Composite prawn farming system based on ex-situ biofloc cultivation and in-situ nitrification

Abstract

The invention discloses a composite prawn farming system based on ex-situ biofloc cultivation and in-situ nitrification, mainly comprising a prawn farming pond, a juvenile cultivation pond, a settlingpond, a denitrification pond, a fluidized bed and a microcomputer control system. In the juvenile cultivation phase, farming tail water is mainly treated through a biofloc technique; farming water nitrogen is mainly removed in the late farming stage through in-situ nitrification and denitrification; the harmful matters, such as hydrogen sulfide, occurring in the farming process are removed by theaid of the ex-situ biofloc technique; farming oxygen dissolution risk can be controlled, zooplankton is subjected to ex-situ cultivation by means of bioflocs to feed prawns, feed utilizations rate isincreased, and nutrition is balanced for the prawns. Compared with single biofloc prawn-farming systems, the composite prawn farming system herein has the advantages that aerating energy consumptionis decreased by 30% and above, food utilization rate can be increased by 10-15%, ammonia nitrogen and nitrite concentrations can be controlled within a safety concentration range in the whole farmingprocess, the farming risk is low, and the system herein is suitable for large-scale prawn production.

Description

technical field [0001] The invention relates to a compound prawn culture system, specifically, a compound Penaeus vannamei culture system integrating the advantages of ectopic biological floc, zooplankton cultivation technology and in-situ nitrification, and belongs to the technical field of aquaculture . Background technique [0002] The biofloc culture technology of Penaeus vannamei is to keep the carbon-nitrogen ratio between 12-15 by continuously supplementing the organic carbon source in the culture water, so as to promote the growth of heterotrophic microorganisms in the culture system, and absorb the ammonia nitrogen and other metabolic wastes in the water to become bacteria. A new type of aquaculture technology based on body protein, which has the advantages of reducing feed consumption, reducing aquaculture sewage discharge, and improving the immune defense of prawns. However, most of the existing biofloc shrimp farming techniques are to cultivate biofloc in situ i...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a composite prawn farming system that integrates the advantages of ectopic cultivation of biofloc and zooplankton and in-situ nitrification, and overcomes the large energy consumption of oxygenation in the middle and later stages of a single shrimp farming system, and the ammonia nitrogen and inferior nitrogen in the water body. Problems such as high nitrate concentration, low utilization rate of biofloc, easy death of prawns, etc.

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