Ecological shrimp farming in high-level ponds, zero discharge of tail water

"Shrimp cultured with probiotics + circulating water tastes fresh and sweet, like wild." On March 15, in Renshan Town, Huidong County, Huizhou City, Guangdong Bigao Biotechnology Co., Ltd.'s breeding base, the company's general manager Manager Gao Zhanyuan pointed to the shrimps thrown up by the shrimp pond and told the "Ocean and Fisheries" reporter that through the use of microbial purification technology, this high-level pond shrimp breeding base has achieved zero discharge of tail water, and it is currently the only one in Huizhou that has no tail water discharge. The high-level pond ecological circulation breeding base in the mouth.
 
In May last year, Guangdong Bigao Biotechnology Co., Ltd. and the Municipal Fisheries Research and Promotion Center, a public institution affiliated to the Huizhou Agriculture and Rural Bureau, jointly carried out "antibiotic-free, odorless, zero tailwater discharge" probiotic ecological breeding in the breeding base of Renshan Town. test. At present, three kinds of breeding have been tested. Among them, the first experimental breeding is to raise P. monodon, with a per mu yield of 6,000 catties and a harvest size of 37-40 heads/catties. The currently cultivated species is Penaeus vannamei, and the seedling time is mid-to-late January. Although the weather is hot and cold in February and March, the shrimp are growing well. The reporter saw at the scene that the shrimp was already the size of a little finger, and it is expected that the shrimp will be released one after another in mid-April.
 

▲ Prawns
 
"Bacteria" cultivation + microbial purification,
 
Realize the recycling of aquaculture tail water
 
This base has a total breeding area of ​​20 mu, and has set up 15 breeding ponds of different specifications, with a seedling density of 360,000/mu. The reporter saw at the scene that the aquaculture water in the pond was oily green, the water color was relatively transparent, and there was no obvious odor in the winter shed. "Shrimp farming requires water, and the quality of water quality directly affects the growth and survival rate of shrimp." Gao Zhanyuan said that when the water is clear, there will be no fish. The water for shrimp farming must cultivate a good algal phase to provide shrimp with Biological bait, but the premise is that the problem of algae aging and shrimp feed residue and shrimp excrement must be solved. The previous practice was that after the algae were aged, they were killed and discharged by chemical substances, and then the water body was disinfected, detoxified, and algae cultivated. In the breeding base, Bigao adopts the "bacterial phase" breeding technology, that is, the self-developed probiotics continue to treat the breeding water, so that the feed residues and shrimp excrement in the water can be decomposed and utilized by probiotics, ensuring that The bacteria in the water are dominated by probiotics, which realizes the dynamic balance of the bacterial phase and the algal phase in the aquaculture water. The problem is solved, and the aquaculture water quality is excellent and stable. Anti-, odorless, ecological breeding effect.
 
Through the use of microbial purification treatment, the base has realized the recycling of aquaculture tail water. It is reported that the base implements four-level treatment of tail water. After the aquaculture tail water is discharged into the collection tank, the sewage is first disinfected with bleaching powder and spectral bactericide; and then the ammonia nitrogen and organic load of the water body are reduced through microbial treatment technology. Gao Zhanyuan explained that the biotransformation of organic substances in water by adding functional microorganisms from external sources can quickly reduce the content of ammonia nitrogen, nitrite and hydrogen sulfide in the water; after precipitation, the aquaculture tail water enters the biological purification tank and is put into Probiotics further treat the water body. After the aquaculture tail water has been treated to meet the standard, it is returned to the reservoir for use as aquaculture pond water. By continuously circulating water and discharging tail water, the ammonia nitrogen concentration in the water body is reduced, and fresh water is allowed to continuously enter the aquaculture pond.