Crayfish came into the market in March, and May-September is its abundant month. The crayfish just listed are not too big, and most of them are concentrated at 4-8 yuan/piece. One or two or more crayfish and crayfish below 3 yuan are rarely seen. When a large number of crayfish are listed in May, they will see very big crayfish.

crayfish can breed all the year round, with the peak period from May to September. Crayfish are hermaphroditic and have obvious secondary sexual characteristics. It can be distinguished from the shape of abdominal swimming limbs. The first abdominal swimming limb of male shrimp is specialized as a mating thorn, while the first abdominal swimming limb of female shrimp is specialized as a sperm hole.

Secondly, there are obvious differences between the two pincers. The male pincers are thick, and there is a bright red wart on the outside of both ends of the pincers, while the female pincers are small and the wart is not obvious. Thirdly, the claw feet of male shrimp are bigger than those of female shrimp, and the individual is bigger than that of female shrimp.

crayfish can mate almost all the year round, but the peak is in spring every year. Mating is generally carried out in an open area in water, and the mating temperature range is large, ranging from 15℃ to 31℃. During mating, the male shrimp injects sperm into the seminal vesicle of the female crab (shrimp) through mating thorns, and the sperm can still be fertilized by storing it in the seminal vesicle for 2-8 months.

After mating, female shrimps dig holes one after another, and when the eggs mature, they complete the process of ovulation, fertilization and larval development in the holes.

Extended information:

In p>219, the first wave of crayfish was listed one month earlier.

Crayfish that were hard to find in farmers' markets were listed in restaurants and hotels in advance.

At 6 pm on March 16th, I walked into the cafeteria of Huanglong Hotel and saw it at a glance. Zhou Bo, the catering manager of Huanglong Hotel, said that the crayfish in the cafeteria are mainly from Jiangsu, and the "Lobster Club" will be launched at this time of the year, but this year's "opening" time is one month earlier than last year.

In fact, what is more "anxious" than hotels are some restaurants that specialize in crayfish. "Lobster restaurants like ours follow the season, usually opening at the end of March, gathering guests in April and entering the peak season in May." The owner of a snack shop in Shengli River Food Street started to choose shrimps at the base just after the 15th day of the first month. At the end of February, the old customers took the lead in eating crayfish.

The reporter visited and found that crawfish have been crawling on the table in the gathering places of supper such as Hedong Road and Shengli River Food Street, but it is still hard to find them in the farmer's market that "Mrs. Ma" likes to visit. Sister Li, who is engaged in aquatic products business in Zhonghe Farmers' Market, said that crayfish will not be listed until Qingming. "Now the price is expensive, and the purchase price is fifty or sixty yuan a catty. There are fewer people buying it, and the purchase is risky."

"Head Lu", a crayfish farmer in Jiangsu, revealed that the crayfish on the market now are either from Guizhou and Yunnan where the climate is warm, or from last year's shrimp sinking or greenhouse culture, and the cost of either is higher, which leads to the high purchase price of crayfish now. "This year's crayfish and shrimp seedlings have just been launched. According to the normal growth trajectory, they will be listed in large quantities after Qingming at the earliest, which will be cheap and delicious."

Baidu Encyclopedia-Crayfish

People's Daily Online-Shanghai Crayfish started to eat, and it was listed two weeks earlier than in previous years

People's Daily Online-the first wave of crayfish was listed one month earlier in 219.