Safe ecological multi-layer aquaculture net cage

Abstract

The invention discloses a safe ecological multi-layer aquaculture net cage. The safe ecological multi-layer aquaculture net cage comprises an inner layer net cage 1, a middle layer net cage 2 and an outer layer net cage 3, wherein the inner layer net cage 1, the middle layer net cage 2 and the outer layer net cage 3 are all a cage body with an upper opening, and the cage body is composed of a cage type frame 4 and a netting 5 with edges fixed onto the cage type frame 4, the middle layer net cage 2 and the outer layer net cage 3 are connected through nylon cords, the middle layer net cage 2 and the inner layer net cage 1 are also connected through nylon cords, the upper surface of the outer layer net cage 3 is provided with a pedestrian plate 6, buoyant devices are arranged under the pedestrian plate 6, and bait stages 8 are arranged inside both the inner layer net cage 1 and the middle layer net cage 2. The safe ecological multi-layer aquaculture net cage has the advantages that aquaculture species are increased, the economic benefits of aquaculture are significantly improved; aquaculture modes of different areas are more ecological and environmentally friendly; the safe ecological multi-layer aquaculture net cage not only facilitates management and maintenance work of workers, but also is long in service life and is not easy to be corroded.

Description

Technical field [0001] The invention belongs to the field of aquaculture, and specifically relates to a cage for aquaculture, particularly a safe and ecological multi-layer aquaculture cage. Background technique [0002] According to historical records, China has used dense mesh cages to temporarily raise fish fry collected from rivers about 800 years ago. The temporary breeding time is about 15-30 days, waiting for sale. This can be regarded as the prototype of cage culture, but the real Cage fish culture in the sense started in 1973. The purpose is to use the primary producers (phytoplankton) who built the reservoir to set up cages to cultivate large-size silver carp and bighead carp species over 13 cm, and then stock them in the reservoir. To improve the survival rate of fish species in reservoirs, this intensive aquaculture model soon succeeded and was quickly promoted. China's cage aquaculture started relatively late, but it is an important way for the development of reservo...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201595082U discloses a multi-layer three-dimensional breeding net cage, which includes a frame made of wooden boards and a net of box-type structure. The frame floats on the water surface through a float at the bottom, and the upper opening of the net is fixed on the frame. , there are sinkers fixed on the bottom edge of the net and on the edges around the net, so that the bottom of the net sinks and is opened as a whole. The net is provided with three layers, and the float is a foam with a density less than water or a sealed empty bucket. The device can allow different fish to live in the most suitable water layer, and can reduce the waste of fish food when feeding. It has the advantages of low environmental pollution, high survival rate of breeding, and strong resistance to natural disasters. Wooden boards are used to construct the buoyancy and support structure of the cage. This structure has a short service life and is susceptible to corrosion, which will pose a greater threat to the safety of the cage and staff;

Although it expands the breeding volume, but because generally only one kind of fish can be cultured in a cage, and the fish generally live in a fixed water layer, the increase of the height of the cage has little significance for the change of the living space of the fish.

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