Method for thickening offspring seeds of giant freshwater prawns by using double-layer greenhouse

Abstract

The invention discloses a method for thickening offspring seeds of giant freshwater prawns by using a double-layer greenhouse. According to the method for thickening the offspring seeds of the giant freshwater prawns by using the double-layer greenhouse, by means that a double-layer greenhouse culture environment is constructed, a stocking intensity is reasonably set up, a seed water allocation pond is constructed, a bottom blow-down device is set up, water is exchanged appropriately every day, early seed dwelling sites are increased, and the like, the thickening rate of early seeds can be greatly increased; and meanwhile, through the heat-preservation effect of the double-layer greenhouse, heat energy consumption can be reduced, and the thickening cost can be reduced. Testing shows that by adopting the thickening method disclosed by the invention, the survival rate of the offspring seeds of the giant freshwater prawns can be increased by 50-80%, and the culture energy consumption costcan be reduced by 35-45%.

Description

technical field [0001] The invention relates to the technical field of aquaculture, [0002] In particular, the present invention relates to a method for carrying out seed marking of Macrobrachium rosenbergii by using a double-layer greenhouse. Background technique [0003] Macrobrachium rosenbergii, also known as Malaysian prawns and freshwater long-armed prawns, is a freshwater prawn native to Southeast Asia. It has the advantages of fast growth, wide appetite, good meat nutrition, and short breeding cycle. my country introduced it in 1976, and started large-scale seedling breeding and breeding in 2002. After more than 40 years of development, the current breeding area has exceeded 600,000 mu. The main breeding areas are Guangdong, Jiangsu, Shanghai, Zhejiang, Guangdong, Guangxi, Fujian and other provinces , and has expanded to Hunan, Hubei, Shandong, Hebei and other provinces. [0004] However, during the breeding process in recent years, the low survival rate of early ...

AI Technical Summary

Problems solved by technology

[0004] However, during the breeding process in recent years, the low survival rate of early seedlings and high heating costs have become one of the important factors restricting the development of the industry from the end of January to the beginning of March every year

After tracking and monitoring, it was found that the reasons for the mass death of seedlings during the rough marking process mainly include the following aspects: 1) The stocking density is unreasonable

Some farmers blindly pursue the quantity during the early seedling cultivation process, and the stocking density exceeds the carrying capacity of the water body, resulting in a high mortality rate of the seedlings during the roughing process, which increases the probability of "iron shrimp". Taking 2019 as an example, After follow-up investigation, the survival rate of standard roughage is generally 30%-40%, which not only causes waste of high-quality seedlings, but also greatly increases the entire breeding cost, which affects the breeding efficiency; 2) Poor management of water quality in the rough standardization process

After tracking and testing, it was found that the farmers with a low survival rate of early seedling standardization generally suffered from water quality deterioration during the process of standardizing seedlings. In the middle and late stages, the ammonia nitrogen was generally between 1.18 mg / L and 1.56 mg / L, and the nitrite nitrogen was In the range of 0.24 mg / L-0.57 mg / L, the deterioration of water quality will not only lead to the reduction of seedling feeding and the increase of residual bait, which will further aggravate the deterioration of water quality, but will also affect the shelling growth of M. 3) Due to the lack of living space, the seedlings fight or cannibalize each other seriously, resulting in a high disability rate or mortality rate of the standard seedlings, which seriously affects the effect of the standard seedlings

In addition to the increase in the cost of seedlings, the reason for the high cost of roughing is also directly related to the poor heat preservation effect of the heating system and high energy consumption during the roughing process.