The living habits of crayfish, the characteristics of crayfish

Crayfish has a wide range of adaptability, has a wide range of suitable growth temperatures, and can grow and develop normally when the water temperature is 10-30. It can also withstand high temperatures and severe cold, can withstand high temperatures above 40, and can also survive the winter safely when the temperature is below -14. Crayfish grow rapidly, in the case of suitable temperature and sufficient bait, after more than 2 months of breeding, you can reach sexual maturity and reach the specifications of commercial shrimp, generally male shrimp grow faster than female shrimp, and the size of commercial shrimp is larger than that of female shrimp.

Like many crustaceans, crayfish grow with molting, which is often sought out for shelter, such as in aquatic weeds or under plant leaves. The maximum weight gain after molting can reach 95%, and sexual maturity can be reached after 11 times of molting, and sexually mature individuals can continue to molt and grow. Its lifespan is not long, about 1 year.

But in the case of food scarcity, lower temperatures and drought, the lifespan can be up to 2-3 years.

During the breeding season, burrows are plucked. The cave is located about 20 cm above the surface of the pond and has a depth of 60 cm to 60 cm, with a small amount of stagnant water in it to maintain humidity, and the entrance is generally sealed with a mud cap to reduce water loss. On summer nights or after heavy rainstorms, it has a habit of climbing ashore and crossing dikes and entering other bodies of water.

Crayfish are omnivores, and in terms of eating habits, crayfish prefer to eat mud at the bottom of the river, and like to eat small fish or other aquatic organisms that have died. It mainly eats plants, small fish, shrimp, plankton, benthic organisms, and algae can all be used as its food. The astaxanthin content of the body is positively correlated with its ability to resist the external harsh environment, which means that the higher the astaxanthin content of the body, the stronger its ability to resist the external harsh environment.

Crayfish cannot produce astaxanthin on their own, mainly through the food chain - edible microalgae, etc., astaxanthin is obtained, and it continues to accumulate in the body to produce super antioxidant capacity. Astaxanthin can effectively enhance the ability of crayfish to resist harsh environment and improve reproductive ability. Therefore, astaxanthin is a strong guarantee for the tenacious vitality of crayfish, and it is difficult for crayfish to survive in an environment that lacks these astaxanthin-containing microalgae.

This also gives people some illusions that crayfish have to live in a dirty environment.

Crayfish features.

Crayfish has strong adaptability, fast reproduction, rapid migration, and likes to dig holes, which has a certain destructive effect on crops, embankments and farmland water conservancy facilities. In Japan, it has long been regarded as a predator, and many people are still worried. However, the crayfish's burrowing ability, climbing ability, and movement speed on land are far weaker than that of the Chinese mitten crab.

On the whole, crayfish, as an aquatic resource, has more advantages than disadvantages to human beings, and has high development value. As a farmed species, crayfish has the following advantages:

1. Crayfish has strong adaptability to the environment, few diseases, and can grow in lakes, ponds, ditches, paddy fields and other water bodies, and the breeding conditions are not high, and the breeding technology is easy to popularize.

2. Crayfish can directly convert plants into animal protein, and the growth rate is fast, generally after 3 or 4 months of breeding, it can reach the market specifications, so it has a high energy conversion rate.

3. Crayfish eat miscellaneous, mainly feed on organic detritus, aquatic plants, and animal carcasses in the water body, without feeding special feed, not only low breeding cost, but also fast growth, high yield and good efficiency.

4. The crayfish fishing method is simple, it can leave the water for a long time, it is convenient to transport, and the survival rate of transportation is high. It saves time, labor and low cost in fishing and product transportation, and farmed fish cannot be compared with it.

5. Crayfish is delicious and nutritious, it is a home-cooked dish for the urban and rural masses in China, and it is also the main export variety of freshwater aquatic products in China, which is welcomed by the domestic and foreign markets, and the products are in short supply and have broad market prospects.

Hello in reply, crayfish are stout in size, with thick carapace and dark red color. The body is covered with a sharp and hard chitin shell, and the body is composed of 21 segments of cephalothorax and abdomen, the cephalothorax is slightly larger, and the head has 3 pairs of tentacles, the tentacles are thick near the head, and the tip is small and pointed. There are 5 pairs of feet on the chest, 1 3 pairs of feet with pincers at the ends, and 4 5 pairs of feet with claws at the ends.

The second pair of feet is particularly well developed and becomes a large chela, and the chela of the male shrimp is more developed than that of the female. The crayfish has 5 powerful tail fans at the tail, and the female shrimp bends inward during the egg-holding and hatching periods, and protects the fertilized eggs or juvenile shrimp from damage when crawling or being attacked by enemies.

Crayfish is a kind of crustacean like lobster that lives in freshwater, and its scientific name is crayfish, also known as crayfish or freshwater crayfish. Crayfish is the most widespread invasive alien species among crustaceans. Crayfish crayfish has formed an absolute competitive advantage in the local ecological environment because of its omnivorous, fast growth rate and strong adaptability.

It feeds on aquatic weeds, algae, aquatic insects, animal carcasses, etc., and kills each other when food is scarce. Crayfish has become an important economic aquaculture species in China in recent years. In the process of commercial farming, escape should be strictly prevented, especially into the inaccessible original ecological water body.

Peculiarity. 1. Crayfish has a very strong ability to survive, in addition to Japan and China, Europe and Africa also have the territory it occupies, so it has become a world-class biological invasive species, and therefore a world-class delicacy.

2. Crayfish has a certain enrichment ability of heavy metals, but most of them are concentrated in the gills, internal organs and shells of shrimp that we don't like to eat.

Growing environment: From June to August every year, it is the time when the crayfish is the most "plump", and this is also the best time for people to catch and enjoy it. Green artemisia grass, shallow shoals, this water area is where Lao Gan and they often catch lobsters.

Some people say: crayfish like to live in dirty places, the dirtier the crayfish grows, it is a very dirty food, rich in pathogens, such as pathogenic microorganisms and parasites. According to research, it is best to eat less or no crayfish.

Crayfish are good at "going with the flow", rivers, lakes, reservoirs, rice fields, and ponds can all become a safe place for crayfish. When the water temperature rises in spring, the crayfish often move in shallow water, and in the middle of summer, when the temperature rises, it lurks in deep water, and in winter and when it sheds its shells and breeds, the crayfish spends its time in burrows to prevent other animals from attacking.

Crayfish not only have strong feeding ability, but also have the habit of gluttony and competition for food. In the case of high reproductive density or starvation, cannibalism can occur between crayfish, and freshly shelled crayfish and juvenile shrimp often become a "meal" for "strong" lobsters.

From June to August every year, it is the time when the crayfish is the most "plump", and the crayfish shell at this time is hard and thick, and it is also the best time for people to catch and enjoy it.

The rumor that the dirtier the place, the better the crayfish grow, is unfounded. On the contrary, crayfish have certain requirements for the growing environment, and if the environment is too dirty, it will affect its growth.

Crayfish inhabit permanent streams and swamps, temporary habitats, including ditches and ponds. In streams, they are often mixed with plant or woody detritus, which can damage and weaken the embankment. Lives in wetlands, lakes and ditches with shallow water bodies and abundant aquatic weeds.

The species is found in a wide range of habitat types, including wetland meadows, subterranean karst systems, seasonal marshes and marshes, permanent lakes and streams, rice paddies, irrigation channels, and reservoirs. This species is able to tolerate a range of environmental conditions, including low oxygen levels and high temperatures.

1. Nocturnal nature of crayfish: Crayfish is a nocturnal species, and will hide in shady places such as aquatic plants and caves during the day, and will only come out to move and forage at night.

2. Omnivorous nature of crayfish: Crayfish is an omnivorous cavity-tolerant species, which not only likes animal bait, but also feeds on plant bait. Therefore, it is required to plant aquatic weeds in crayfish farming, and bait feeding needs to be balanced and scientifically fed.

3. The fighting nature of crayfish: Crayfish has strong aggressiveness and fighting ability on the surface, but the actual situation is that the fighting nature of crayfish is weak and poor, and everything is based on its own defense.

4. Crayfish burrowing: crayfish will be burrowed in the breeding season, winter wintering and harsh breeding conditions, crayfish burrowing is the guarantee of population continuation, and cannot be forced to intervene manually for factors such as high yield of breeding.

5. The reproductive habits of crayfish: crayfish can be self-breeding and self-breeding, crayfish mate from May to September every year, and reproduce in autumn and winter when the conditions are suitable, and crayfish only breed once a year.