CATDOLL : CATDOLL: What are the differences between the three types of sea crabs: red crab, flower crab and flying crab?

1. What are the differences between the three types of sea crabs: red-shelled crab, flower crab and flying crab?

Flower crab is a type of red crab, so I won't elaborate on it. We only distinguish between red crab and flying crab. We can distinguish between red crab and flying crab based on their appearance, habits, and geographical distribution.

1. Appearance:

The red-shelled sea crab is a type of sea crab. There are three types of this crab: the first type is the green-shelled crab, the second type is the purple-shelled crab, and the third type is the flowery-shelled crab. Because its abdomen and leg edges are slightly red, it is called red-shelled crab or stone-shelled crab.

The scientific name of the flying crab is the three-tuberculate swimming crab, which is named because of its spindle-shaped head and chest carapace and the three prominent tubercles on the back of the stomach and heart area. Moreover, this crab is good at swimming, and the last pair of legs have evolved into webbed feet.

2. Living habits:

The red crab has a ferocious temperament, its fifth pair of flag-shaped limbs are flat, it is not good at swimming, and it often lives in shallow waters. It is also good at climbing on reefs to find food.

Flying crabs are used to hiding in the seabed during the day and coming out to look for food at night. They have a clear tendency to move towards light. When diving into the mud and sand, they often form an angle of 15 to 45 degrees with the bottom of the pool, with only their eyes and tentacles exposed. They are good at swimming and mostly live in waters of 10m-50m.

3. Geographical distribution:

Red-shelled crabs are produced along the coast of my country. There are many reefs along the coast of Rushan, dense seaweed and abundant bait. It is the main reproductive area of ​​red-shelled crabs. The red-shelled crabs here have dense meat and are larger in size than those in other areas.

Flying crabs are mostly distributed in Japan, Korea, the Malay Archipelago, the Red Sea, and coastal areas of my country. It can be said that they can be seen in coastal areas.

Additional information

The difference between sea crabs and river crabs:

1. The carapace of river crabs is nearly square, while the carapace of sea crabs is nearly diamond-shaped. In general, sea crabs are much larger than river crabs.

2. The appearance of river crabs and sea crabs is also different. River crabs have dense small hairs on their legs and claws, while sea crabs do not. Most river crabs are green in color, while sea crabs are brighter in color.

3. Dead river crabs cannot be eaten. There are many bacteria and toxins in their bodies. Dead river crabs are even more poisonous, so they cannot be eaten. However, sea crabs will die soon after being caught, and most of the sea crabs we buy in supermarkets are frozen. Therefore, dead sea crabs can be eaten.

Reference source: Baidu Encyclopedia - Red Crab

Reference source: Baidu Encyclopedia - Flower Crab

Reference source: Baidu Encyclopedia - Flying Crab

1. Flower crab is also known as red-shelled red stone-shelled red sea red.

There are three types of this crab: the first is the green-capped crab, the second is the purple-capped crab, and the third is the flower-capped crab. The purple-capped crab is the largest, the rarest, and the most delicious, and is a treasure of the red-shelled red sea crab. The crab, which has a shell as big as a fist, is usually sold for 50 yuan per pound, which is three times the price of a swimming crab of the same size.

2. Flying crab is a synonym for swimming crab.

The body color of the swimming crab varies with the surrounding environment. The individuals living on the sand bottom have a spindle-shaped carapace, slightly raised, with scattered granules on the surface, which are coarser and more concentrated in the gill area. In addition, there are three horizontal granular ridges, one in the stomach area and one in the gill area.

The flying crab is very different from the other two. It looks much thinner and is much lighter than the other two crabs. As for the flower cap and the red-shelled crab, I personally think they are actually the same crab. They just have different protective colors due to the habitat and competitive status of the same species. I have raised a 5cm flower cap. After about a week, it has a tendency to develop into a red-shelled crab. The color of the carapace and claws has deepened, and the chin has begun to turn blue. The other smaller flower caps have no color changes at all.

2. What is the difference between swimming crabs and blue crabs?

Appearance differences 1. Blue crab: The carapace and appendages of blue crabs are green-edged. The carapace is smooth and slightly raised, with obvious "H"-shaped indentations on the back, and four protruding triangular teeth on the carapace of the head and eyes. Crabs vary in size and have thorns. Hairy crab: The hairy crab has a blue carapace and a white abdomen with a slight yellow or brown tint. The claws of Yangcheng Lake hairy crabs are golden yellow in tip, and the claws are strong and powerful, allowing them to crawl freely on the surface of floor tiles. The claws of Chinese hairy crabs have fine short hairs. Fullness differences 2. Blue crab: The fullness of blue crabs is easy to judge because blue crabs are meat crabs. Even small blue crabs are meaty, so as long as the weight reaches a certain level, the blue crab is full. Hairy crab: The hairy crab is a crab that is easy to judge the fullness of the meat. Just press the hairy crab's thinnest calf. If it feels full, it means the meat is full. If it is empty, it means the hairy crab's meat is not full enough. Sexual maturity difference 3. Blue crab: In areas with suitable temperature, blue crabs will enter sexual maturity as long as a single crab reaches a certain weight, so there will be sexual maturity all year round. Hairy crab: The sexual maturity of hairy crabs is in the ninth month of the lunar calendar every year. Nine females and ten males say that hairy crabs with crab roe are eaten in the ninth month of the lunar calendar. Usually the belly of a hairy crab with crab roe will be slightly yellow, and it will feel full and transparent. Differences in nutritional ingredients Blue crab: Blue crabs are rich in protein, some carbohydrates are the source of the sweetness of blue crabs, and some unsaturated fatty acids. At the same time, the content of vitamin A, carotene and minerals is also high. Hairy crab: The protein and fat content of hairy crabs is higher than that of blue crabs, but the carbohydrate content is lower than that of blue crabs, and the mineral content is also high, mainly the vitamin and carotene content is lower than that of blue crabs.

3. What are the differences between blue crabs and swimming crabs?

1. Appearance difference:

Blue crab: The shell and appendages of the blue crab are green in color. The cephalothorax is slightly oval, with a smooth surface and a slight bulge in the center. There is an obvious H-shaped depression on the surface of the carapace. There are four equal-sized teeth on the forehead. The chelicerae are smooth, asymmetrical, and have spines. The i-legs at the back have no spines.

Swimming crab: The body color of the swimming crab will change with the environment. Usually the male crab is tea green, the female crab is purple, and the ventral side is grayish white. Its cephalothorax is fusiform, with three prominent wart-like protrusions on the surface, spines on both sides, and a slightly raised shell with scattered particles on the surface.

2. Difference in nutritional ingredients:

Blue crab: Blue crab contains more carbohydrates, relatively low protein and fat content, and rich mineral elements, among which potassium ions are higher than sodium ions. It is also rich in vitamin A and carotene.

Swimming crab: Swimming crab contains lower carbohydrates, higher protein and fat than blue crab, rich in mineral elements, and better calcium-phosphorus ratio than blue crab, but the vitamin content is very low, especially carotene and vitamin A.

3. Differences in eating methods:

Blue crab: Blue crab has tender meat and sweet taste, so the most common way to eat it is steaming, which can highlight the salty and sweet taste of blue crab. In addition to steaming, it can also be cooked in other ways such as savory and spicy.

Swimming crab: Steaming is also a good way to eat swimming crabs. Because swimming crabs are large and have a lot of meat, they are also used to make side dishes, such as fried rice cake with swimming crabs, which tastes great.