur at the bottom so be prepared.
40 Rows
Greece
This sheltered bay is the ideal dive site on days when the sea is not so calm. The deserted area is only accessible by boat, meaning there are always large amounts of fish look at, as well as a stunning view above water of the rocks against the magnificent blue sea.