Device and method for lifting seabed nutritive salt of shellfish buoyant raft culture area

Abstract

The invention discloses a device and method for lifting seabed nutritive salt in a shellfish buoyant raft culture area. A shellfish buoyant raft comprises a buoyant raft and a limiting cable connected between the seabed and the buoyant raft. The device for lifting the seabed nutritive salt in the shellfish buoyant raft culture area comprises a bottom raft arranged on a seabed, a plurality of sets of injection pipes are fixedly arranged on the bottom raft, and a plurality of nozzles are formed in each set of injection pipes; and the injection pipes communicate with an air guide pipe, and the air guide pipe is connected with an upper pressurization mechanism and a lower pressurization mechanism. The upper pressurization mechanism and the lower pressurization mechanism are used for guiding air above the sea surface into the seabed to provide power for the air guide pipe, an air curtain is formed, upward flow is generated in the raft type culture area, bottom water with the high nutritive salt content is lifted to the surface layer for growth of bait microalgae, the abundance of the bait microalgae in the culture area is increased, the primary productivity of the raft area is improved, the survival rate and the yield of the raft culture shellfish are further improved, meanwhile, dissolved oxygen in the surface water body can be increased, and the effect of optimizing the seawater environment of the culture area is further achieved.

Description

technical field [0001] The invention mainly relates to the technical field of shellfish culture equipment, and can be widely used in lifting bottom seawater to the surface layer to increase nutrient salts in the surface water body. Here, it particularly relates to a device and method for raising seabed nutrient salts in shellfish floating raft culture areas. Background technique [0002] Appropriate development of shallow sea shellfish farming can not only provide a large amount of high-quality seafood for human beings, but also effectively control marine eutrophication and prevent red tides. It has significant ecological and environmental benefits and is a win-win human production activity. At present, shellfish culture methods mainly include bottom sowing culture, stake culture, long-line culture, fixed frame culture and raft culture; with the development of offshore raft culture, the scale of shallow sea raft culture in my country continues to expand , large-scale aquacult...

AI Technical Summary

Problems solved by technology

At present, shellfish culture methods mainly include bottom sowing culture, stake culture, long-line culture, fixed frame culture and raft culture; with the development of offshore raft culture, the scale of shallow sea raft culture in my country continues to expand , large-scale aquaculture rafts appeared on the sea surface, and the spatial arrangement of the entire raft had a certain impact on the hydrodynamic exchange performance of the water body in the aquaculture area, changing the hydrodynamic characteristics of the aquaculture area and adjacent sea areas. At the same time, It also weakens the ability of material transport and diffusion in the sea area

[0003] Shellfish bait includes natural zooplankton, unicellular algae, etc. The traditional farming method uses natural zooplankton and unicellular algae in seawater as basic bait, but this method can no longer meet the normal growth needs of shellfish

In recent years, shellfish culture has shown that the shellfish located on the outermost sides of the raft area grow well, while the shellfish in the middle raft area grow poorly, and even stagnate or die on a large scale. The main external cause of large-scale death is the lack of bait "starvation". The reason is that the hydrodynamic conditions in the breeding area are limited by the influence of the raft, which hinders the smoothness of nutrient and bait transportation, resulting in marine microalgae and natural zooplankton in seawater. The organic matter and nutrient salts needed for growth and reproduction are lacking, and the bait supply of shellfish is low, resulting in the mass death of rafted shellfish; while organic matter and nutrient salts are often located on the seabed, and deep waters are affected by thermoclines and haloclines. , the seabed nutrients are difficult to transport to the euphotic layer of the sea surface, resulting in insufficient bait for marine microalgae and natural zooplankton in seawater

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