Giant Japanese Spider Crab (Macrocheira kaempferi) - Tennessee Aquarium - Chattanooga, Tennessee

-- Quick Japanese Spider Crab Facts --
‧ Habitat: Seabed at depths between 160 to 2000 feet deep, thrive at water temperatures of approximately 50 degrees
‧ Location: Pacific side of Japan and Taiwan
‧ Lifespan: Up to 100 years
‧ Size: Up to a 12.5 foot leg span
‧ Weight: Around 42 pounds
‧ Color: Orange and white bodies with long spiny legs
‧ Diet: Omnivore - plants, algae, mollusks, shrimp, small fish
‧ Predators: Large fish, stingrays, octopuses
‧ Top Speed: Unknown
‧ Conservation Status: Not evaluated

- Interesting Japanese Spider Crab Facts -
1. It has the largest leg-span out of all arthropods at up to 12 feet. They can have leg-spans wider than two full grown men. These long legs are covered in small spikes which are also known as tubercles.
2. Males are typically bigger and armed with larger claws. Males have larger claws, called chelipeds, to fend off predators and opposing crabs. Females tend to have wider and rounder bodies to house their eggs.
3. Japanese spider crabs are scavengers and do not hunt for prey. They prefer to scour the ocean floor for dead animals or plants.
4. In Japan, they are considered to be a culinary delicacy. The savoury meat contained in the long legs of Japanese spider crabs are enjoyed by many in Japan. During breeding season, fishing is prohibited so that an adequate number of crabs can be maintained in the ecosystem.
5. Japanese spider crabs like to dress up. This species belongs to a group of crabs termed “decorator crabs” which have been observed decorating their shells with sponges, plants, and anemones. This ornamentation allows them to camouflage and blend in with their environment, protecting them from predators and other threats.
6. Their legs can regenerate. Due to their length and spiny attachments, the legs of Japanese spider crabs may get torn off when caught in fishing nets or by predators. These limbs can regrow when the crab goes through a molting cycle.
7. They can lay up to 1.5 million eggs at a time! However, only a few survive to hatch. Those that do survive hatch approximately 10 days after and are approximately 0.03 inches in size.
8. They are gentle giants. Despite their intimidating and spiky appearance, these crabs are quite calm and slow in nature.
9. The Japanese name for this species of crab is ‘taka-ashi-gani’, which translates into “long-legged crab”.
10. It may have the longest lifespan among crabs. Commonly known crabs—such as Dungeness crabs, king crabs, and snow crabs—live for several decades (between 10 to 30 years). Japanese spider crabs have been proposed to possess the longest lifespan of any crab—surviving for up to 100 years.

-- Technical Information (or Nerdy Stuff) --
‧ Camera - Nikon D7200 (handheld)
‧ Lens – Nikkor 18-300mm Zoom
‧ ISO – 12800
‧ Aperture – f/4
‧ Exposure – 1/60 second
‧ Focal Length – 25mm

The original RAW file was processed with Adobe Camera Raw and final adjustments were made with Photoshop CS6.

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Taken in: United States / Tennessee / North Chattanooga (show map)

Taken on: September 7, 2023

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longest lifespan among crabs

largest leg-span out of all arthropods

tubercles

chelipeds

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decorator crabs

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たかあしがに

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Camera: Nikon D7200, f/4.0, 1/60 sec, 25mm (=37mm), ISO 12800 (more info) (hide info)

Camera:	Nikon D7200
Lens:	18.0-300.0 mm f/3.5-5.6
Aperture:	f/4.0
Exposure Time:	0.017 sec (1/60)
Focal Length:	25mm (35mm equivalent: 37mm)
ISO:	12800
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Aperture-priority AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Gain Control:	High gain up
Saturation:	High
Sharpness:	Hard
Color Space:	Uncalibrated
Software:	Adobe Photoshop CS6 (Windows)
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