Method for reducing feed coefficient of Tilapia mossambica through adding carbon source in culture water

Abstract

The invention relates to a method for reducing feed coefficient of Tilapia mossambica through adding a carbon source in culture water. According to the method, spreading starch accounting for 25%-35% of the overall feeding quantity of a day once a day within one hour after feeding. The invention also relates to application of starch for reducing feed coefficient of Tilapia mossambica. The method has the advantages that starch is added to the culture water of Tilapia mossambica to provide an organic carbon source for heterotrophicy bacteria in the culture water so that the heterotrophicy bacteria can use ammonia nitrogen in the water and the added starch to generate new bacterioproteins, therefore water quality is improved, water changing frequency is reduced, and dependence on the water resources during the culture process is lowered; in addition, the generated floc can be ate by Tilapia mossambica, therefore the feed utilization is improved, feeding quantity is lowered and demands on fish meal and fish oil serving as sources of proteins in the production process of feed can be reduced. The method has remarkable ecological effect, is an effective and sustainable culture way, is simple to operate and is suitable for wide popularization.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to a method for reducing the bait coefficient of tilapia by adding carbon sources in aquaculture water. Background technique [0002] Tilapia is one of the main species of freshwater aquaculture in my country, mainly concentrated in Guangdong, Hainan and Fujian provinces. According to statistics, the national tilapia production in 2009 was as high as 1.258 million tons, accounting for 6.43% of China's total freshwater fish production. It is mainly exported to Europe, America and other countries, and the market demand is increasing day by day. But at present, the tilapia aquaculture production in my country is basically based on still water and non-sewage ponds. The activities, feeding and excretion of cultured fish are all carried out in the same pond. Under normal circumstances, farmed fish can only digest and absorb 20%-25% of the protein in the bait fed, and the rest exists ...

AI Technical Summary

Problems solved by technology

Under normal circumstances, farmed fish can only digest and absorb 20%-25% of the protein in the bait fed, and the rest exists in the aquaculture water environment in the form of ammonia nitrogen, residual bait and feces, which can easily cause water quality deterioration and induce fish diseases even lead to mass fish kills

For ammonia nitrogen, residual bait and feces in the water body, one treatment method is to change the water, which will consume a lot of water resources. At present, most areas in my country lack water resources, which limits the development of tilapia aquaculture to a certain extent.

The second method is to treat the water for breeding and then reuse it, that is, recirculating aquaculture, but this model will increase investment and operating costs, and it is not very practical for tilapia farming in my country

However, there is no report on the application of microbial flocculation technology in tilapia farming.