When are swimming crabs available? The living habits of swimming crabs

The male has a pointed and smooth navel, long claws, and a green shell surface; the female has a round and hairy navel, and the shell surface is ochre or spotted. The swimming crab meat is fat and delicious, with high nutritional value and economic value, and is suitable for temporary breeding and fattening in seawater. When will swimming crabs be on the market? What is the listing price of swimming crabs? The living habits of swimming crabs, then let's learn more about swimming crabs!

Contents of this article

1. When will swimming crabs be available on the market?

2. The market price of swimming crab

3. The living habits of swimming crabs

4. What should you pay attention to when eating swimming crabs?

When are swimming crabs available?

The best time to eat swimming crabs is from August to November every year. This period is mainly the period of feeding and fattening, and the body width can reach 100-130 mm. Mature individuals mate before wintering, and the mating time can last for 1-2 days. During this process, male crabs often swim with female crabs. Swimming crabs at this time are the fattest.

The market price of swimming crab

The price of swimming crabs varies according to their size. For example, the price of wild swimming crabs weighing more than one kilogram is more than 80 yuan. And the stall owner has no worries about sales.

The male has a pointed and smooth navel, long claws, and a green shell surface; the female has a round and hairy navel, and the shell surface is ochre or spotted. The meat of the swimming crab is fat and delicious, with high nutritional and economic value, and is suitable for temporary breeding in seawater to increase fat.

The cephalothorax is fusiform, almost twice as wide as it is long; the surface of the cephalothorax is covered with fine granules, with two transverse ridges and three wart-like protrusions; the forehead has two sharp teeth; the front edge has nine sharp teeth, the last tooth is long and thorn-like, protruding outward.

A species of the genus Portunidae, family Portunidae, order Brachyura, also known as Swimming Crab, named because of its fusiform cephalothorax and three prominent tubercles on the back of the stomach and heart regions.

The life habits of swimming crabs

Water temperature

The water temperature that it adapts to is 8~31℃, and the optimal water temperature for growth is 15.5~26.0℃.

The activity of the swimming crab varies in different temperature environments. When the water temperature is below 1.5℃, it does not eat, and some individuals freeze to death in shallow waters; when the temperature is between 0 and 6℃, it does not eat, burrows in the sand day and night, and is in a dormant state; when the temperature is between 8 and 10℃, it begins to stop eating, has weak activity, and lurks in deep waters; when the temperature is between 14℃, the amount of food consumed decreases, and it begins to move to deep areas, with normal activity; when the temperature is between 15 and 26℃, the amount of food consumed is large, the activity is normal, and the growth is fast; when the temperature is between 17 and 21℃, it is the peak mating period; when the temperature is between 14 and 21℃, egg-carrying groups begin to be found; when the temperature is between 12 and 14℃, it begins to lay eggs.

salinity

The adapted salinity is 13-38‰, and the optimal growth salinity is 20-35‰. The adapted salinity for wintering is 28-35‰. When the salinity is lower than 8‰ or higher than 38‰, the fish will stop eating and moving, and all will die after one day.

other

The pH value adaptation range is 7.5~8.; the dissolved oxygen cannot be lower than 2 mg/L, the chemical oxygen demand generally does not exceed 12 mg/L; the hydrogen sulfide does not exceed 0.2 mg/L; the half-lethal concentration of copper ions within 24 hours is 58 mg/L.

illumination

Swimming crabs lurk on the seabed during the day and come out to forage at night, and have a clear tendency to move toward light. Swimming crabs raised in ponds show a more obvious vertical movement during the day and night at sunrise and sunset.

What should you pay attention to when eating swimming crabs?

1. Crabs are salty and cold in nature, and they are scavengers, so when eating them, they must be dipped in ginger vinegar to dispel the cold and kill bacteria. They should not be eaten alone;

2. The gills, sandbags and internal organs of crabs contain a lot of bacteria and toxins, so they must be removed when eating;

3. Unripe crabs such as drunken crabs or pickled crabs should not be eaten. They should be steamed and cooked thoroughly before eating. Cooked crabs that have been stored for too long should not be eaten. They should not be eaten with tea. Do not drink tea while eating crabs or within 1 hour after eating crabs. When crabs are fat, it is the season when persimmons are ripe. Be careful not to mix crabs and persimmons.