CATDOLL : CATDOLL: What is the temperature for raising crabs?

1. What is the temperature for raising crabs?

23 to 28

2. Suitable temperature for transporting and breeding sea crabs

The temperature for transportation is 1-3 degrees, and for breeding is 20-28 degrees.

3. What is the lowest temperature at which sea crabs can survive?

The lowest temperature is minus 1 degree Celsius, and minus 1.5 degrees Celsius can be fatal.

The scientific name of the sea crab is the swimming crab. In nature, the swimming crab lives in shallow waters near the coast, in areas with a water depth of 10-50 meters, and the densest population is in areas with a muddy bottom of 10-30 meters. The swimming crab lives in the deeper seabed in winter and hibernates.

The swimming crab is a wide-temperature aquatic animal. Its suitable growth temperature is 17-30℃, and the optimal growth temperature is 25-28℃. When the water temperature is lower than 6℃, the swimming crab enters hibernation. The lethal temperature of low temperature is -1.5℃, and the lethal temperature of high temperature is 35℃.

The swimming crab is euryhaline, with a suitable salinity of 10-35‰ and an optimum salinity of 25-30‰. The swimming crab has a strong tolerance to drought, and can survive exposure to the sun for 8 hours at 20℃, and for 26 hours at 2-4℃.

Additional information:

Main value:

Economic Value

The swimming crab is a large commercial crab in China's marine life. It is well-known both at home and abroad for its delicious meat, rich nutrition and high economic value.

As the swimming crab has the characteristics of fast growth, strong environmental adaptability, high market price, and stable price both at home and abroad, the breeding of swimming crab has been increasing in various places. It has become another important breeding species after shrimp and blue crab, and has achieved good social and economic benefits.

The swimming crab is the leading fishery species in Zhejiang Province, China, and is also the main breeding species promoted by Zhejiang Province's science and technology home program. Swimming crab breeding is one of the four major advantageous industries in Zhejiang Province, and northern Zhejiang is the main industrial belt for swimming crab breeding. In Ningbo and Zhoushan alone, there are more than 19,000 hectares of swimming crab breeding ponds, accounting for about three-quarters of the province.

Medicinal value

Swimming crab is a rare product that can be used as medicine and tonic. It can be used as a tonic to treat wasting diseases such as kidney deficiency, neurasthenia, palpitation, insomnia, physical weakness, etc. It has unique effects such as moistening the lungs and nourishing yin, nourishing the brain and improving intelligence, improving human immunity, beautifying and anti-aging.

It is also effective for female infertility, postpartum alacrity and other diseases. Regular consumption can improve endocrine, enhance metabolism, lower blood pressure, blood lipids, blood sugar, resist swelling, regulate and improve people's memory and sexual function, promote growth and development, regulate sexual cycle, and is effective in treating menopausal hormone balance and improving palpitations, insomnia, headache, irritability, etc. It is a health product suitable for both men and women.

Reference source: Baidu Encyclopedia - Swimming Crab

4. What is the water temperature for farmed sea crabs to eat normally?

The adapted water temperature is 8~31℃, and the optimal growth water temperature is 15.5~26.0℃. The activities of the three-spotted swimming crab are different in different water temperature environments. When the water temperature is ~1.5℃, it does not eat, and some individuals freeze to death in shallow water areas; when the water temperature is 0~6℃, it does not eat, burrows in the sand day and night, and is in a resting state; when it is 8~10℃, it begins to stop eating, has weak activity, and lurks in deep water; when it is 14℃, the amount of food intake decreases, and it begins to move to deep areas, and its activities are normal; when it is 15~26℃, the amount of food intake is large, the activities are normal, and the growth is fast; when it is 17~21℃, it is the peak period of mating; when it is 14~21℃, egg-carrying groups begin to be found; when it is 12~14℃, it begins to lay eggs.

Living habits: Swimming crabs lurk on the seabed during the day and come out to forage at night with obvious phototropism. Swimming crabs raised in ponds show obvious vertical movement during the day and night at sunrise and sunset. When swimming, the body tilts and hangs upside down in the water, and the fifth leg swings frequently, making lateral or non-directional horizontal swimming. When diving into mud and sand, it often forms an angle of 15 to 45 degrees with the bottom of the pond, with only the eyes and antennae exposed. Swimming crabs have no ability to burrow, so there is no need to set up escape prevention facilities for pond breeding. When the water temperature is below 18℃, swimming crabs mostly lurk in the sand pile beside the pond.

Feeding habits: Swimming crabs are omnivorous animals. They like to eat shellfish, fresh fish, small shrimps, etc. They also eat young algae, dead marine animals and rotten aquatic plants. In different growth stages, their feeding habits vary. They tend to be omnivorous in the juvenile crab stage, and tend to be carnivorous as they grow older. They usually eat less during the day and eat a lot in the evening and at night. However, when the water temperature is below 10℃ and above 32℃, swimming crabs stop eating.

Reproduction habits: Swimming crabs are dioecious. The average lifespan is 2 years, rarely more than 3 years. The smallest biological size is 5.1 cm long carapace, the largest male is 11 cm long carapace, 22 cm wide, and weighs 710 grams; the largest female 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 hatching. Males may die after mating for 2-3 days. The mating time of wintering swimming crabs is between July and August each year, while the mating peak of swimming crabs born in the same year is between September and October.