CATDOLL : CATDOLL: What kind of crab is this with three brown spots on its back?

1. What kind of crab is this with three brown spots on its back?

You mean the swimming crab? Also called the three-spotted swimming crab. Very good food~~

2. How do crabs reproduce?

How do crabs reproduce? They rely on the mother crab to give birth to baby crabs. Each time, the mother crab will lay a lot of eggs, up to millions of eggs. After these eggs hatch in the mother crab's abdomen, the larvae can separate from the mother and float around with the coastal tide. After several molts, they grow into big-eyed larvae. The big-eyed larvae molt several more times and grow into juvenile crabs. The juvenile crabs look almost the same as adult crabs. After several more molts, they become crabs. Most marine crabs release their eggs directly into the ocean after they mature without hatching.

River crabs grow in fresh water and reproduce in seawater. After entering fresh water, crab fry usually live in river bays and lakes with abundant bait for about 18 months, and their gonads gradually mature. Mature river crabs begin to lay eggs in the coastal areas where freshwater and seawater mix in late autumn and early winter. This is reproductive migration. Female crabs can lay eggs soon after mating. The eggs are attached to the female's abdominal limb hairs in strings and piled up in the abdomen until the larvae hatch. This type of crab is called "egg-carrying crab". River crabs can lay tens of thousands to millions of eggs at a time, and can lay eggs 2-3 times. In nature, it takes 4 months for fertilized eggs to hatch, and the hatching rate can reach about 90%. The newly hatched larvae are very small and shaped like water fleas, called zoea. After five molts, the zoea grow into crab fry (megalopa) in about 35 days. The crab fry molts again and becomes a young crab. The crab that has just shed its shell is called a soft-shell crab. It is unable to eat or defend itself. The shell will harden after 1-2 days, and the crab will gradually become active. After shed, the crab body will increase significantly. After the river crab reproduces, its body will quickly age and die.

Breeding habits of swimming crabs (representative of marine crabs)

The swimming crab is dioecious. The average lifespan is 2 years, and rarely exceeds 3 years. Its biological minimum size is 5.1 cm long carapace, the largest male individual is 11 cm long carapace, 22 cm wide, and weighs 710 grams; the largest female individual is 10.5 cm long carapace, 22 cm wide, and weighs 730 grams. The spawning and breeding group is mainly composed of 1-2 year old parent crabs. Females die after laying eggs and hatching. Males may die after mating for 2-3 days. The mating time of the wintering swimming crabs is between July and August each year, while the mating peak of the swimming crabs born in the same year is between September and October.

3. What are the white threads in the sea crab?

If one end is fixed, it is the crab's gills, which cannot be eaten. If the "thread-like" part is not fixed and not every crab has it, it is best not to eat it.

4. What are the white granular objects inside the drowned crab after opening it? How are they formed?

Considering the eggs, I have eaten a lot and never seen it before.

5. How to make stewed flying crab with cabbage and frozen tofu?

Ingredients: 1 flying crab (also known as swimming crab, also known as sea crab) (about 300 grams), 200 grams of Chinese cabbage, 200 grams of frozen tofu, and 50 grams of fine vermicelli (dried).

Seasoning: 5 grams each of onion and ginger, 750 grams of chicken soup, 3 grams each of salt, MSG, pepper and sugar, 5 grams of Shaoxing wine, 2 grams of vinegar, and 10 grams of salad oil.

Method: 1. Open the shell of the flying crab, wash and clean it, and chop it into 10 even-sized pieces. 2. Pick the leaves of the Chinese cabbage, wash it, cut the stems into razor blades, and cut the leaves into slices. 3. Thaw the frozen tofu with cold water, squeeze out the water, and cut it into rectangular thick slices of 5 cm long, 3 cm wide, and 2 cm thick. 4. Soak the thin vermicelli in 60℃ warm water for 30 minutes until it softens, and cut it in half with scissors for later use. 5. Wash the green onion and cut it into 2 cm segments, peel the ginger and cut it into slices. 6. Heat the pot on the fire, add salad oil, and when it is 70% hot, add the green onion and ginger slices and stir-fry until fragrant, then add Shaoxing wine and vinegar, add the cabbage slices and stir-fry for 2 minutes, add chicken soup, add refined salt, MSG, pepper, and sugar, boil over low heat, then add the crab pieces, crab shells, frozen tofu, Chinese cabbage, and thin vermicelli, simmer over low heat for 45 minutes until cooked and tasty, and serve. Features: The soup is milky white, fresh and tasty. This dish is an innovation based on traditional dishes, stewing seafood with Chinese cabbage and frozen tofu, giving full play to the characteristics of each ingredient.

The answer comes from the official website of China Food Network

6. What are the animals that walk sideways?

There are many kinds of crabs, with various shapes and forms. For example: sand crabs, fiddler crabs, round-toed crabs, blue crabs, scissor crabs, spider crabs, Guan Gong crabs, Dungeness crabs, emperor crabs, snow crabs, giant crabs, Japanese chestnut crabs, steamed crabs, bean crabs, hairy crabs, mud crabs, three-tuberculate swimming crabs, Chinese mitten crabs, long-armed crabs, etc. Crabs are the general name for the Brachyura order of the Decapoda order. There are about 4,700 species in the world, and about 800 species in China (too many, it is difficult to find them all)

It seems that all crabs walk sideways, except for monk crabs (actually crabs can also walk straight, but not fast enough). There may be some other crabs that walk straight.

Their hard shells protect them, and their flat bodies allow them to hide in narrow gaps. However, this creates an obstacle for the crab's "shoulder joint", preventing it from moving forward and backward in a large range. Although the "elbow" can move freely, there is no ball and socket joint at the "elbow", which means they have to walk sideways most of the time.