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One casting of seedlings, multiple fishing
Has always been the mode of four large fish mixed culture in many places in Hubei. At present, the local South American white shrimp farming is mainly fish and shrimp mixed mode, mainly mixed bighead carp, crucian carp, grass carp, silver carp and so on. The general culture cycle is about one year, first fish and then shrimp. Shrimp farming 3 to 4 months, a one-time seedling, many times to catch shrimp, catch the shrimp before starting to fish.
Zhou Jinghuai's breeding mode is: shrimp fry density of 90,000 to 100,000 tails / mu. Carp density of 1,000 to 2,000 / mu (specifications for 1,200 to 2,000 / kg), grass carp density of 20 / mu (specifications for 1 to 2 / kg), silver carp density of 500 to 1,000 / mu (specifications for 600 to 1,000 / kg), bighead carp density of 50 / mu (specifications for 6 to 20 / kg), every 2 acres of fish ponds configured with an oxygenator 1 unit. The density of bighead carp, silver carp and silver carp is 50 fish/mu (6-20 fish/kg). Among them, crucian carp, bighead carp, bighead carp in March each year to start casting; shrimp fry in May to start releasing; grass carp in the casting of shrimp fry in 20-30 days after the start of the pond. South American white shrimp breeding time is 3 to 4 months, before the Spring Festival after the fish dry pond.
The stocking of grass carp in fish ponds is mainly for the prevention of disease, because through the grass carp to eat dead shrimp, sick shrimp, weak shrimp, can effectively control disease, but can not stock too much grass carp. It is also because the grass carp will eat shrimp, so farmers should pay attention to the grass carp can not be placed at the same time with the shrimp fry, you must wait for about a month after the shrimp fry can be placed. Carp and silver carp are stocked to increase production value, while bighead carp are stocked to play the role of living water, water stabilization, because the bighead carp has a "scavenger in the water," said.
While Zhou Jinghuai has adopted a mixed model of fish and shrimp, the profit mainly comes from the production of shrimp. According to Zhou Jinghuai introduction, the general shrimp fry breeding 70 days after the start of shrimp, local cages out of shrimp-based, to meet the listing specifications every day out of shrimp, a pond shrimp farming down, out of shrimp at least 30 times, the mu output of 300 to 400 kilograms of crucian carp mu output of 400 to 500 kilograms of other fish add up to 300 kilograms / mu. Among them, the profit of shrimp is about 5,000 yuan, the profit of fish is about 2,000 yuan, the average mu profit is 7,000 yuan.
Zhou Jinghuai used to breed second-generation shrimp seedlings, are air-freighted from the city of Beihai, Guangxi, and then in practice he found that the second-generation seedling growth rate is not fast, and the survival rate is not high, and in 2013, he began to switch to put a generation of seedlings. It is understood that the growth rate of the generation of seedlings he bought is indeed much faster, and the survival rate is relatively high. He pointed out that before farmers are ready to put shrimp seedlings, regardless of the selection of a generation of seedlings or second-generation seedlings, buy back the shrimp seedlings must all go through the desalination, marking roughness after two steps before breeding. And in these two aspects, he did better. At the same time, in the constant search for practice, he summed up a set of high-yield and efficient shrimp farming new technology - mesh box desalination, small pond marked rough mode. Specifically as follows:
Net box desalination
In desalination of shrimp seedlings, Zhou Jinghuai has been very handy. One of his secrets lies in the return of air-freighted seedlings, he must wait 1 to 2 days before the start of desalination, so that the shrimp seedlings first buffer, he said a lot of farmers in a hurry, shrimp seedlings air-freighted back to the immediate desalination, and desalination speed, resulting in shrimp seedling desalination of the success rate is low. Generally air-freighted back to the shrimp fry, with a salinometer to measure its salinity, the salinometer shows a reading of 14 grams, need to be placed in the net box desalination, when the salinometer readings show -2 grams in order to mark the coarse. Generally this process takes 10 to 15 days. Zhou Jinghuai desalination of shrimp fry began to desalinate 1 to 2 frames per day (salinometer reading); when the salinity desalination to the salinometer reading shows 5 frames, and then can only be desalinated 1 frame per day (salinometer reading).
Zhou Jinghuai stressed that desalination of shrimp seedlings must have patience, but also need to master the trace elements of seawater, and add water desalination of water sources must be in addition to impurities, sterilization and disinfection, cultivation of algae cultivation of bacteria, etc. to adjust the quality of water before use.
Shrimp seedlings desalination, the next step is to put into a small pond marked rough.
Small pond rough
Small pond rough can improve the survival rate of shrimp seedlings. The area of the small pond is preferably no more than 5% of the pond area, a one-time desalination of the seedling into the small pond, such as 5 acres of shrimp ponds, Zhou Huaiging generally put about 400,000 shrimp seedlings, the final breeding density of 50,000 to 60,000 tails / acre, the shrimp seedling survival rate of up to more than 6%.
In the process of labeling seedlings, daily inspection is required, after 15 to 20 days, when the shrimp seedlings labeled thick to the body length of 2.5 cm or so, can be put into a large pond culture. From the net box desalination to the small pond marked thick, it takes 30 to 40 days, although it takes more time, but the survival rate is very high, the results are good.
Zhou Jinghuai has been insisting that the shrimp fry desalination and labeling rough, such persistence also brought him a better economic income.