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Recirculating prawn aquaculture method in combination with nitrification-assimilation effect

A technology of recirculating aquaculture and assimilation, applied in the direction of chemical instruments and methods, applications, fish farming, etc., can solve the problems of high energy consumption in system operation, low economic benefits, low success rate of recirculating aquaculture, etc., and achieve improved treatment Efficiency, reduction of water circulation rate, and the effect of inhibiting some potential pathogens of Flavobacteriaceae

Inactive Publication Date: 2019-12-03
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a combined nitrification-assimilation prawn recirculating aquaculture method to solve the problems of low success rate of existing recirculating aquaculture, high energy consumption for system operation, and low economic benefits

Method used

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  • Recirculating prawn aquaculture method in combination with nitrification-assimilation effect
  • Recirculating prawn aquaculture method in combination with nitrification-assimilation effect

Examples

Experimental program
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Embodiment 1

[0021] Farming systems such as figure 1 As shown, there are 6 breeding ponds with a size of 6.5×6.5m and a water depth of 0.9m; the cultivation ponds are cone-shaped and low, with a slope of 1 / 15~1 / 20, and the central sewage discharge pipe is shared with the circulating return water pipe;

[0022] Crawler-type microfilter, screen size 120 mesh, automatic backwashing according to liquid level difference; water circulation pump flow speed 25-30m 3 / h, the aquaculture pond water body circulates 2 to 3 times per day; the size of the biological filter is 7.45×3.0×2.6m, filled with elastic brush biological filter material, the filling rate is 50%, the biofilm is cultivated in advance before the system starts, and the nitrification system is constructed; The rated power of the sterilization device is 2.4kw, and the operating power is divided into four levels; the power of the inflatable Roots blower in the breeding pond is 3kw, and the nanotubes are arranged around the breeding pond and f...

Embodiment 2

[0026] The breeding system and management are the same as in Example 1. No carbon source is added during the breeding process, and the water quality is controlled by the nitrification of the biological filter and the physical filtration method. The system is operating well in the early stage of aquaculture, and the concentration of ammonia nitrogen and nitrite is controlled below 0.5mg / L; however, with the growth of prawns, the amount of feed is greatly increased, and the water treatment load of the system increases, and the ammonia nitrogen and nitrous acid in the later stage of aquaculture The salt concentration gradually increased, the concentration of ammonia nitrogen reached 3.1mg / L and the concentration of nitrite reached 5.4mg / L at the end of aquaculture, threatening the healthy cultivation of prawns. After 65 days, the prawn farming load is 2.8kg / m 2 .

Embodiment 3

[0028] The breeding system and management are the same as in Example 1. No carbon source is added during the breeding process, and the breeding water environment is regulated by increasing the system water circulation and strengthening the nitrification of the biological filter. The system water circulation rate is 10-15 times / day. During the breeding process, water quality indicators such as ammonia nitrogen and nitrite are well controlled and the aquaculture water is clear, but it is not suitable for Litopenaeus vannamei breeding. The diversity of colony in the aquaculture water is low. In the structure of the colony, the Pseudoalteromonas family accounts for 32.63% of the total number of bacteria, Colwell's family accounts for 26.24% of the total number of bacteria, and Alteromonas family accounts for the total number of bacteria. Rhodobacteraceae, which has more beneficial bacteria, did not form a dominant position, accounting for only 15.63% of the total bacterial count. Th...

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Abstract

The invention relates to a recirculating prawn aquaculture method in combination with a nitrification-assimilation effect and belongs to the technical field of aquaculture. A culture system used in the method comprises a culture pond, a microfilter, a water circulating pump, a biofilter, an ultraviolet sterilization device and a Roots blower; when the culture system is utilized for culture, browngranulated sugar 40-50% of the bait feeding amount or molasses 50-60% of the bait feeding amount is added into the culture pond every day to promote growth of heterotrophic bacteria, and part of metabolic waste is removed by utilizing the bacterial assimilation effect. According to the method, in the circulating water culture system with nitrification as a water treatment core, a carbon source iscontinuously increased in the culture process, growth of the rhodobacteriaceae bacteria in a culture water body is promoted, the bacterial assimilation effect is strengthened, meanwhile, the nitrification effect of nitrification bacteria is not inhibited, the assimilation effect and the nitrification effect jointly purify the water body, the microbial water treatment efficiency is improved, the load of a water treatment system is reduced, and a culture water environment is improved.

Description

Technical field [0001] The invention belongs to the technical field of aquaculture, and specifically relates to a method for cyclic aquaculture of shrimp with combined nitrification-assimilation. Background technique [0002] Litopenaeus vannamei is one of the three major shrimp culture species in the world. It has the advantages of fast growth, strong environmental adaptability, and long survival time out of water. In 2018, the marine production of Litopenaeus vannamei was 1.118 million tons, reaching a crustacean 65.6% of mariculture production. Affected by the deterioration of the ecological environment and the excessively high breeding density, the shrimp aquaculture industry is facing many environmental pressures. It is not affected by adverse factors such as seasons and weather. The environmentally controllable factory farming model is increasingly favored by the industry, especially in my country In the north, the factory farming model of shrimp has developed to a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/59A01K63/04C02F3/34
CPCA01K61/59A01K63/04A01K63/045C02F3/34Y02A40/81
Inventor 李健陈钊刘云锋刘寿堂葛红星陈世波
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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