How to cultivate high-quality dungling crab seedlings, whether high protein seedlings really lead to crab precocious puberty as many people think, how to choose the right compound feed to carry out crab cultivation, see the boss of Xinghua City, Jiangsu Province is How to find the answer.
Why hard crabs are hard to find
In 2015, the national crab breeding area was 7 million mu and the overall output was about 600,000 tons. The crab breeding industry has become one of the pillar industries of aquaculture in China. However, the problems that have hampered the healthy development of the crab breeding industry have also been highlighted. The most important issue is the decline in seed quality. In recent years, diseases such as “water scorpions†have continued to ravage in the main crab breeding areas, and most people think that it may have a great relationship with the quality of crabs. Since the booming crab boom in the country in the 1990s, crabs in the Yangtze River system have been heavily fished and resources have been severely damaged. After the crabs were transplanted to the north and south populations, crosses of crabs from different river systems resulted in a significant decline in germplasm quality. In addition, the deduction of crab seedlings industry relies mainly on farmers' small-scale farmer business models. The concept of employees is relatively backward. Many people believe that the selection of high protein feed will inevitably lead to crab precocious puberty. As a result, up to 60% to 70% of the crab farmers stubbornly The selection of low-protein (20%~26%) cheap compound feed for seedlings resulted in poor resistance to crab seedlings. At present, the big eye larvae that are bred from the crab breeding grounds are “mixed fish and dragonsâ€, and it is difficult for the seedlings of the high-quality seedlings in the seedling market to seek for, and the poor-quality seedlings are sold at a flat price.
Good selection of seedlings, use of materials, and scientific management are indispensable
How to cultivate high-quality dungling crab seedlings, whether high protein seedlings as many people think will lead to crab precocious puberty, how to choose the appropriate compound feed for dung beetle cultivation, the author believes that the following three aspects are very important:
First of all, choose seedlings carefully, try to choose large-scale or river crab nursery that cooperates with scientific research institutions. When selecting big-eyed larvae, pay attention to selecting large particles, uniform specifications, coloring with yellow water after soaking in fresh water, and pinching in hands. It is better to have an individual with a quick grip after loosening their hands. Dissecting these large-eyed larvae will find that their food lines are plump, clear, and the liver and pancreas are yellow.
Secondly, in the period of crab breeding, the choice of feed is also a top priority. The selection of feeds with different quality and protein content may lead to significant differences in the growth of the same batch of crabs. The high-quality, high-protein, full-ripened compound feed has uniform particle size, good stability in water, full-ripe seedling nutrition balance, crab seedlings are more easily absorbed, adequate nutrition is obtained, abnormal development and oyster shell is neat, liver protection and liver protection, and crab immunity are enhanced. , improve the survival rate.
Again, pay attention to the management of the pond. Clear pond work should be done well before macrolarvae are stocked. After the ponds are disinfected with quicklime, bleach, etc., the ponds should be cleaned for 7 days to 15 days to eliminate predators and install anti-escape facilities; Most of the areas in the area choose to grow water peanuts, covering at least 1/2 of the surface of the pond. In the whole process of crab cultivation, the water salinity is controlled below 3‰, and the water is changed once every 2 months. The water exchange volume should be controlled at about 1/4, splash lime 1 times, and strengthen water quality management in high temperature season. Crab pond water transparency is maintained at 30 cm ~ 40 cm is appropriate. When the transparency is low, fresh water can be injected after the bottom water (1/4) is properly pumped, and the temperature difference in the pond before and after changing the water should be kept within 3°C. The hot weather in summer must be changed in time, but the water change is prohibited during the shell period. During the high temperature period in midsummer, the water level should be raised properly. Feeding a low-protein (32%) full-ripening compound feed can effectively prevent the accumulation of effective temperature in the crab and cause crab precociousness. From July to September, every half a month, with a certain amount of EM bacteria and photosynthetic bacteria Quanchiposa, to maintain the balance of algae and bacteria in the water. The pH of the water body should be maintained at 7.5-8.5, and the dissolved oxygen in the pool water should be kept above 5 mg/L. The author suggests that the Yucui Crab Pond should be equipped with aeration equipment at the bottom to prevent the lack of oxygen in the crab seedlings and affect the growth.
Example show
Liu boss of Anfeng Town, Xinghua City, Jiangsu Province raised crabs for many years. Currently, there are about 3 acres of buttoned crab seedling ponds. In recent years, the effect of raising and holding crabs has been good and bad. It is extremely difficult for him to find the law. . He learned through consulting experts that the “Changjiang No. 2†crab seedling cultivated by the Institute of Freshwater Fisheries of Jiangsu Province this year has completely eliminated seedling pathogens throughout the nursery process, from the time of parent selection to the bigeye larval stage. Detection of pathogens such as sporozoites ensures the health of crabs. Therefore, he chose the "Yangtze River 2" seedling with a mentality of trying it out.
In terms of feed, Liu bosses raised crabs for many years and is a loyal user of Tianbang's full-ripened river crabs. He learned that Tianbang has introduced 32% to 48% protein for this year's high-end, fully-ripened crab seedlings with a balanced nutritional profile. The aging rate is as high as 98%. Crab seedlings are more easily digested and absorbed, and their growth is even. Hepatoprotective liver can effectively enhance the immunity of the buttoned crab seedlings and increase the survival rate of the buttoned crab seedlings. Therefore, he readily tried Tianbang's full-ripening crab material and high-efficiency eco-duck crab to cultivate feed use packages.
After all, Liu Bo is the first batch of people who eat crabs. Many farmers around them still think that high-protein feeds tend to lead to precocious puberty crabs and choose low protein materials. He did the opposite and devoted so much effort. What effect will this year's dunking crab seed produce? He also guilty in his heart.
On August 17, Pan Jianlin, Director of the Institute of Freshwater Fisheries of Jiangsu Province, Lu Yuxiao, Dean of the Tianbang Research Institute, and Zhao Shuaibing, Director of the Institute of Fisheries of the Tianbang Institute, accompanied by Hu Jiajun, General Manager of the Tianbang Feed Division and Sales Department, Together came to Liu boss Tongkou for research. It was found that Liu Boss put 3 pounds of "Changjiang No. 2" big eye larvae per acre in early May this year. By the August 17th, the crab seedlings were evenly sized, the backs of the crabs were yellow-green, the food line was clear and full, the hepatopancreas was golden and bright, and the appendages Complete, powerful crawling, quick response, female crab chela villus and step foot bristles are short and sparse, smaller umbilical not long, triangular, thin villi on the edge, looks thin, and with the head and chest paste It's tight and not easy to open. Did not find the back shell dark green, abdomen is complete and surrounded by bristly or abdominal umbilical base section uplift, the color is yellow, the transfer of bone hardening has become mature "small old crab", the legendary high protein seedling cultivation crab meeting The phenomenon of precocious puberty did not occur. Liu's doubts swept away. As of September 9, it had reached 120/kg.
The quality of pathogen-free seedlings and the quality of Tianbang's high-protein, fully-ripened crab seedlings, coupled with the meticulous day-to-day management, are indispensable. The development of the times, the change of ideas, and the persistence of opinions, will surely be eliminated by the rapid development of science and technology.
An insulin pen injector is a medical device used by people with diabetes to inject insulin into their body. It looks like a pen and has a cartridge filled with insulin that is inserted into the device. The pen has a dial that can be turned to select the desired dose of insulin, and a button that is pressed to inject the insulin into the body. Insulin pen injectors are convenient and easy to use, making it easier for people with diabetes to manage their insulin therapy. They are available in both disposable and reusable forms, and can be used with different types of insulin.
Insulin Pen Injector,Insulin Glargine Pen,Disposable Pen,Insulin Pen Cartridges
Shanghai Enjosim Medical Technology Co., Ltd , https://www.enjosimmedical.com