CN109122433B

CN109122433B - Raft formula snail device of raising in cages

Info

Publication number: CN109122433B
Application number: CN201810978631.9A
Authority: CN
Inventors: 吴常文; 张建设
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2021-02-19
Anticipated expiration: 2038-08-27
Also published as: CN109122433A

Abstract

The invention provides a raft type snail cage culture device, which belongs to the technical field of culture devices, and comprises a snail cage, wherein one side surface of the snail cage is provided with an opening and closing device, two end parts of the snail cage are connected with magnetic blocks, a floating ball is connected above the snail cage, the floating ball and the snail cage are uniformly distributed on a rope, and two ends of the rope are connected with anchor piles arranged on the sea bottom.

Description

Raft formula snail device of raising in cages

Technical Field

The invention belongs to the technical field of culture devices, and particularly relates to a raft type snail cage culture device.

Background

Ocean development, reef island and fishery. The island reef is a leading-edge place of ocean development in China, an important fulcrum and an important field of fishery development, and the southeast edge of China mainly contains three types of reef, mud and sand bottom materials in the intertidal zone. The continental intertidal zone takes mud bottom as main material, and the reef and sand bottom are inferior, especially the reef bottom of the intertidal zone of the island shore, and the mud and sand bottom are inferior, and according to the preliminary statistics, the length of the shore line in the whole intertidal zone is more than 60%, and the area is more than 50%. The coastal island reef chess cloth of Fujian Zhejiang, such as Zhoushan island, has 13395 islands, 3500 island reef longitudinal lines and reef bottom intertidal zones as main bodies.

Among several types of intertidal zones, the sand substrate intertidal zone shoreline has limited length and area and is generally developed as a tourism resource. The intertidal zone of the sediment is a pond-enclosing culture and mudflat culture development area in China, and various fishes, shrimps and shellfish are mainly produced by pond-enclosing culture. Mudflat cultivation produces mainly shellfish, algae such as clams, snails and kelp porphyra, and is currently developed and utilized to be basically saturated or supersaturated. For a long time, with the increase of land environmental pollution and the increase of development and utilization of people, the pond-enclosing cultivation and beach cultivation industries are influenced to a certain extent, and no matter from the perspective of space utilization or environmental bearing capacity, further development is impossible. On the contrary, the reef intertidal zone is blank in artificial breeding besides artificial collection resources.

The intertidal zone of the island reef zone outside is not only a habitat of a plurality of large benthic seaweeds such as oyster, ulva, sargassum fusiforme, ciliate algae, kelp, laver and the like, but also a habitat of a plurality of shellfish such as mussels (common mussels, thick mussels), thamnis gigas (conch, rusty snails) and unidentate snails (warts, unidentate snails). For a long time, as a large number of artificial harvesting areas are wider and deeper, the intertidal shellfish and algae resources are continuously reduced, the possibility of natural recovery is not high, and the artificial aquaculture industry must be developed on the basis of strengthening protection.

In the prior art, for example, the Chinese invention publication No. CN 104604762A, an open sea area cage-sinking rope-type culture method and a culture device thereof can be used for culturing snails or abalones in a sea area with 8-15 meters, and the problems that the culture space is too crowded and the growth of the abalones and the snails is easily influenced in a shallow sea area within 8 meters are solved, but the area and culture environment in which the device is put are not good for the growth of the snails and the abalones, and the yield-increasing benefit of the abalones and the snails is not great.

Disclosure of Invention

The invention aims to provide a raft type snail cage culture device which can simulate the natural growth environment of snails in the intertidal zone of an island reef area to culture snails, develops and utilizes a sea area with the depth of-25 m as a culture area, can estimate the yield in the culture process, improves the culture quality of snails and has high culture safety.

The scheme adopted by the invention for realizing the purpose is as follows: a raft type cage culture device for snails comprises a spiral cage, wherein an opening and closing device is arranged on one side surface of the spiral cage, magnetic blocks are connected with two end portions of the spiral cage, floating balls are connected above the spiral cage, the floating balls and the spiral cage are uniformly distributed on a rope, two ends of the rope are connected with anchor piles arranged on the sea bottom, a cage body formed by injection molding with the diameter of 50cm and the length of 80cm can be selected as a culture spiral cage, magnetic blocks are arranged at two ends of the spiral cage, a plurality of magnetic blocks are placed before the spiral cage is placed, the weight of each magnetic block and the water depth position of the spiral cage in a water body are measured, the magnetic blocks are continuously taken out to keep the position of the spiral cage in the water along with the lapse of culture time, the culture yield can be estimated by calculating the weight of the taken out magnetic blocks, the principle that the two end portions of each culture spiral cage cannot collide is utilized, the integrity of the spiral cage and the culture safety and stability are protected, the distance between the spiral cages is 5m, the length of the optional rope is 200 m, 10-20 combinations formed by floating balls and the spiral cages are arranged on the rope, a plurality of combined ropes formed by the floating balls and the spiral cages are uniformly distributed in an area with the water depth of less than or equal to 40m and the flow velocity of less than or equal to 1.5/s according to the culture requirement and are used for culturing the snails such as the thamna japonica, the single-tooth snails, the turban snails and the like, the natural growth environment of the snails is simulated by selecting the culture area, the designed culture spiral cages and the hanging distribution mode, the artificial culture of the snails is developed, the development and utilization in the sea area with the water depth of-25 m are realized, and the popularization and the application have good.

In order to optimize the technical scheme, the adopted measures further comprise: the floating balls are connected at two ends of the rope floating on the water surface, the weight blocks are connected below the floating balls, so that when the raft type spiral shell cage culture device encounters wind waves, the floating balls and the weight blocks are firstly influenced by the wind waves and float on two ends of the water surface, the influence of the wind waves on the spiral shell cage hung in the middle of the rope is reduced, the weight blocks are cylinders, concave arc surfaces are arranged in the surfaces of the cylinders, through holes are formed in the axes of the concave arc surfaces, water can pass through the arc surfaces in the middle of the weight blocks and pass through the round holes, the slow flow effect is realized, the gradual wave reduction effect can be realized due to more ropes arranged in the culture area, the culture device in the whole culture area can resist the influence of 12-level typhoon, the weight blocks are made of adsorptive materials, such as vermiculite, silicalite, silica gel and other adsorptive materials, the weight blocks have the slow flow effect, large-particle pollutants in the water in the culture area can be adsorbed, the weight can be replaced regularly. The middle of the rope in the water body is connected with the telescopic concentrator, the upper portion of the telescopic concentrator is connected with the floating ball, the lower portion of the telescopic concentrator is connected with the heavy block, the slow flow effect on stormy waves can be further achieved, the slow flow effect of the stormy waves with the water depth ranging from-10 meters to-20 meters is achieved below the culture area, the length of the rope at two ends can be automatically retracted and extended according to the strength of the stormy waves, the rope is prevented from being broken under the impact of the stormy waves, and the effect of protecting the safety of the culture device is. The device that opens and shuts transversely is equipped with two parallels and the horizontal pole fixed with the spiral shell cage, is connected with concave pole and protruding pole through the lantern ring is perpendicular respectively between the horizontal pole, is connected with the netting between concave pole, protruding pole and the spiral shell cage, and the concave hole corresponding with the protruding piece on the convex pole is seted up on the concave pole surface, is connected with rotatable open-close plate on the protruding pole, is equipped with the protruding ball corresponding with the concave hole on the concave pole on the open-close plate one side, is equipped with the U shape strip ring on the open-close plate other side. The U shape ring strip on the plywood one side of design is placed at spiral shell cage and is made in the aquatic, the ring strip can influence the rivers motion trail around the plywood, rivers can make the propagation direction of the light in aquatic produce the change and refract to spiral shell cage around in the change of motion trail, improve illuminance around the spiral shell cage and be of value to promoting the reproductive capacity and the spiral shell class spawning rate of breeding the spiral shell class, realize the improvement of spiral shell class breed output and quality, the device that opens and shuts of design slides through the lantern ring and slides the opening and shutting of concave pole and protruding pole, be convenient for get and put the spiral shell class, bait, alga or get and put the magnetic path, and concave pole and protruding pole can peg graft and take the closure and the security that the cooperation improved the device that opens and shuts with detaining. The through hole is formed in the surface of the cage body of the spiral shell cage, the surrounding of the water bodies inside and outside the spiral shell cage is completely consistent, the diameter of the formed through hole can be selected to be phi 0.5-1cm, the circulation of water in the cage body is facilitated, the aperture is smaller than the volume of the spiral shell, the spiral shell is prevented from escaping, the breeding safety is guaranteed, the reinforcing ribs are arranged on the surface of the cage body in a surrounding mode, the firmness of the spiral shell cage and the connection stability of the floating ball and the rope can be further improved, and the economic loss caused by the fact that the spiral shell cage falls off with. The horizontal interval of spiral shell cage is 6~7 times of spiral shell cage length, can effectively avoid adjacent spiral shell cage bump or winding under the circumstances that spiral shell cage aquatic rocked, and the magnetic path can further prevent such incident from taking place, the rope is all established in the aquatic, the rope interval is 12~15 times of spiral shell cage length, it is used for breeding nautilus majus to arrange the rope of the combination that floater and spiral shell cage formed according to breeding needs equipartition many in the breed region, single-tooth snail, shells such as turban snail, it can effectively avoid adjacent spiral shell cage bump or winding under the circumstances that spiral shell cage aquatic rocked to set up interval between the rope, and the magnetic path can further prevent such incident from taking place.

Compared with the prior art, the invention has the beneficial effects that: historically, snails in intertidal zones in island reef areas are harvested naturally, resources are limited, yield is unstable, and industries cannot be formed. The sea area with the depth of-25 meters is utilized as a culture area, which is beneficial to developing the unused sea area, and the method has good economic, social and ecological benefits and is expected to form a new industry.

Drawings

FIG. 1 is a schematic side view of a raft cage culture apparatus of the invention;

FIG. 2 is a schematic view of a spiral cage;

FIG. 3 is a schematic diagram of a further optimized spiral cage;

FIG. 4 is a cross-sectional view of a female rod;

FIG. 5 is a cross-sectional view of the nose bar;

fig. 6 is a schematic view of the structure of the weight.

Description of reference numerals: 1, a spiral cage; 101 a cage body; 102 an opening and closing device; 102a cross bar; 102b a female rod; 102c a collar; 102d protruding rod; 102e, netting; 102f plywood; 103 reinforcing ribs; 104 magnetic blocks; 2, floating ball; 3, a weight block; 4, a telescopic concentrator; 5, a rope; 6 sea surface lines; 7, the sea bottom; 8, anchoring piles.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the embodiments and the accompanying drawings:

example 1:

as shown in figures 1-2, a raft type snail cage culture device comprises a snail cage 1, wherein one side surface of the snail cage 1 is provided with an opening and closing device 102, floating balls 2 are connected above the snail cage 1, the floating balls 2 and the snail cage 1 are uniformly distributed on a rope 5, two ends of the rope 5 are connected with anchor piles 8 arranged on the seabed 7, a cage body formed by injection molding with the diameter of 50cm and the length of 80cm is selected as a culture snail cage 1, the floating balls 2 and the snail cage 1 form a combination and are uniformly distributed on the rope 5, the interval between the snail cages 1 is 5m, the length of the optional rope 5 is 200 m, 15 combinations formed by the floating balls 2 and the snail cage 1 are arranged on the rope 5, and a plurality of ropes 5 formed by arranging the floating balls 2 and the snail cage 1 are uniformly distributed in an area with the water depth of less than or equal to 40m and the flow velocity of less than or equal to 1.5/s according to culture requirements for culturing snails such as thamnion, the sna, The designed breeding spiral cage 1 and the hanging distribution mode simulate the natural growth environment of the spirals to develop the artificial breeding of the spirals, realize the development and utilization in the sea area with the depth of 25 m below zero, and have good economic, social and ecological benefits when being popularized and applied.

The two ends of the rope 5 floating on the water surface are connected with the floating balls 2, the heavy blocks 3 are connected below the floating balls 2, so that when the raft type spiral shell cage culture device encounters wind waves, firstly, the floating balls 2 and the heavy blocks 3 of the rope 5 floating on the two ends of the water surface are influenced by the wind waves, and the influence of the wind waves on the spiral shell cage 1 hung in the middle of the rope 5 is reduced.

The middle of the rope 5 in the water body is connected with the telescopic concentrator 4, the floating ball 2 is connected above the telescopic concentrator 4, the heavy block 3 is connected below the telescopic concentrator 4, the slow flow effect on stormy waves can be further achieved, the slow flow effect on the stormy waves in the water depth range of-10 meters to-20 meters below the cultivation area is achieved, the length of the rope 5 at two ends can be automatically extended and retracted according to the strength of the stormy waves by the telescopic concentrator 4, the rope 5 is prevented from being broken under the impact of the stormy waves, and the effect of protecting the safety of the cultivation device is achieved.

Example 2:

referring to fig. 3-5, the optimization scheme of this embodiment based on embodiment 1 is as follows: two ends of the spiral shell cage 1 are connected with magnetic blocks 104, the magnetic blocks 104 are arranged at two ends of the spiral shell cage 1, the magnetic blocks 104 are placed in the spiral shell cage before the spiral shell cage is put in, the weight of each magnetic block 104 is measured, the water depth position of the spiral shell cage 1 in a water body is obtained, the magnetic blocks 104 are continuously taken out along with the passing of the culture time to keep the position of the spiral shell cage 1 in the water, the culture yield can be estimated by calculating the weight of the magnetic blocks 104, the principle that the magnetic blocks are attracted by each other in opposite polarities and repellent by each other in the same polarity is utilized, collision between two ends of each cultured spiral shell cage 1 can be avoided, and.

The surface of the cage body 101 is provided with the reinforcing ribs 103 in a surrounding manner, so that the firmness of the spiral cage 1 and the connection stability of the floating ball 2 and the rope 5 can be further improved, and the economic loss caused by the falling of the spiral cage 1 and the rope 5 or the floating ball 2 in the breeding process is avoided. The transverse spacing of the spiral cage 1 is 6 times of the length of the spiral cage 1, the adjacent spiral cages 1 can be effectively prevented from being collided or wound under the condition that the spiral cage 1 shakes in water, the magnetic blocks 104 can further prevent the occurrence of the events, the ropes 5 are all arranged in water, the spacing of the ropes 5 is 12.5 times of the length of the spiral cage 1, the ropes 5 which are formed by the floating balls 2 and the spiral cages 1 are uniformly distributed in a culture area according to culture needs, and are used for culturing the snails such as the thamna polyphylla, the single-tooth snails and the turban snails, the adjacent spiral cage 1 is collided or wound under the condition that the spiral cage 1 shakes in water can be effectively avoided by setting the spacing between the ropes 5, and the magnetic blocks 104 can further prevent the occurrence of the.

The surface of the spiral cage 1 and the surface of the opening and closing device 102 are provided with slow release gel, and the slow release gel comprises the following material components in parts by weight: 30 parts of gypsum powder, 70 parts of polylactic acid, 4 parts of polyethylene glycol adipate, 3 parts of amino acid, 4 parts of lecithin, 3 parts of vitamin A, 8 parts of polyvinyl chloride resin, 0.4 part of tartaric acid, 2 parts of a thickening agent, 3 parts of open-cell expanded perlite and 1 part of nano silicon dioxide. The polylactic acid has good biodegradability and mechanical property, the surface hydrophobicity is stronger but still needs to be improved, and the controllability of the mechanical property and the biodegradation time is poorer. The polyethylene glycol adipate and the polyvinyl chloride resin are adopted to graft and modify polylactic acid, so that the hydrophobicity of the polylactic acid is improved, and water cannot enter the degradable material before the degradable material is not automatically degraded and gaps appear. Under the premise of existence of nano silicon dioxide, the tartaric acid can improve the grafting rate of the degradable material, and the ratio of L-tartaric acid in the tartaric acid is as follows: the proportion of D-tartaric acid is 20: 3 (the mechanical strength of the degradable material is obviously improved while the grafting rate is improved). The components in the degradable material have a coordinated effect, but the specific mechanism is not clear. The degradable material does not have water permeability, and is slowly degraded along with the passage of time, slowly releases nutrient substances to improve the growth speed and quality of the snails, and achieves the effect of further increasing the yield.

The opening and closing device 102 is transversely provided with two parallel cross rods 102a fixed with the spiral cage 1, the cross rods 102a are vertically connected with a concave rod 102b and a convex rod 102d through lantern rings 102c respectively, net clothes 102e are connected between the concave rod 102b, the convex rod 102d and the spiral cage 1, concave holes corresponding to convex blocks on the convex rod 102d are formed in the surface of the concave rod 102b, a rotatable opening and closing plate 102f is connected onto the convex rod 102d, convex round balls corresponding to the concave round holes on the concave rod 102b are arranged on one side of the opening and closing plate 102f, and U-shaped ring strips are arranged on the other side of the opening and closing plate 102 f. The designed opening and closing device 102 can be opened and closed in a sliding mode through the lantern ring 102c and the sliding concave rod 102b and the sliding convex rod 102d, so that snails, baits and algae or magnetic blocks can be conveniently taken and placed, and the concave rod 102b and the convex rod 102d can be connected in a buckling and overlapping mode to improve the sealing performance and the safety of the opening and closing device 102. The U-shaped ring strip on the one side of the designed open close plate 102f is placed in water to be made at the spiral shell cage 1, the ring strip can influence the water flow movement track around the open close plate 102f, water flow can make the propagation direction of light in water change and refract to the periphery of the spiral shell cage 1 when the movement track changes, the illumination intensity around the spiral shell cage 1 is improved, the reproductive capacity and the spiral shell spawning rate of cultured spiral shells are favorably improved, the improvement of the spiral shell culture yield and quality is realized, the through hole is formed in the surface of the cage body 101 of the spiral shell cage 1, the water bodies inside and outside the spiral shell cage 1 are completely consistent in surrounding mode, the diameter of the formed through hole is preferably phi 0.7cm, the water flow in the cage body 101 is convenient, the hole diameter is smaller than the volume of the spiral shell to.

Example 3:

referring to fig. 6, the optimization scheme of this embodiment based on embodiment 1 is as follows: pouring weight 3 is the cylinder, establish concave cambered surface and axle center department in the cylinder surface and set up the through-hole, can make rivers from the cambered surface process at pouring weight 3 middle part and through the effect of round hole in order to realize slow flow, because the breed area sets up more rope 5, alright realize reducing the effect of stormy waves step by step, 12 grades of typhoon's influence can be resisted to the breeding device in whole breed district, pouring weight 3 is the adsorptivity material, for example, vermiculite, silicalite, adsorbability materials such as silica gel, pouring weight 3 not only has the effect of slow flow, still can adsorb the large granule pollutant in the regional water of breed, purify the regional quality of water of breed and improve the breed quality of spiral shell class, regularly change pouring weight 3 can.

The structural shape of the weight 3 may also be: the pouring weight 3 is a cylinder in the middle, and the side surface is surrounded with a rectangular water baffle.

Example 4:

and (3) testing the effect of the culture device:

selecting a mooring area near an island reef at one outer side of a fixed sea area in Zhoushan of Zhejiang,

the culture device comprises: the raft type snail cage culture device (experimental group) designed by the invention is a commercial culture cage (control group), and the capacities of the culture devices are the same. The experimental group culture area is an area with the water depth less than or equal to 40m and the flow velocity less than or equal to 1.5/s; the culture area of the control group is an area with the water depth less than or equal to 15m and the flow velocity less than or equal to 1.0/s.

Selecting breeding varieties: a single-tooth screw; the common name of the monodentate snail (Monodonta labio Linnaeus) is sessile snail, of the phylum Mollusca (Mollusca), of the class Gastropoda (Gastropoda), of the order primitive Gastropoda (Archaeoglossopoda), of the general family Calathea (Trochidae); the breeding quantity is as follows: 100 plants are cultivated in each device; the average shell height is 1cm, the wild capture is realized, and the culture time is as follows: 180 d.

During the cultivation period, equal amounts of diatom and fucoidin are put into the two groups of cultivation devices, when the water temperature is high, the putting amount is reduced, bait is prevented from being rotten, the growth condition of the cultivated single-tooth snails is observed, dead snails are removed in time, the records are made, the experimental group simulates the growth environment of the single-tooth snails, the number of the single-tooth snails is recorded, the weather condition of the cultivation area, particularly typhoon, is observed periodically, and the two groups of cultivation devices are broken without netting, and the records are made.

After the breeding is finished, the single-tooth snails are harvested and measured one by one, the average shell height of an experimental group is 2.21cm, the survival rate is 93%, the average shell height of a control group is 1.84cm, and the survival rate is 82%.

And (3) respectively carrying out nutrient analysis on the single-tooth snails cultured in the experimental group and the control group: taking out snail meat by biopsy, and sucking water on the surface of muscle by using filter paper to weigh the snail meat. Mashing muscle, mixing well, dividing into 2 parts, and measuring common nutrient components in one part; the other part is used for measuring amino acid, fatty acid and mineral substance.

Imported and subpackaged by Anthracene and Coomassie brilliant blue Shanghai Sangon reagent company; bovine Serum Albumin (BSA) Sigma, usa; hydrochloric acid, potassium sulfate, copper sulfate, diethyl ether, sulfuric acid and sodium hydroxide are all analytically pure Shanghai group of Chinese medicines. KDN-08A type kjeldahl nitrogen determination instrument shanghai flood period instrument equipment ltd; german aminosys model a200 amino acid analyzer, amminos, germany; clarus 480 gas chromatography-mass spectrometer, PerkinElmer, USA.

The determination method comprises the following steps: general nutrient determination: according to GB/T5009.3-2003 'determination of moisture in food', directly drying in an oven at 105 ℃ to determine moisture; according to GB/T5009.5-2003 'determination of protein in food', using Kjeldahl method to determine crude protein; fat is measured by a Soxhlet extraction method according to GB/T5009.6-2003 'determination of fat in food'; according to GB/T5009.4-2003 'determination of ash content in food', the ash content is determined by a high-temperature (550 ℃) ignition method; measuring total sugar by anthrone colorimetry; according to the GB/T5009.124-2003 standard of determination of amino acids in food, an amino acid analyzer is used for determining 17 amino acids except tryptophan, and a fluorescence spectrophotometry is used for determining the tryptophan; the fatty acids were determined by gas chromatography-mass spectrometer.

The method for evaluating the nutritional quality comprises the following steps:

the evaluation of the nutritional value was carried out based on the standard pattern of amino acid per gram of nitrogen as suggested in the FAO/WHO 1973 and the egg protein pattern as proposed by the institute of Nutrition and food sanitation of the Chinese preventive medicine academy of sciences, and the Amino Acid Score (AAS), the Chemical Score (CS) and the Essential Amino Acid Index (EAAI) [9] were calculated as follows.

In the formula: AAp is the mass fraction/(g/100 g) of a certain essential amino acid in the sample; AAe is the mass fraction/(g/100 g) of the corresponding essential amino acid in the egg protein.

TABLE 1 quality fraction table of nutritional ingredients of Oncomelania monodentata (experimental group, control group)

As can be seen from Table 1, the nutritional value of the Oncomelania monodentata cultured in the experimental group is higher than that of the Oncomelania monodentata cultured in the control group.

The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a raft formula snail device of raising in cages, includes spiral shell cage (1), its characterized in that: an opening and closing device (102) is arranged on one side face of the spiral cage (1), magnetic blocks (104) are connected to two end portions of the spiral cage (1), a floating ball (2) is connected to the upper portion of the spiral cage (1), the floating ball (2) and the spiral cage (1) are uniformly distributed on a rope (5), and two ends of the rope (5) are connected with anchor piles (8) arranged on the seabed (7); floating balls (2) are connected to two ends of the rope (5) floating on the water surface, and heavy blocks (3) are connected below the floating balls (2); the weight (3) is a cylinder, a concave arc surface is arranged in the surface of the cylinder, a through hole is formed in the axis, and the weight (3) is made of an adsorptive material; the middle part of a rope (5) positioned in a water body is connected with a telescopic concentrator (4), a floating ball (2) is connected above the telescopic concentrator (4), and a heavy block (3) is connected below the telescopic concentrator; the opening and closing device (102) is transversely provided with two cross rods (102 a) which are parallel and fixed with the spiral cage (1), a concave rod (102 b) and a convex rod (102 d) are respectively and vertically connected between the cross rods (102 a) through lantern rings (102 c), and netting (102 e) is connected between the concave rod (102 b), the convex rod (102 d) and the spiral cage (1); concave holes corresponding to the convex blocks on the convex rods (102 d) are formed in the surfaces of the concave rods (102 b), a rotatable opening plate (102 f) is connected to the convex rods (102 d), convex round balls corresponding to the concave holes on the concave rods (102 b) are arranged on one side of the opening plate (102 f), and U-shaped ring strips are arranged on the other side of the opening plate (102 f).

2. The raft type snail cage culture device of claim 1, wherein: the surface of a cage body (101) of the spiral cage (1) is provided with a through hole, and the surface of the cage body (101) is provided with a reinforcing rib (103) in a surrounding manner.

3. The raft type snail cage culture device of claim 1, wherein: the transverse distance between the spiral cages (1) is 6-7 times of the length of the spiral cages (1).

4. The raft type snail cage culture device of claim 1, wherein: the rope (5) is arranged in water, and the distance between the ropes (5) is 12-15 times of the length of the spiral cage (1).