The blue crab is a beach crab that lives in mudflats or muddy sandy beaches. It prefers to stay in mudflats and rock seams. Cave dwellers during the day, foraging around the night. Especially during the high tide night, it appears to be more active. Because of its sensitive eyes and tentacles, it is able to move freely at night. Summer crab activities are more frequent, and when the low tide is shallow, the water is often hidden at the bottom of the mud to avoid heat, and sometimes it can be seen in groups. During the dry heat, the blue crab walks away from the beach with high temperatures and cools off. In winter, there is less activity. When the weather is cold, it darks near the low tide for winter, and the size and depth of caverns increase with the size of the individual and the tide area. Deepening, caves in the high tide area can sometimes reach more than 1 meter. The blue crab moves backwards and forwards frequently in the water depending on the footsteps, but in most cases, it moves with the flow, and it can quickly recede when it is frightened or encounters obstacles. It crawls on the beach side and feels agile and moves freely. .
Green crab is a wide-temperature, wide-salt, salty marine crab. Its living water temperature is 7 to 37C, suitable for growing water temperature 15 to 31C, and the optimum water temperature is 18 to 25C. When the temperature is 15C or less, the growth is slowed down and the water temperature drops to 7 to 8.5C. Stop feeding and activities and go into hibernation and burrowing. When the water temperature stabilizes above 18C, female crabs begin to lay eggs, and the young crabs frequently grow and hulling. When the water temperature rises above 37C, the crabs do not ingest food. When the water temperature rises to 39C, the gray crab's dorsal armor appears gray spots. The body is gradually aging and dead.
The crab's survival salinity is 2.6 to 55 ‰, and the range of adaptation is 6.5 ‰ to 33 ‰, and the optimal salinity is 12.8 ‰ to 26.2 ‰ (specific gravity 1.010 to 1.021). It is difficult for crabs to adapt to drastic changes in salinity, and mutations in salinity can cause both "Hongmang" and "Pangong" diseases and even death. Therefore, in the rainy season of each year, due to sudden heavy rain or continuous rainfall in a short period of time, the abrupt changes in the salinity of artificial breeding ponds increase the mortality of blue crabs.
The crab has strong drought resistance. After the water is removed, as long as there is a small amount of water in the larvae and the silk is moist, it can survive for several days or dozens of days.
The food of green crab is very complicated, mainly animal food. The food composition is dominated by mollusks and small crustaceans, and bivalve shell edges, twisted parts, gastropods, incomplete screw shafts, stumps and heads of crabs often appear in stomach contents. Breastplate fragments. Green crabs also often feed on beach worms, and also eat small fish and shrimp. Sometimes there are also pieces of stems and leaves found in the stomach. Artificially cultivated blue crabs have no strict choices for bait, small fish, shrimp, and small shellfish (blue pheasant, fork's muscle, river bream, clam, etc.), soybean cakes, and peanut cakes can be eaten. There are habits of killing each other in the same category, and they often eat soft shelled crabs that have just shelled.
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