Method for improving breeding effect of large yellow croaker by using biological flocculation technology

Abstract

The invention provides a method for improving a breeding effect of a large yellow croaker by using a biological flocculation technology. The method comprises the steps: breeding a hatched large yellow croaker fry to be 20 days old; adding a seawater washing solution for screening and washing fine loess after adding a feed into a breeding pond every day, and regulating the transparency of water in the breeding pond to be 10cm deep; adding activated Bacillus cereus and photosynthetic bacteria as well as a biological flocculation culture solution according to the age in days of the large yellow croaker; and keeping the temperature inside the breeding pond at 24-26 DEG C, sucking pollutants at the bottom of the breeding pond every day, and replenishing water lost by pollutant suction. Compared with a common breeding technology, the method has the advantages that a small deal of water is changed in the whole process, no heated seawater is wasted, wastes discharged to the outside can be reduced by 55-70%, the fuel cost can be reduced by 80% or above, the water pumping electricity cost can be reduced by 70% or above, the manpower costs for pollutant suction, water change and boiler heating can be reduced by 40% or above, the breeding survival rate can be increased by 17-23%, and no antibiotics are used in the whole breeding process.

Description

technical field [0001] The invention relates to a large yellow croaker seedling raising method, in particular to a method for improving the large yellow croaker seedling raising effect by using biofloc technology. Background technique [0002] At present, large yellow croaker seedlings are mainly raised in spring. Before and after the Spring Festival, when the water temperature in the sea area is 10-13°C, the temperature of the seawater is increased to about 25°C through boilers for artificial seedling cultivation. Since the high-density nursery mode is adopted, the water quality can only be maintained by a large number of water changes. The water exchange volume of the nursery pool exceeds 100% every day. Pollution to nearby sea areas. In the later stage of the high-density seedling breeding mode, due to the large amount of feeding, harmful bacteria are easy to breed, and antibiotics are often required. Incidents of seedling drug residues exceeding the standard occur from...

AI Technical Summary

Problems solved by technology

Since the high-density nursery mode is adopted, the water quality can only be maintained by a large number of water changes. The water exchange volume of the nursery pool exceeds 100% every day. Pollution of nearby sea areas

In the late stage of high-density seedling breeding mode, due to the large amount of feeding, harmful bacteria are easy to breed, and antibiotics are often required. Incidents of seedling drug residues exceeding the standard occur from time to time, which has become an important bottleneck affecting the healthy development of the seedling industry.