Cultured green prawns have the advantages of low seed use, strong fertility, low cost, low risk, and high benefits. In general, every 667 m2 (1 mu) can be hovered by about 0.5 kg with oviposition shrimp. Under the conditions of clear ponds and wild fish are forbidden to enter the pool, scientific and scientific feeding management will be conducted. Every 667m2 can produce 50-75 kilograms of shrimp. However, at present, many shrimp farmers, especially some new farmers, often blindly cast seeds, seriously affecting the quality and economic benefits of adult shrimp production.
There are three major problems with overdose of seed: First, because of the strong fertility of the shrimp, one female can produce about 3,000 shrimp. These shrimps also have to breed a new generation of shrimp around September of that year. If they do not control their use, they will overproduce. The second reason is that shrimps are very resistant to hypoxia. If they are used in excessive quantities and their density is too high, they will be exposed to sultry thunderstorms, which will easily lead to lack of oxygen and pan dead shrimp. In severe cases, the entire army will be destroyed. The third is to invest too much seed, which will lead to dense populations and very small farm specifications. Not only will they not be able to sell at good prices, but the amount of shrimp that comes on the market will also be small. The price of a typical small size (2 to 3 cm) shrimp is 1/5 of that of a large format shrimp.
To this end, the relevant shrimp farmers are reminded to pay attention to the following three points: First, the seeds must not be exceeded. For example, shrimps of 2 to 3 cm in size from March to April should not exceed 500 g (150 to 200) per 667 m2. The second is that if you put eggs in the end of May and early June, do not exceed 100 to 150, and the male to female ratio is 3:1. The third is that if shrimps were put into production in July, there would be more than 15,000 shrimps per 667 m2. In order to control overproducing, it is better to put 30 to 50 carnivorous fish (preferably carp) every 667 m 2 in September. This can promote the increase of groups, improve the quality of specifications, and sell good prices.
(Ma Youfa, Fishery Technology Promotion Station, Funan Township, Rudong County, Jiangsu Province Postcode: 226403)