Crab three questions

Gaochun breeding household pond exit booting oxygen. Ding Weiwen/Photo

River crab breeding is the most distinctive and influential led pillar industry in freshwater fisheries in our province. At present, the province's total breeding area is about 4 million mu, and the annual output value exceeds 30 billion yuan. In July and August of this year, the extreme high temperature and continuous drought that had not encountered 60 years of years in the Yangtze River Basin brought severe challenges to the province's river crab breeding: the water quality of the crab pond decreased, the mortality rate of crabs increased, and the growth was slow. Abandoned.

Copy the adverse effects of continuous high temperature, how can crab farmers fight for disaster relief? What is the market expectation of crabs this autumn and winter? Faced with the normal trend of high temperatures that may occur, how should the crabs be raised in the future? With these issues, Xinhua Daily · Daily reporter at the end of August and early September, with relevant experts organized by the Provincial Agricultural and Rural Affairs Department in early September, went to Nanjing Gaochun, Suzhou Kunshan and other places to conduct interviews and investigations.

Picture source: Visual China

1 Q:

Crab mortality increases and grows slowly. How can crab farmers emergency?

The survey report of fishery production aquatic products in the province's stabilization and research group shows that high temperature and drought disasters in all parts of the province are not optimistic. Overall conditions are better than southern Jiangsu. Reach 2-10/mu. When dealing with the disaster situation, while the Provincial Agricultural and Rural Affairs Department dispatched expert groups to southern Jiangsu, northern Jiangsu and other places, more than 2,500 aquatic technicians at all levels in the province also went deep into the front line to help crab farmers accurately apply.

There is a river crab breeding area of ​​215,800 acres and 228 million crab seedlings in Gaochun District, Nanjing this year. Ye Ping, deputy director of the Nanjing Agricultural and Rural Bureau, introduced that the crabs need to be molted 5 times. Generally, the fourth shell was molted in mid -July, and each molten shell doubled. This year's continuous high temperature caused Tangkou crabs to delay for a month. Many crabs were not molted, their heads were small, and the mortality rate was high. At the same time, due to the hypoxia and rotten after drought, hydrogen sulfide, ammonia nitrogen, etc. also caused chronic poisoning of crabs. After the temperature dropped, some crabs would still die.

Li Jianwei of Gaochun Nanshan Jindian Nanjing Crab Co., Ltd. raised 500 acres of crabs this year. He told Xinhua Daily · Jiao Dian reporter that the weather was hot and crab eats very little. "Many crabs can't be molted. There are only less than 1.5 dual weights that are not molting now, and the shells are about 2.3 to 2.4. In the past, this time should grow to 2.8 to 3, and the big one can reach 4 or two. "Standing at Tangkou, Xinhua Daily · Jiao Dianjiao reporters can't see the crabs in the Tang Dynasty. Why is this? Li Jianwei said that long -term high temperature, the crab diamonds reached the mud, the original water grass was very cool, and even the mud was hot this year.

Li Jianwei has four ponds planted with Iraza. After the aquatic grass is rotten, some areas are planted with water peanuts and water gourds. "Water peanuts are covered on the water like a quilt, to increase the oxygen -enlarged machine and enhance the permeability." Ge Jiachun, a researcher at the Provincial Institute of Freshwater and Aquatic Products, gave him a suggestion. The water level of standardized farming ponds is about 0.8 meters to 1 meter. Ge Jiachun also instructed Li Jianwei to increase the water level and reduce the water temperature. It is necessary to find a way to add water to 1.2 meters to 1.5 meters. Xing Wenxiang, the head of the Aquatic Products Technology Promotion Station of Gaochun District, suggested that crab farmers, supplementing floating plants such as composite aquatic plants, yellow flowers and water dragons, water gourds, etc. to establish a strip -shaped shade belt. Remove the rotten water grass, add water to cool down, boot the oxygen, and push the bait reasonably. Pan Jianlin, the chief expert of the modern agricultural crab industry in Jiangsu Province, also suggested that the small buckle crab will be reserved and the season will be grabbed next year.

Xinhua Daily · Jiaojiao reporter learned that in many hairy crab breeding areas in our province, local aquaculture technicians instructed farmers to help crabs "high temperatures" through the "crab grass symbiosis" model. Changzhou formed 7 guidance groups to enter the village to guide farmers to cross the difficulty. Zhenjiang City organized the city and county fishery technicians to form a "Yafang Technology Troupe" team, which linked to aquaculture enterprises to "put the pulse" on the spot to guide the disaster prevention reduction and loss of breeding households, and minimized the impact of high temperature on crab breeding.

Picture source: Visual China

2 Q:

The launch is low in production. Will the price of crab in autumn and winter this year "walk sideways"?

Affected by high temperature and drought, what is the expected crab market in our province this year?

The listing time is delayed. Xinhua Daily · Jiaojiao reporter learned that this year's major hairy crab production areas in our province have been affected by high temperatures to varying degrees. Mid -Autumn Festival is the first small peak of hairy crabs in previous years. Crab listings are postponed. In addition, this year's Mid -Autumn Festival will be advanced to September 10 this year, about 10 days earlier than usual. The Mid -Autumn Festival is basically not available in mature hairy crabs. The "June yellow" of about two or two five can be served on the dining table. "Gaochun crab is going to be listed on the Mid -Autumn Festival. The post -listing will affect the increase in crab farmers' income this year." Zhang Jianjun, deputy director of the Provincial Department of Agriculture and Rural Affairs, was worried.

"In the Mid -Autumn Festival, our base has not been listed on mature crabs, basically whiteboards. Unexpected crabs have fewer shells and have less flesh shells, and they have a bit bitter taste. Dahan dare not pick up at all." Li Jianwei told Xinhua Daily · Junior Reporter. Zhang Minglong, general manager of Nanjing Liangzhuang Agricultural Products Co., Ltd. introduced to Xinhua Daily · Jiao Dian reporter: "From the perspective of the current situation, Gaochun Gucheng Lake crabs will be listed on a large scale until the end of September and early October." The fullness is not enough to meet the requirements of the catching. Crab farmers generally estimate that the arrest will not be started until the end of September, and it is also impossible to keep up with the Mid -Autumn Festival. Yangcheng Lake hairy crabs are more mature and late in production areas such as Hongze Lake. This year, Yangcheng Lake hairy crabs are expected to be listed on October 15. What will happen after the listing of hairy crabs this year? Will it "walk sideways"? Diners are concerned.

This year, crabs are generally smaller than normal years and low yield. The harvest of crab farmers is expected to be reduced by 20 %. Affected by high temperature, Yangcheng Lake, Hongze Lake, and Xinghua, Gao Chun and other production areas have more dead crabs than in previous years. It is expected that the production of crabs will lose about 20%. Li Jianwei said that originally expected that their base crabs were about 300 catties per mu, and the total output was about 130,000 kg. Now it looks at the at least 250 pounds per acre, and the output will be 15%-20%compared with last year.

Good crab price rose. Yang Weidong, a professional cooperative of Xinghua Dongtao buckle crab breeding, said, "This year's breeding difficulty is much larger than in previous years. During the process of four -shell molting, hairy crabs are much higher than in previous years. The cost of breeding has increased significantly. After the hairy crabs were launched in late September, the price must rise! "Li Jianwei also expected that the price of Gasheng Lake hairy crabs would be relatively high.

According to the data of the Yangcheng Lake Hairy Crab Association, the overall output of Yangcheng Lake hairy crabs last year was 10,900 tons. It is expected that the hairy crabs from 3 and two to 4 this year accounted for about 50 %. Relevant personnel predict that things are rare, and the price of high -quality hairy crabs this year will rise by 20%.

Picture source: Visual China

3 Q:

To deal with the normalization trend of high temperature, how should the crabs be raised in the future?

Meteorologists predict that similar to high temperature weather this summer may continue to appear in the future. In response to the normalization trend of high temperature, experts said that the concept and model of crab farmers in our province need to be changed urgently.

"The grass -planting mode must be changed." Pan Jianlin suggested that next year, the crab pond breeding in our province should plant composite water plants. In the early days, Iraza, Ringye Black Algae, and bitter grass were planted. Xinhua Daily · Jiaojiao Reporter learned that there are different water grass crab -raising models in different production areas of our province. Le Alties. Two -thirds of the waterweed in Gaochuntangkou is bitter grass, and the high temperature loss is small. "In response to high temperature weather, in addition to composite water plants, you can plant some yellow flower gourds. It grows fast and has a well -developed root system. After forming a floating bed, the gap between the roots of the stems is greater and the transparency is good. Crab can molt inside." Ge Jiachun said.

Qin Liang, the head of Jindan Jiangsu Changhu Agricultural Corporation, told Xinhua Daily · Jiao Dianjian reporter, "It lost this year to plant composite water plants and keep 200 acres of pond crabs." Half of the local breeding households grown in Iraza, and the losses were heavy. Golden Altar Changyang Lake Crab Breeding Technology and Model lead the country. Most of the dangkou is planted in Iramia. The density of crabs and high yields can reach 300 to 400 catties. It is particularly good, but when it comes to high temperature weather, it is easy to die of oxygen.

"In addition to changing the grass -planting mode, the breeding varieties and models must be adjusted to release crab seedlings early." Pan Jianlin suggested that "the breeding density should be reduced."

Crab is not just big, but also delicious. Li Jianwei introduced that Gaochun crab is generally the second mother (two -two mother crabs) in the Mid -Autumn Festival, and the fourth mother (four -two mother crabs) may not be delicious. There are large -scale crab seedlings now, and there is a way to raise crabs. . Now put one or two thousand, you can't keep the bitter grass. For the good quality of the crab, you planted Iraza. When you encounter high temperature, Ileza can't keep it. The release density is 1300-1400 per mu, and the risk is relatively high. Do not put crabs too high, the price of a single boutique crab is sold, and crab farmers do not need to risk such a big risk. "Those who have sales should raise boutiques, technically engage in ecological breeding lobster, etc., shrimp raising in the first half of the year, stocking two stubbles. There is also the" June Yellow "model, which sold 'June yellow' set up ","

Picture source: Visual China

Xu Ran, Xu Run, the Tamsui Fisheries Research Center of the China Institute of Aquatic Sciences, suggested that the pond breeding industry model is concentrated according to the "863" model to reduce the breeding density. The output value of the acre is 30,000 yuan, the hairy crabs increased, and the output increased. "Yangcheng Lake Water system is weak and alkaline, and the crab raised crab tastes a bit sweet. The price is more than doubled than the market and the same specifications crab." This year, high temperatures, the farming in Yangcheng Lake district has a small impact due to water depth. The essence mode, the breeding density is small and obviously benefited.

"The sales model must be changed, and good crabs have to be sold for a good price." Li Jianwei is more cautious in the sales price of crab crabs this year. This year, the price of the Mid -Autumn Festival crabs will be relatively high, and it will be listed in two months in the later period. The third is that if the epidemic is repeated, the price of crabs is uncontrollable. He suggested that crab farmers "have no channels to sell quickly, and they cannot be sold." The brand's price is great, and it is necessary to pay more attention to the brand's crab raising. "The crabs are one or two long, and the price is different." Yangcheng Lake Crab Farm Huang Zongnan has the output of hairy crabs about 56,000 kilograms each year in recent years. It was bought out by Suzhou Chuntai Agricultural Products Development Co., Ltd., and there was almost no pressure on sales. Xinhua Daily · Jiaojiao Reporter saw in the lake area that Huang Zong's male crab has weighed four or two. "At the end of September, it was still in the fattening stage.

Yangcheng Lake hairy crabs are the benchmarks of the crab industry in the country. "Kunshan Marketing Yangcheng Lake hairy crabs do the best." Kunshan Agricultural and Rural Bureau Director Ji Huaming introduced that only 3,000 acres of crabs in Kunshan Pakistani, only 3,000 acres of crabs, attracted 300 tourists from other places. 10,000 people, an output value of more than 3 billion yuan. He believes that now, the market risks are highly a pure farmers who do not have brands and lack marketing channels. Crab farmers must actively change their business models. High -quality river crabs in other parts of our province have raised crab brands, integrate production and sales, and directly connect to end customers for brand marketing to enhance profitability and anti -risk capabilities.

Xinhua Daily · Jiaojiao Reporter Ding Weiwen

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