A net cage array suitable for deep sea farming

Abstract

The application relates to a net cage array suitable for deep-sea culture, and belongs to the technical field of aquaculture facilities. The net cage array is a square or rectangular array composed of net cages. The net cages can sink to a certain depth under the water surface. The net cages are arranged in regular rows and columns. The application arranges the net cages in an array in a regular manner, slows down the flow speed, and sinks the net cages to a certain depth to avoid the influence of extreme weather such as high temperature, so that green peacock grouper with weak swimming ability and poor tolerance to high and low temperatures can also be cultured in the deep sea.

Description

Technical Field

[0001] This invention belongs to the field of aquaculture facility technology, specifically a net cage array suitable for deep-sea aquaculture. Background Technology

[0002] In the current aquaculture field, the greenfin filefish, as a fish with high economic value, has attracted much attention regarding the development of its aquaculture technology. Traditional nearshore aquaculture models have revealed numerous serious problems over long-term practice. Nearshore aquaculture areas are relatively enclosed with weak water exchange capacity. With the continuous expansion of aquaculture scale, large amounts of uneaten feed and fish excrement accumulate on the seabed, leading to severe eutrophication. This eutrophication promotes the proliferation of seabed microorganisms, consuming large amounts of dissolved oxygen, causing a rapid deterioration of the seabed ecosystem. The living space of many benthic organisms is severely squeezed, biodiversity is significantly reduced, and the once rich and diverse seabed ecosystem becomes extremely monotonous and fragile. At the same time, the large amounts of drugs used in the aquaculture process have also caused incalculable damage to the seabed ecosystem. These drug residues spread through seawater, affecting the ecological balance of surrounding waters and posing a significant threat to the stability of the entire nearshore ecosystem.

[0003] Given the severe ecological damage caused by nearshore aquaculture, relevant policies have been strictly adjusted. Various regions have introduced policies to strictly limit large-scale aquaculture activities in nearshore areas, greatly restricting the development space of nearshore aquaculture. Aquaculture farmers urgently need to find new aquaculture areas and models. However, turning to deep-sea aquaculture presents new challenges. While deep-sea areas offer vast space and good water quality, the wind and wave conditions are extremely complex and harsh. Constantly affected by strong winds, giant waves, and ocean currents, the stability of aquaculture facilities is paramount. Ordinary aquaculture cages are easily damaged by the impact of wind and waves in such environments, causing farmed fish to escape and resulting in huge economic losses. Furthermore, the physiological characteristics of the greenfin filefish also pose challenges to its aquaculture. The greenfin filefish has relatively small fins, making its swimming ability somewhat weak. In the deep-sea aquaculture environment, large waves and currents make it difficult for the greenfin filefish to maintain its position and swimming posture, easily being swept away by the current or losing its normal physiological and swimming abilities. Moreover, due to its poor swimming ability, it also faces difficulties in foraging and cannot actively chase food like other fish with strong swimming abilities, which is extremely detrimental to its survival and growth in deep-sea aquaculture environments. Summary of the Invention

[0004] The purpose of this invention patent is to provide a net cage array suitable for deep-sea aquaculture. The method involves regularly arranging large array net cages to slow down water flow and allow the net cages to sink and avoid severe weather.

[0005] This invention is achieved using the following technical solution:

[0006] A net cage array suitable for deep-sea aquaculture, wherein the net cage array is a square or rectangular array composed of net cages, the net cages are able to float and sink to a certain depth below the water surface; the net cages are arranged in regular rows and columns;

[0007] In a preferred embodiment, the cage array includes a cage body (including a cage frame and a net), adjusting floats, connecting cables, and a horizontal fixing cable frame. The cage body is connected to the horizontal fixing cable frame via connecting cables. The adjusting floats are fixed to the cage body via retractable cables. The horizontal fixing cables include a main cable frame, side cables, fixed side cables, and floats. The fixed side cables are used to fix the cages to the seabed or other underwater fixed objects. The floats are fixed at the connection between the main cable frame and the side cables, and float on the sea surface to provide upward tension. The main cable frame is located at a certain depth underwater. The main cable frame is composed of longitudinal and transverse cables forming a square enclosure. The cage body is connected to the four corners of the main cable frame to form the square enclosure via connecting cables.

[0008] In a preferred embodiment, the main cable frame forms a square enclosure at a certain depth underwater, and the net cage can rise to the water surface or descend below the main cable frame with the main cable frame as the center.

[0009] In a preferred embodiment, the main body of the net cage can be raised or lowered by adjusting the length of the retractable rope and the connecting rope of the float, while the float floats on the sea surface.

[0010] The present invention also provides a method for culturing greenfin filefish using the aforementioned net cage array. The method involves placing strong-swimming fish or an appropriate number of large-sized greenfin filefish in the first and second rows of net cages facing the main current and in the first row of net cages in the non-main current direction after the first and second rows along the main current. The net cages located inside and behind the net cage array are used to normally cultivate greenfin filefish with a total length of more than 10 cm, with a cultivation density of 90-120 fish / cubic meter. The large-sized fish are greenfin filefish with a total length of more than 20 cm, with a cultivation density of 50-80 fish / cubic meter.

[0011] The beneficial effects of this invention compared with the prior art are as follows: This invention slows down the flow intensity by arranging the net cages in a regular array, and avoids the impact of extreme weather such as high temperature by sinking the net cages to a certain depth, so that greenfin pufferfish, which has weak swimming ability and is not tolerant of high and low temperatures, can also be farmed in the deep sea. Attached Figure Description

[0012] Figure 1 This is a top view of the 6*6 mesh cage array of the present invention;

[0013] Figure 2This is a side view of the 6*6 mesh cage array of the present invention;

[0014] Figure 3 An enlarged top view of a single fish cage;

[0015] Note: 1. Main body of the cage, 2. Adjustable float, 21. Retractable rope, 3. Connecting cable, 41. Main cable frame, 42. Side cable, 43. Fixed side cable, 44. Float, 411. Longitudinal cable, 412. Horizontal cable, 5. Anchor, 6. Sea level, 7. Seabed. Detailed Implementation

[0016] The technical solution of the present invention will be further explained below through embodiments, but the scope of protection of the present invention is not limited in any way by the embodiments.

[0017] Example 1

[0018] like Figure 1-3 As shown, a deep-sea aquaculture method suitable for greenfin pufferfish is described, the method including the deployment of net cage arrays and the release of cultured species;

[0019] The net cage array is a square or rectangular array composed of net cages. The net cages are able to float and sink to a certain depth below the water surface. The net cages are arranged in regular rows and columns.

[0020] As a preferred technical solution, the net cage in this embodiment is a 6*6 net cage array. The net cage array includes a net cage body 1, an adjusting float 2, a connecting cable 3, and a horizontal fixing cable 4. The net cage body includes a net cage frame and a net, which are connected to the horizontal fixing cable frame by the connecting cable. The adjusting float is fixed to the net cage body by a retractable rope 21. The horizontal fixing cable includes a main cable frame 41, side cables 42, fixed side cables 43, and floats 44. The fixed side cables are used to fix to the seabed 7 or other underwater fixed objects such as anchors 5. The floats are fixed at the connection between the main cable frame and the side cables, and float on the sea surface to provide upward tension. The main cable frame is located at a certain depth underwater. The main cable frame is composed of longitudinal cables 411 and transverse cables 412 to form a square enclosure. The net cage body is connected to the four corners of the main cable frame to form the square enclosure by connecting ropes.

[0021] In a preferred embodiment, the main cable frame forms a square enclosure at a certain depth underwater. In this embodiment, the main cable frame is positioned 5 meters below sea level, allowing the net cage to rise to the surface or descend 5 meters below or above the main cable frame, with the main cable frame as its center. Specifically, the net cage is a square with sides of 20 meters; the hanging netting is made of polyester mesh with a wire diameter of 2.5 mm, a mesh size of 30*40 mm, and a length of 8 meters; each enclosure within the main cable frame is 60*60 meters long, and the connecting rope is 35 meters long.

[0022] The main body of the net cage can be raised or lowered by adjusting the length of the retractable rope and the connecting rope of the float, while the float floats on the sea level 6.

[0023] Previous experimental studies have shown that in a regularly arranged group of net cages, the cumulative reduction in flow velocity along the first 1-2 rows along the main flow direction is approximately 45%, with the first row reducing the flow velocity by about 30% and the second row by about 15%. For the stocking of the cultured species, the first and second rows of net cages facing the main flow direction stock 20cm long greenfin filefish at a density of 50 fish / m³. The third row along the main flow direction followed by the first row (non-main flow direction) stock 20cm long greenfin filefish at a density of 80 fish / m³. Net cages located inside and behind the main flow array normally stock 10cm long greenfin filefish at a density of 100 fish / m³.

[0024] When the sea is calm and the temperature is suitable (9-29℃), the retractable rope of the adjustment float is pulled up, reducing its length to 0 meters, to raise the net cage to the sea level. When encountering severe weather such as typhoons or when the upper sea temperature is high (above 29℃) or low (below 9℃), the retractable rope under the adjustment float is released, with a total length of 10 meters, causing the net cage to sink to 5 meters below the main cable frame, i.e., 10 meters below the sea level.

[0025] After a year of aquaculture in the waters off Shantou, Guangdong Province (23-25 ​​meters deep), the greenfin pufferfish placed in 20cm long net cages all had a harvest weight of over 500g, and the greenfin pufferfish placed in 10cm long net cages all had a harvest weight of over 400g. The survival rate of all 36 net cages was over 85%.

Claims

1. A net cage array suitable for deep-sea aquaculture, characterized in that, The aforementioned net cage array is a square or rectangular array composed of net cages. The net cages are able to float and sink to a certain depth below the water surface; the net cages are arranged in regular rows and columns. The net cage array includes a net cage body (1), an adjusting float (2), a connecting cable (4), and a horizontal fixed cable frame. The net cage body (1) is connected to the horizontal fixed cable frame via the connecting cable (4). The adjusting float (2) is fixed to the net cage body (1) via a retractable rope (3). The horizontal fixed cable includes a main cable frame (41), side cables (42), fixed side cables (43), and floats (44). The fixed side cables (43) are used to fix the net cage to the seabed or other underwater fixed objects. The floats (44) are fixed at the connection between the main cable frame (41) and the side cables (42), and float on the sea surface to provide upward tension. The main cable frame (41) is located at a certain depth underwater. The main cable frame (41) is composed of longitudinal cables (411) and transverse cables (412) to form a square enclosure. The net cage body (1) is connected to the main cable frame (41) via connecting ropes to form the four corners of the square enclosure. The main cable frame (41) forms a square enclosure at a certain depth underwater. The net cage can rise to the surface of the water or descend below the main cable frame (41) with the main cable frame (41) as the center.

2. A net cage array suitable for deep-sea aquaculture according to claim 1, characterized in that, The main body of the net cage (1) can be raised or lowered by adjusting the length of the retractable rope (3) and the connecting rope of the float (2), while the float (2) floats on the sea surface.

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