The largest crab in the world is the giant crab. The giant crab is the largest existing crustacean and the only species of the genus Giant Crab in the family Arachnidae of the order Decapoda. It is mainly distributed in parts of the Pacific Ocean and lives in the seabed silt terrain in the Pacific Ocean from Iwate Prefecture, Japan to the northeastern corner of Taiwan, with a depth of 500-1000 meters and an average temperature of ten to fifteen degrees Celsius. It has a dark orange body with ten long limbs with white spots on them. The first two limbs develop into chelae. The largest specimen has a leg length of 4.2 meters when unfolded, a body length of 38 centimeters, a weight of 20 kilograms, and a lifespan of 100 years. The two compound eyes grow in front of the body, with two spines between them.

Life habits of Giant Crabs

1. Giant Crabs like to move in deep sea waters with a water temperature of about 10 degrees Celsius. They will only float to the shore during the breeding season. In shallow water areas, they make a living by preying on fish.

2. Giant crabs have huge bodies and agile movements, and can quickly catch small fish and shrimps. When choosing an attack target, this crab will lurk silently on the seabed, using its two periscope-like eyes and the vibration sensors in its body to identify objects around it.

3. When the giant crab finds food nearby, it will move quickly. With its 8 sharp claws, it will grab the struggling prey hard, and then use its two large and hard claws to The pincers tighten the prey until the prey is bruised and dead from exhaustion, and then eats the prey.

The reproduction method of giant crabs

Giant crabs usually live in the deep sea and only come to shallow seas to breed in spring. They are oviparous animals. These giant crabs mate in early spring, from January to March. There are few mating records of this crab. The male crab keeps the sperm in the sperm pod, which is inserted into the female's abdomen between the two claws before use. The adolescent growth stage is well documented in the laboratory, but information on studies in natural habitats is rather sparse. A male often lays 1.5 million eggs per breeding season. The survival rate is not high, and only a small number can survive. The egg diameter is between 0.63-0.85 mm. The incubation time is about 10 days. The breeding time is about one year, but due to various restrictions, humans currently do not understand its exact growth time.