Net cage array for deep and far sea culture and method for culturing modestus septentrionalis

Abstract

The invention relates to a net cage array for deep and far sea culture and a method for culturing modestus septentrionalis, and belongs to the technical field of aquaculture facilities, the net cage array is a square or rectangular array composed of net cages, and the net cages can sink and float and sink to a certain depth below the water surface; the net cages are regularly distributed in rows and columns; the invention further provides a method for culturing the nadon septentrionalis by using the net cage array, and the method comprises the following steps: putting fishes with strong swimming ability into the first to second rows of net cages in the head-on mainstream direction and the first row of net cages in the non-mainstream direction or putting a proper amount of large-sized nadon septentrionalis; net cages located in the net cage array and behind the net cage array are used for normally breeding the septentrionus septentrionalis with the overall length being 10 cm or above. According to the net cage array type regular arrangement, the flow velocity intensity is reduced, the net cage sinks to a certain depth, the influence of extreme weather such as high temperature is avoided, and the rumex septentrionalis which is weak in swimming capacity and does not resist high temperature and low temperature can also be bred in deep and far sea.

Description

Technical Field

[0001] The present invention belongs to the technical field of aquaculture facilities, and particularly relates to a cage array for deep - sea and far - sea aquaculture and a method for culturing Thamnaconus septentrionalis. Background Art

[0002] In the current aquaculture field, as a fish with high economic value, the development of the culturing technology of Thamnaconus septentrionalis has attracted much attention. In the traditional inshore aquaculture mode, many serious problems have emerged during the long - term practice process. The inshore aquaculture areas are relatively closed, and the water exchange capacity is weak. With the continuous expansion of the aquaculture scale, a large amount of residual bait, fish excreta, etc. accumulate on the seabed, resulting in extremely serious eutrophication of the seabed. This eutrophication promotes the massive reproduction of seabed microorganisms, consumes a large amount of dissolved oxygen, severely deteriorates the seabed ecological environment, seriously squeezes the living space of many benthic organisms, greatly reduces the biodiversity, and makes the originally rich and diverse seabed ecosystem become extremely single and fragile. At the same time, a large amount of drugs used in the aquaculture process have also caused inestimable damage to the seabed ecology. These drug residues diffuse through the seawater, affecting the ecological balance of the surrounding sea areas and posing a huge threat to the stability of the entire inshore ecosystem.

[0003] In view of the serious damage caused by inshore aquaculture to the ecological environment, relevant policies have been strictly adjusted. Policies have been introduced everywhere to strictly restrict large - scale aquaculture activities in inshore areas, greatly limiting the development space of inshore aquaculture. Aquaculture farmers are urgently in need of finding new aquaculture areas and modes. However, when turning their attention to deep - sea and far - sea aquaculture, new problems arise. Although the deep - sea and far - sea areas have vast space and good water quality conditions, the wind and wave conditions are extremely complex and harsh. Affected by strong winds, huge waves and ocean currents all year round, extremely high requirements are put forward for the stability of aquaculture facilities. Ordinary aquaculture cages are easily damaged by the impact of wind and waves in such an environment, resulting in the escape of cultured fish and causing huge economic losses. In addition, the physiological characteristics of Thamnaconus septentrionalis itself also pose challenges to its culture. The fins of Thamnaconus septentrionalis are relatively small, making its swimming ability slightly weak. In the deep - sea and far - sea aquaculture environment, large wind and waves and water currents will make it difficult for Thamnaconus septentrionalis to maintain its position and swimming posture, and it is easily washed away by the water current or lose its normal physiological and swimming ability. 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 disadvantageous to its survival and growth in the deep - sea and far - sea aquaculture environment. Summary of the Invention

[0004] The purpose of this invention patent is to provide a cage array for deep - sea and far - sea aquaculture and a method for culturing Thamnaconus septentrionalis. The method slows down the water flow by regularly arranging large - scale array cages and enables the fish to sink through the cages to avoid bad weather.

[0005] The present invention is implemented by the following technical solutions:

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

[0007] As a preferred embodiment, the cage array includes a cage body (including a cage frame and a net), an adjusting float, a connecting cable, and a horizontal fixed cable frame. The cage body is connected to the horizontal fixed cable frame through the connecting cable. The adjusting float is fixed on the cage body through a retractable rope. The horizontal fixed cable includes a main cable frame, side cables, fixed side cables, and floats. The fixed side cables are used to fix to the seabed or other underwater fixtures; the floats are fixed at the connection of the main cable frame and the side cables, and float on the sea surface to provide an upward pulling force; and the main cable frame is located at a certain depth underwater. The main cable frame is composed of longitudinal cables and transverse cables to form a square enclosure net. The cage body is connected to the four corners of the square enclosure net formed by the main cable frame through connecting ropes;

[0008] As a preferred embodiment, the square enclosure net formed by the main cable frame is located at a certain depth underwater, and the cages can rise to the water surface or descend below the main cable frame with the main cable frame as the center.

[0009] As a preferred embodiment, the cage body rises or descends by changing the lengths of the retractable rope of the adjusting float and the connecting rope, and the adjusting float floats on the sea surface.

[0010] The present invention also provides a method for culturing Thamnaconus septentrionalis using the above - mentioned cage array. The method is to put fish with strong swimming ability or appropriately place large - sized Thamnaconus septentrionalis in the cages of the 1st - 2nd rows in the oncoming mainstream direction and the 1st row in the non - mainstream direction behind the 1st - 2nd rows along the mainstream direction. The cages located inside and behind the cage array are used to normally culture Thamnaconus septentrionalis with a total length of more than 10 cm, and the culture density is 90 - 120 tails per cubic meter; the large - sized ones refer to Thamnaconus septentrionalis with a total length of more than 20 cm, and the culture density is 50 - 80 tails per cubic meter.

[0011] The beneficial effects of the present invention compared with the prior art: Through the regular arrangement of the cage array, the flow velocity intensity is slowed down, and by sinking the cages to a certain depth, the influence of extreme weather such as high temperature is avoided, enabling Thamnaconus septentrionalis with weak swimming ability and intolerance to high and low temperatures to be cultured in the deep - sea and far - sea areas. Brief Description of the Drawings

[0012] Figure 1 It is a top - view of the 6×6 cage array of the present invention;

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

[0014] Figure 3 This is the enlarged top view of a single cage;

[0015] Note: 1. Cage body, 2. Adjusting float, 21. Retractable rope, 3. Connecting cable, 41. Main cable frame, 42. Side cable, 43. Fixed side cable, 44. Float, 411. Longitudinal cable, 412. Transverse cable, 5. Anchor stone, 6. Sea level, 7. Seabed. Detailed implementation mode

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

[0017] Embodiment 1

[0018] As shown in Figures 1-3 A deep-sea aquaculture method suitable for Thamnaconus septentrionalis, the method includes the layout of the cage array and the release of aquaculture varieties;

[0019] For the layout of the cage array, the cage array is a square or rectangular array composed of cages, and the cages can sink and float, sinking to a certain depth below the water surface; the cages are arranged in regular rows and columns;

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

[0021] As a preferred embodiment, the main cable frame forms a square enclosure net at a certain depth underwater. In this embodiment, the main cable frame is selected to be 5 meters below the sea level. The net cage can take the main cable frame as the center and rise to the water surface or descend 5 meters below or above the main cable frame. As a specific embodiment, the net cage is a square with a side length of 20 meters; the hanging netting is made of polyester net with a wire diameter of 2.5 mm and a mesh size of 30*40 mm, and the length is 8 meters; the specification of each enclosure net in the main cable frame is 60*60 meters, and the length of the connecting rope is 35 meters.

[0022] The main body of the net cage rises or descends by adjusting the lengths of the retractable ropes of the adjusting floats and the connecting ropes, and the adjusting floats float on the sea surface 6.

[0023] Through preliminary experimental research, it is proved that for the regularly arranged net cage group, the cumulative attenuation along the mainstream direction for 1-2 rows of net cages reaches about 45%. The first row weakens the flow velocity intensity to about 30%, and the second row of net cages reduces the flow velocity by about 15%; for the release of the aquaculture varieties, in the first and second rows of net cages in the oncoming mainstream direction, greenfin leatherjackets with a total length of 20 cm are cultured, and the breeding density is usually 50 tails / cubic meter. In the first row of net cages in the non-mainstream direction after the third row along the mainstream direction, greenfin leatherjackets with a total length of 20 cm are cultured, and the breeding density is 80 tails / cubic meter. In the net cages inside and behind the square matrix, greenfin leatherjackets with a total length of 10 cm are normally cultured, and the breeding density is 100 tails / cubic meter.

[0024] When the sea surface is calm and the temperature is suitable (9-29 °C), by retracting the retractable ropes of the adjusting floats, that is, reducing the length of the retractable ropes to 0 meters, the net cage rises to the sea surface. When encountering bad weather such as typhoons or the water temperature of the upper layer of sea water is relatively high (above 29 °C) or relatively low (below 9 °C), release the retractable ropes under the adjusting floats. The total length of the retractable ropes is 10 meters, and the net cage sinks 5 meters below the main cable frame, that is, 10 meters below the sea level.

[0025] After one year of aquaculture in the offshore area of Shantou, Guangdong Province (with a water depth of 23-25 meters), the harvested weight of the greenfin leatherjackets initially placed in the net cages with a total length of 20 cm is more than 500 g, and the harvested weight of the greenfin leatherjackets initially placed in the net cages with a total length of 10 cm is more than 400 g. The survival rate of all the above 36 net cages is as high as more than 85%.

Claims

1. A cage array for deep - sea and far - sea aquaculture, characterized in that, The described cage array is a square or rectangular array composed of cages. The cages can sink and float, and sink to a certain depth below the water surface. The cages are distributed in regular rows and columns. The described cage array includes a cage body (1), adjusting floats (2), connecting cables (4), and a horizontal fixed cable frame. The cage body (1) is connected to the horizontal fixed cable frame through the connecting cable (4). The adjusting floats (2) are fixed to the cage body (1) through retractable ropes (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 to the seabed or other underwater fixtures. The floats (44) are fixed at the connection of the main cable frame (41) and the side cables (42), and float on the sea surface to provide an upward pulling force. 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 net. The cage body (1) is connected to the four corners of the square enclosure net formed by the main cable frame (41) through connecting ropes. The square enclosure net formed by the main cable frame (41) is located at a certain depth underwater. The cages can rise to the water surface or descend below the main cable frame (41) with the main cable frame (41) as the center.

2. The cage array for deep - sea and far - sea aquaculture according to claim 1, wherein, The depth of the cage body (1) is changed by adjusting the lengths of the retractable ropes (3) of the adjusting floats (2) and the connecting ropes, so that the cage body (1) rises or descends, and the adjusting floats (2) float on the sea surface.

3. A method for culturing Thamnaconus septentrionalis using the cage array according to claim 1 or 2, characterized in that, The described method is to release fish with strong swimming ability or appropriately place large-sized Thamnaconus septentrionalis in the cages in the 1st - 2nd rows in the oncoming mainstream direction and the 1st row in the non-mainstream direction after the 1st - 2nd rows along the mainstream direction. Greenfin leatherjackets with a total length of more than 10 cm are normally cultured in the cages inside and at the rear of the cage array, and the stocking density is 90 - 120 tails per cubic meter. The large-sized ones refer to Thamnaconus septentrionalis with a total length of more than 20 cm, and the stocking density is 50 - 80 tails per cubic meter.

Images