Technical communication

What aquatic species are suitable for factory - based recirculating aquaculture

In the past two years, in the aquatic industry, negative news about typhoons, cold waves, environmental protection and so on abound. In 2018, Mangkhut crossed the historical record again, reaching a level 17. Countless mud ponds in Zhongshan, Panyu, Guangzhou and other places are a vast ocean, and the loss is beyond calculation. The cold air at the end of 2018 also killed a large number of tropical fish in Guangdong. On the eve of the Mid-Autumn Festival in 2018, a heavy rain caused nearly all the crabs in and around Hongze Lake to die, due to various reasons. Hainan, Fujian, Shandong and other places have standardized the discharge of tail water from the aquaculture industry since the regulation of the discharge of tail water from the forbidden farming areas and the regulation of tail water discharge from the aquaculture industry. Factory recirculating aquaculture is no longer what we called a "historical trend" a few years ago, but an imminent matter.

For all our colleagues in the aquatic industry, doing aquatic products is the ultimate benefit. It is very important to choose a good variety. But in so many years of work, we see a lot of people to breed selection with considerable blindness. Here to everybody chat about a few popular varieties for reference.
South American white shrimp
The price of white prawn has always been good and relatively stable. It doesn't fluctuate much in a year. The market consumption space is huge. On top of that, it has a short growth cycle. It usually takes only three months from seedling to finished shrimp out of the pond. If you buy some large seedlings from the seedling farm, the whole breeding process can be shortened to two months. The benefits are considerable. The profitable effect attracted a large number of people inside and outside the industry to invest in this shrimp. But the reality is cruel, South American white shrimp for many years outside the pond breeding success rate is less than 10 percent. In other words, most shrimpers lose money. But for those who quit, there are still those who enter. The demand of the market is constantly expanding. The "siege effect" is still in place.

Investigate its reason, mostly because breeding technology is not excellent cause of. We see in Rudong, a large number of small shed breeding, are used in a very primitive way. The breeding density is not small, but in addition to the aeration fan, there is no water treatment equipment. The so-called diversion of water is basically by constantly sprinkling a variety of drugs in the water to maintain. Of course, there is a master, through their own experience, can also breed success to earn money. But that's a very small percentage. Most people, in the later stage of culture, because of the increasing density, the sewage in the water is heavily accumulated. There were various outbreaks of shrimp disease and they ended up losing money.
The culture of South American white shrimp should completely abandon the traditional mode of "watching the sky and eating" and introduce the concept of circulating aquaculture. Recirculating aquaculture is through filtration, bacteria control, reasonable bacteria culture, scientific algal culture, biological filtration, constant temperature, high efficiency oxygen and other equipment. Let the water come alive. The temperature, dissolved oxygen, pH, hardness, alkalinity and other indexes of the water reach the level needed by shrimp. At the same time, through the treatment of these recirculating aquaculture equipment, so that ammonia nitrogen, nitrite and other harmful substances are separated from the water in the first time. While maintaining the vitality of the water body, it can prevent the occurrence of various diseases. Only in this way can the risks of shrimp farming be greatly reduced.

In addition, the concept of bioflocculating shrimp has also been put forward by many people. The harmful substances in the water can be transformed into the bacteria itself through the cultivation of large quantities of bacteria in the aquaculture pond. The main component of the bacteria itself is protein, and these bacteria can also be eaten by shrimp. The protein is again converted into valuable shrimp. In this way, it not only plays the role of purifying water quality, but also can improve the utilization rate of feed protein. However, in practice, due to the high density of flocs in water, various microbial groups exist in water. The difficulty of water treatment is relatively high. Once the operation is careless, it may cause more serious deterioration of water quality. Therefore, there are few successful cases of bioflocs cultivation at present. In fact, bioflocs serve the same purpose as recirculating aquaculture, but they are treated in different ways. The cost of bioflocs is relatively low, but the risks they face are also higher.
mandarin fish feed
With the recent two years, domestication technology of forage mandarin fish has been breakthrough. This noble fish is finally ready for mass marketing. But at present on the market, domesticated feed, fry market, and rise. The effects of domestication need to be looked at again. Had better be breeding farmer himself undertakes grope to small seedling acclimation technology. Some feedstock factories with a keen sense of smell have developed feedstock suitable for recirculating aquaculture of mandarin fish. Because some habits of mandarin fish, especially their eating habits, are quite unique, and their requirements for water quality are relatively high. Therefore, the recirculating aquaculture of forage mandarin fish can be carried out after the technology, seedlings, feed and other links have a technical basis, so as to ensure the success rate.

Through the recirculating aquaculture system equipment, can make the water quality to achieve a better level. In order to increase the breeding density. Add in the mandarin fish and the profit margin is not bad. In operation, we should pay attention to the wrong peak seedling, wrong peak sales. The breeding cycle and market price should be evaluated before breeding. If the pace is good, such as commodity fish specifications down when the market price is the best time, the economic benefit is very good.
Crispy meat tilapia
A new variety that has been developed in the past two years. On the basis of the original tilapia, through feed technology, the fish Q elastic crisp, taste good. And tilapia itself is not difficult to raise, it is not high requirements for water quality and other environmental requirements. So it is a very potential breed.
Common tilapia because of soil pond breeding, there is a strong smell of earth, so that its taste is greatly reduced. Prices have also been low. Under the conditions of recirculating aquaculture, the water is basically not in contact with the soil, and the fish will not have a fishy smell, and the special feed for crispy meat tilapia is added. The price has a great advantage. You can completely distance yourself from the common tilapia.

The biggest selling point of crispy meat tilapia is its strong market recognition in southern China, especially in Guangdong province. The uniqueness of its meat quality can satisfy the picky taste buds of "Lao Guang" people, and fewer people currently breed it. The market prospect is promising.
Australian freshwater lobster
This is a shrimp with a high appeal. In recent years, there has been a huge increase in the area of farming across the country. The price has been above 60 yuan per kilogram. In addition, it has a low incidence and a wide range of feed sources. So many people flock to it. At present, it is mainly soil pond breeding. Water quality can be adjusted by planting g RASs and so on. It also does a good job of cross-selling the crayfish market. As long as the output is good, the overall economic benefits are quite good. It is a kind of aquaculture species worth popularizing in a large area.
But the Australian lobster industry has its share of problems. Such as the market, has always been a relatively high-end hotel market, the ordinary aquatic market is not very good, mainly the price is too high crayfish. However, the development of high-end markets such as hotels requires certain channel costs and time costs. So. Overall sales have been modest.
Another factor is raising seedlings. Australian freshwater lobster has not been widely promoted, the biggest restriction factor is the low success rate of breeding. Not only is the amount of eggs low, but if the water treatment is not good during the seedling period, the eggs will become moldy and the prawn-friendly eggs will be kicked. Lead to the final seedling success rate is low. Blue Ling aquatic science and technology after years of contact with the first line farmers. We have designed a scientific, reasonable and affordable water treatment system for Australian freshwater lobster seedlings. It can greatly improve the breeding success rate of Australian freshwater lobster.

In addition to the above key factors, farmers in the release of seedlings, water quality regulation also have a lot of knowledge to learn. If many people put 10,000 seedlings, the final harvest of adult shrimp but only one thousand. In fact, in many cases, the water quality conditions of the seedling field and the water quality conditions of the farm are very different. In addition, Australian freshwater lobsters are prone to cannibalism when they withdraw their shells. Therefore, a thorough understanding of breeding technology is the basis of improving the success rate of breeding.
California perch
The California perch has been greatly promoted in recent years. Most of the corresponding seedling fields are distributed in Guangdong. Because Guangdong is blessed with unique conditions. The seedlings can be marked for sale before the Spring Festival. At the same time, the domestication and feed of California perch have matured. Current, the place such as guangdong, guangxi, hainan, yunnan, of California perch breed enthusiasm very high, consumer market is basically also by approbation. Because the meat of the California bass itself is delicious, so the price is not bad. But for a variety of reasons, prices at the mouth of California perch ponds were not high in 2018. But after all the costs, there is a profit.
In 2019, it's been an outbreak year for California perch. The price once reached 20 yuan per catty. And in the South China Sea and other places in Guangdong, the density of soil ponds can reach 8,000 jin per mu. According to the price of the pond head in June 2019, the profit of an acre of California perch can reach about 80,000 yuan. The economic benefits are considerable

If recirculating aquaculture is used to raise California perch, it can be done in "light mode". That is, a small amount of equipment can be invested in the original pond for appropriate transformation. For example, build some film greenhouses on the original soil ponds, and add some simple water treatment equipment, such as micro filter, aeration equipment and so on. Filtering the fish excrement in the aquaculture water. This can greatly increase the breeding density, but also easy to carry out peak cross-selling. To maximize the benefits of breeding.
A crab
Every Mid-Autumn Festival, crab is a web celebrity level of aquatic species. In recent years, information about the use of boxes to raise crabs has been overwhelming. But success stories are rare. The main reason is that most people who want to raise crabs in boxes don't understand the key point of keeping crabs in boxes. For example, in some places, at the end of 2018, the price of more than eight sizes of blue crab reached 260 yuan per kilogram. Some people can buy crabs of 4 sizes around October and sell them at the end of the year to make a small profit. So, if you want to use a box to raise crabs from infancy to adulthood, it is not a realistic idea.
Another aspect is water treatment technology. At present, the box crab, most people will encounter high nitrite situation. But the product that market goes up nitrite, the effect is often unsatisfactory. A large number of crabs died of poisoning in the later period of temporary cultivation. In view of this situation, Blue Lingtong after many years of exploration, has developed and applied a special product to remove nitrite. The results show a very significant effect in the high density circulating aquaculture. But as many people have been misled by false claims of poor technology, few people are still making money from box crab farming. A large number of equipment has been left idle after breeding failed.

Recirculating aquaculture is a very professional thing. Generally speaking, early investment is larger. Be sure to understand the technology and then invest. At present, Lanling Aquaculture technology has made qualitative breakthroughs in the core technologies of recirculating aquaculture, such as overall design of recirculating aquaculture system, cost control and biological treatment technology. Self-built high-density recirculating aquaculture farms are already under construction. Let's look forward to a truly profitable model for circulating water.

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