KR102475503B1 - A harvest method of Cardina denticulata - Google Patents

Abstract

A method for harvesting Neocaridina denticulata according to the present invention effectively selects a single breed of Neocaridina denticulata from various freshwater shrimps initially caught as landslides in nature to increase the survival rate and nesting rate of Neocaridina denticulata during the livestock management period, and Neocaridina denticulata is stored in the harvest groove at the time of harvest, so that there is an effect of reducing the labor and time of the harvesting process.

Description

{A harvest method of Cardina denticulata}

The present invention relates to a harvesting method of Cardina denticulata denticulata De Haan , and more particularly, to effectively select a single variety of shrimp from a variety of first-caught freshwater shrimp that are treated as landslides in nature, thereby increasing the survival rate and It relates to a method of harvesting saebang that can save time and effort during harvesting as well as increase the hatching rate of postlarvae by increasing the incubation rate.

It is a collective term for freshwater shrimp, such as Palaemon paucidens De Haan, scavenger ( Cardina denticulata denticulata De Haan), and raw fish ( Paratya compressa ), which are not a single specific breed that is generally vomited. get caught Usually, one type of raw fish is known as Toha, and it is comprehensively expressed as raw shrimp by confusing saebangi and raw fish, which have a similar appearance, but this is an incorrect expression.

Toha varieties that have domestic industrial value and are distributed are mostly line shrimp and saebaengi. Among the two varieties, the variety that is grafted into the aquaculture business for mass production and processed and distributed as salted seafood is Saebangi. In addition, recently, it is actively used to improve the environment for breeding ornamental fish, such as decomposition of moss and solid substances in the aquarium, and it is introduced as a new ornamental breed by improving and selecting mutants with various colors.

Saebangi is a freshwater shrimp with a body length of about 25 mm. In terms of appearance, the body color is dark brown, and there is a spine-shaped mottled pattern on the middle line of the upper surface. The carapace has an upper antennal spine and no upper eye spine, and the anterior lateral edge of the carapace is spine-shaped. There are 10 to 20 teeth on the upper edge of the rostrum and 1 to 9 on the lower edge. 1*?*2 pectoral legs with pincers. Pincers are mainly used for prey rather than attacking or defending other individuals. However, it is difficult to observe these characteristics when collected as a very small species, and it can be confirmed through detailed observations such as glass water tanks and beakers.

Most of the inland aquaculture varieties used industrially have low public acceptance due to their unique scent and foreign body sensation, but Saebaengi is widely recognized as a subsidiary material rather than a single use recipe, so it has a very high preference and can be linked with various industries.

However, due to changes in the habitat environment, the distribution area and population of the new snapper are greatly reduced, which limits the ability to meet the demand for catches, and when switching to a rearing fishery, there is a difficulty in supplying mother hatchlings. situation.

When collecting normal mother saebaengi, there is a limit to direct selection by breed after catch because the habitat environment of other species handled, especially row shrimp, and breed overlaps. In addition, in the case of mixed farming with shrimp, it is the main cause of the reduction of the maximum production per unit area due to the formation of areas between the shrimp and the shrimp family, which intensifies aggression and causes predation at the hatching stage during the molting of the shrimp.

Therefore, selection technology is essential before breeding, and planned farming is impossible with a small number of broodstock because it is difficult to predict the amount of hatching under PLs as the amount of eggs between individuals is around 50 to 150 at maturity. Therefore, it is essential to develop a technology that increases the rate of hatching by inducing mass maturation of female hatchlings of randomly captured sex through artificial stimulation to increase the rate of incubation.

Accordingly, Korean Patent Registration No. 10-1845608 discloses a method for mass production of artificial seeds in soil, but the composition of the complete aquaculture method from seed production to harvest is not posted, showing differences.

Korean Patent Registration No. 10-2060326 has a pile member disposed at regular intervals in the field, a wire frame installed on the pile member, and a floor member supported by the wire frame. Here, the wire frame can be installed by forming several layers along the height direction, and the floor member is formed by arranging a plurality of plate members alternately. Therefore, it is disclosed about a shrimp aquaculture structure that is convenient to install and dismantle even in the open field and can provide sufficient living space for shrimp. Domestic Patent Publication No. 10-2021-0126530 discloses that unnecessary movement of workers is reduced to reduce the effort and personnel required for harvesting, enabling economical cultivation through labor cost reduction, and the characteristic that giant prawns eat each other Considering this, individual culture can be strengthened, mass farming can be promoted by increasing breeding density despite individual culture, and the work necessary for breeding giant giant prawns can be reduced by enabling transportation by compartment to provide a farming space. Disclosed is an aquaponics system capable of transporting cells for shrimp farming, which can be conveniently performed in a designated place, thereby minimizing the effort and personnel required for shrimp farming that requires individual farming. Domestic Patent No. 10-1845608 discloses the step of manufacturing a cage for artificial seedlings that can separately accommodate mother and postlarvae in the mother and postlarva compartments (1), natural food for artificial seedlings by fermenting grains step (2) of producing, collecting broodstock, receiving the broodstock in the cage for artificial seedlings in step (1), and feeding natural food in step (2) (3), hatching postlarvae Mass production of artificial seedlings characterized by comprising the step (4) of breeding PLs by feeding natural food in step (2) and the step (5) of harvesting PLs of step (4) when accommodated in the compartment. By providing a method, a method for mass-producing artificial seedlings in the soil that can perform stable aquaculture by producing a large amount of healthy sub-larvae by improving the low spawning amount and severe formula of the same species is disclosed. Domestic Patent No. 10-1443851 provides a shrimp seed production system and production method that can increase the production of shrimp seeds by increasing the survival rate of early shrimp larvae. When shrimp larvae are collected and bred using the shrimp seed production system according to the present invention, the number of larvae for seed production can be increased by promoting hatching of mother shrimp, and the external growth and body components of the larvae can be strengthened. It is possible to secure quality seedlings and increase the survival rate, and thus discloses a production system and production method of shrimp seedlings that can be effectively used in the shrimp farming industry.

The present invention, in order to solve the above problem of difficulty in selecting only larvae from the captured landslides, effectively selects only a single larvae variety from the captured landslides and increases the survival rate and nesting rate of the larvae to improve the first hatching of postlarvae during main breeding. We want to provide a way to save time and effort in harvesting work.

A method for harvesting saebaengi according to an embodiment of the present invention includes the step of capturing soil and submerged soil in a river (A); A stocking preparation step (b) of setting the breeding water temperature in the sorting tank to be the same as the water temperature at the time of catching land and downstream in the step (a), and installing a separation device for blackfish that can float on the surface of the sorting tank; The land streams caught in step (a) are stocked in the sorting tank prepared in step (b), and the water temperature in the sorting tank is lowered at a rate of 1 to 2 ° C / day and maintained at 1 to 5 ° C for 10 to 20 days Separation and sorting step (c) including a separation step and a sorting step of catching the black crayfish that are clustered on the inner wall of the sorting tank and the separation device after the separation step is completed; After stocking the blackbirds selected in the step (c) in a breeding tank made at the same water temperature as the sorting tank, the water temperature in the breeding tank is raised at a rate of 1 to 2℃/day, and then kept at 10 to 15℃ until they are molted. Poran induction step (D) in which the breeding water temperature is raised at a rate of 1 to 2 ° C / day and maintained at 20 to 25 ° C to confirm incubation after confirming mass ecdysis in the breeding tank; Plaster hatching and breeding step (E) of transferring and stocking the new prawns that have passed step (D) into a main breeding tank to incubate and breed postlarvae; It may be composed of a harvesting step (f) of performing harvesting by converting the water flow direction of the main breeding tank in the step (e) in a certain direction.

It may be formed by mixing a blue food coloring in the breeding tank breeding water of the egg induction step. The main breeding tank has a storage space, which is a space where the breeding water and the new beetles that have gone through step (E) are stocked, a water inlet and a drain hole are formed on one side, and a harvest groove is formed at the bottom of the storage space to be penetrated at a certain depth, may be done A blocking device may be installed in the harvesting device so that the flow of water in step (f) is formed toward the harvesting device so that the blackfish is collected in the harvesting device.

The present invention can selectively and easily select new beetles from captured land streams and increase the survival rate and nesting rate of new beetles when selecting and maturation inducing breeding, thereby improving the hatching capacity of the first postlarvae in this breeding culture, as well as the harvesting process. can be made easier to save time and effort.

1 shows a schematic diagram of the saebai harvesting method of the present invention.
Figure 2 shows the saebang separation device of the present invention.
Figure 3 shows a schematic diagram of the operation of the saebang separator of the present invention.
Figure 4 shows a perspective view of the sorting tank in which the saberfish separator of the present invention is installed.
Figure 5 shows a cross-sectional view of an embodiment of the shrimp separator of the present invention.
Figure 6 shows a schematic diagram in the sorting tank of prawns and prawns before and after sorting according to the present invention.
Figure 7 shows the number of breeding and the number of existing breeding in the egg induction step according to the present invention.
Figure 8 shows the molting of the hatching stage of the present invention.
Figure 9 shows the eggs in the hatching stage of the present invention.
Figure 10 shows a schematic diagram of this breeding tank according to the present invention.
Figure 11 shows a perspective view of the harvesting device and the blocking device during the harvesting step of the present invention.
Figure 12 shows a cross-sectional view of the harvesting device and the blocking device of the present invention.
Figure 13 shows the separated shrimp (A) and shrimp (B) individuals according to Experimental Example 1 of the present invention.

Hereinafter, a detailed explanation will be given with reference to the drawings related to the method for harvesting saebangi of the present invention.

1 shows a schematic diagram of the saebai harvesting method of the present invention. The saebai harvesting method of the present invention includes the step of capturing soil and submerged soil in a river (A); A stocking preparation step (b) of setting the breeding water temperature in the sorting tank to be the same as the water temperature at the time of catching land and downstream in the step (a), and installing a separation device for blackfish that can float on the surface of the sorting tank; The land streams caught in step (a) are stocked in the sorting tank prepared in step (b), and the water temperature in the sorting tank is lowered at a rate of 1 to 2 ° C / day and maintained at 1 to 5 ° C for 10 to 20 days Separation and sorting step (c) including a separation step and a sorting step of catching the black crayfish that are clustered on the inner wall of the sorting tank and the separation device after the separation step is completed; After stocking the blackbirds selected in the step (c) in a breeding tank made at the same water temperature as the sorting tank, the water temperature in the breeding tank is raised at a rate of 1 to 2℃/day, and then kept at 10 to 15℃ until they are molted. Poran induction step (D) in which the breeding water temperature is raised at a rate of 1 to 2 ° C / day and maintained at 20 to 25 ° C to confirm incubation after confirming mass ecdysis in the breeding tank; Plaster hatching and breeding step (E) of transferring and stocking the new prawns that have passed step (D) into a main breeding tank to incubate and breed postlarvae; It consists of a harvesting step (f) of performing harvesting by converting the water flow direction of the main breeding tank in the step (e) in a certain direction.

(A) Land and downstream capture stage

The earth and river catch step (a) of the present invention includes the step of catching earth and river by fishing activities in rivers and lakes. In the wild land and submersibles captured in the step of the present invention, string shrimp and prawns other than sabers may be mixed.

(B) Preparing for stocking

The stocking preparation step (b) of the present invention includes the step of setting the water temperature of the breeding water stored in the sorting tank to be the same as the water surface captured by the land stream, and installing a saberfish separation device that can float on the surface of the breeding water in the sorting tank. The palaemon paucidens referred to in the present invention is a species of the genus Palaemon belonging to the family Shrimpidae, and lives in various areas with a wide range of environmental changes from freshwater areas to estuaries and marine areas, and about 13 species are known to be distributed in Korea. have.

With the same habits as prawns, when they are introduced into breeding facilities, they need food organisms in the early stages, so they prey on larvae instead of water fleas, and then eat the larvae that continuously shed during the growth process, making it difficult to increase the population of the prawns. Therefore, when harvesting broodstock for aquaculture, selection is essential as the two breeds with overlapping habitat areas are mixed. Previously, this was done manually, but it was difficult to distinguish the two species by appearance, as well as the disadvantage of requiring time and effort. Prior to harvesting and managing broodstock, screening of prawns and prawns should be carried out.

Fig. 2 shows the shrimp separator of the present invention, Fig. 3 shows a schematic view of the operation of the shrimp separator of the present invention, and Fig. 4 shows a perspective view of the sorting water tank in which the shrimp separator of the present invention is installed. The shrimp separator of the present invention has an oxygen transfer tube 100 installed perpendicularly to the bottom of the water tank in a tubular shape with both ends open, and a collection frame having a cross section forming a hemisphere so as to pass through the openings at both ends of the oxygen transfer tube and converging toward the transfer tube ( 200), and an oxygen generator 300 may be installed to extend inside the oxygen transfer pipe.

The oxygen transfer pipe 100 according to the present invention has a hollow tube shape, and the oxygen generator is installed to extend into the lower space inside the oxygen transfer tube. The oxygen generator can supply compressed air and can preferably be implemented as an air stone, but it is not limited thereto as long as the breeding water can move upward through the oxygen transfer pipe along with oxygen discharge.

The oxygen transfer pipe is installed perpendicularly to the bottom of the tank, and one or more moving holes 110 are formed on the lower side thereof, so that the new fish or breeding water moves into the moving pipe through the moving hole and rises along with the operation of the oxygen generator.

The collection frame 200 has a structure in which both ends are open and a depression portion narrowing toward the opening of the oxygen transport tube is formed, and one or more through holes are formed on the side surface, and the central portion is installed to pass through the openings at both ends of the oxygen transport tube. The collection frame may preferably form a hemisphere in cross-sectional structure, but is not limited thereto as long as it forms a curved portion that narrows in width toward the oxygen transfer pipe.

The collection frame includes an upper collection frame installed through the upper opening of the oxygen transport tube and a lower collection frame installed through the lower opening of the oxygen transport tube. An escape prevention net 210 is installed on the side of the upper collection frame facing the opening of the oxygen transfer pipe. The escape prevention net makes it easier to catch the shrimp in the sorting step to be described later by preventing the shrimp from escaping to the outside of the shrimp separator when the breeding water moves with the shrimp to the top of the oxygen transfer pipe due to the operation of the oxygen generator.

In the shrimp separator of the present invention, an oxygen transfer pipe is installed perpendicular to the bottom of the sorting tank in which breeding water is stored, and when oxygen (gas) is generated from the oxygen generator installed in the pipe, the mixture of oxygen and breeding water is lighter than the breeding water outside the pipe. The difference in specific gravity increases the breeding number in the tube.

In general, newbies have a habit of gathering at a low temperature similar to the winter season or swimming and distributing to places where water flows, so as shown in FIG. will be captured in At this time, the prawns and prawns that are caught together and stocked in the sorting tank do not cluster, form an area, and are distributed in the bottom of the tank (bottom of the tank), so that they can be easily separated from the shrimp. In addition, when selecting and capturing shrimps clustered on the lower side of the wall of the sorting tank in the shrimp selection step to be described later, prawns clustered on the bottom surface of the sorting tank may be mixed. In the case of installation, by being crowded on the bottom surface of the floating body, the mixing of the shrimp can be prevented by being spatially separated from the prawns clustered on the bottom surface of the sorting tank.

Figure 5 shows a cross-sectional view of an embodiment of the shrimp separator of the present invention. The saboteur separator according to an embodiment of the present invention has a structure in which the lower end is spaced apart from the bottom of the tank at a predetermined interval and the upper end can float on the surface of the sorting tank, and is installed vertically with the tank in a tubular shape with openings at both ends. The oxygen transfer tube 100 and the openings at both ends of the oxygen transfer tube form a hemisphere in cross section and a collection frame 200 whose width converges toward the transfer tube is installed, and an oxygen generator 300 is installed so as to extend inside the oxygen transfer tube It can be done.

One or more buoys (not shown) are installed on the upper collection frame according to the embodiment, so that the upper part of the shrimp separator of the present invention floats on the surface of the breeding water, and the frame below the upper collection frame can be installed so that it can infiltrate the breeding water. do.

The new fly separator according to an embodiment of the present invention is spaced apart from the bottom of the tank at a certain distance and additionally installed with a buoy at the top so that it can float inside the sorting tank, thereby increasing the separation efficiency by clustering the new fly distributed throughout the sorting tank. can

(C) Separation and sorting step

Separation and sorting step (c) of the present invention includes the separation step of stocking the land and submerged fish caught in step (a) in the sorting tank prepared in step (b) and breeding for a certain period of time, and after the completion of the separation step, the blackfish separating device and a sorting step of capturing the birds that are clustered on the inner wall of the sorting tank.

The separation step of the present invention includes the step of creating an artificial winter overwintering environment by lowering the water temperature in the sorting tank at a rate of 1 to 2 ° C / day and maintaining it at 1 to 5 ° C. When the water temperature of the sorting tank is maintained at 1 to 5 ° C, the prawns and prawns do not cluster in a benthic state with reduced vitality and form an area, whereas the same variety is sorted with the same variety in the upper part or bends such as the wall of the tank. It exhibits a characteristic of clustering in a dark place, so it is possible to easily sort out the purebred birds in the selection tank and breed them separately.

If the breeding water temperature is maintained below 1℃, mass mortality may occur due to the formation of ice crystals. There is a problem of low selectivity.

It is desirable to select when the water temperature of the sorting tank is maintained at 1 to 5 ° C for 10 to 20 days to form a colony of shrimp, which is maintained for less than 10 days. There is a problem that the selection rate is not good, such as being clustered in large numbers or having difficulties in sorting out the small size of the colony.

In addition, when maintained for a long period of more than 20 days and longer than 40 days, the colony of saberfish is maintained, but there is a problem in that economic efficiency is lowered. it is appropriate

In the stage of the present invention, it is possible to help form a colony by maximizing the habit of seeking hiding of the nocturnal saberfish by allowing appropriate natural light to come in without the need to create a complete blackout in the tank.

Feed supply can be minimized, or if the separation step is performed only once, feed supply can be omitted, or if a lot of prawns or prawns are mixed in the soil and subsea, prawns or prawns with high animal protein requirements in the sorting tank Shrimp can be fed to minimize saboteur predation.

While common sabers have the characteristics of clustering at 4 ° C or lower, which is similar to the winter season, shrimp require a benthic area of at least 4 × 4 cm (16 cm 2) or more per individual due to the presence of areas between individuals. At this time, since 1 m2 = 10,000 cm2, it is possible to breed 600 to 625 individuals/m2 (average around 0.66 g, 400 to 500 g/m2 production), which makes it less economical than saberfish.

The sorting step of the present invention may include a step of collecting the black crawfish that is collected on a wall surface and a crawfish separator after passing through the separation step. Figure 6 shows a schematic diagram in the sorting tank of new prawns and prawns before and after sorting according to the present invention. As shown in FIG. 6, before selection, shrimp and shrimp sporadically distributed in the sorting tank are distributed in clusters on the wall surface of the tank and the shrimp separator after screening, while shrimp are distributed sporadically in the benthic. It has the advantage of easy selection.

In addition, the step according to the present invention can be repeated to increase the selection rate of pure sabers. For example, after the first separation and sorting step, the selected sacks can be subjected to the second separation and sorting step again.

According to an embodiment of the present invention, after the first separation and selection step, the firstly selected saberfish is stocked in another selection tank and the second separation and selection step is performed. The separation step of the second separation and screening step maintains the same water temperature of 1 to 5 ° C as the first step, but maintains it for 5 to 10 days.

The first separation and sorting step of selecting and capturing the blackbirds with strong gregariousness among the soil and downstream by maintaining the water temperature in the sorting tank at 1 to 5°C for 10 to 20 days, and maintaining the sorted and captured blackbirds at 1 to 5°C. It may be composed of a second separation and selection step of re-selecting and capturing new birds with strong colonies by maintaining them for 5 to 10 days after stocking them in other selection tanks that are used. At this time, the screening rate of saebaengi is very high, with an effect of over 70-75%.

(D) Incubation stage

In the incubation induction step (D) of the present invention, after stocking the cockroaches selected in step (C) in a breeding tank set at the same water temperature as the selection tank, the water temperature in the breeding tank is raised at a rate of 1 to 2 ° C / day , Maintaining at 10 ~ 15 ℃ until molting, confirming mass molting in the breeding tank, and then raising the breeding water temperature at a rate of 1 ~ 2 ℃ / day and maintaining it at 20 ~ 25 ℃ to check eggs .

It is preferable to keep the water temperature of the breeding tank for breeding the selected sabers at the same level as the water temperature of the sorting tank, considering the characteristics of cold-blooded animals, since there is a risk of death due to shock if the water temperature difference between the water temperature of the sorting tank and the water temperature is large. .

In addition, as shown in FIG. 7, the breeding water of the breeding tank according to the present invention is preferably mixed with a blue food coloring to form a darker breeding water. The cockroach prefers a dark place, and when the environment is created through normal lighting to increase the egg rate by creating a dark environment, the stress of the cockroach increases when lighting is turned on. When the blue food coloring is mixed with the breeding water, the dark environment By providing the same environment from breeding to hatching, as well as composition, it is possible to reduce stress and increase the incubation rate.

From the water temperature of the maturation induction breeding tank above 10 ° C., feed of 2-3% of the weight of the stocking fish is supplied three times a week. As the feed, the feed quality such as the content ratio of crude protein is not greatly limited, and it is effective to supply a 2-5 mm sedimentary EP (Extruded pellet) feed.

Figure 8 shows the molting of the hatching stage of the present invention. Usually, saberfish dissociate at a water temperature of 10 to 15 ° C, and active swimming is observed in the opposite direction of the flow speed, and mass moulting is observed on the surface of breeding water due to preparation of eggs by mating. The greater the amount of shedding, the greater the amount of initial PL can be secured. It is possible to incubate 50 to 150 grains per mother brood, and if you calculate the average of 100 grains/individual, it is possible to calculate the first hatching amount before main breeding.

Figure 9 shows the eggs in the hatching stage of the present invention. After inducing mating and incubation through observation of the mass molting of the birds, the breeding tank is continuously raised at the same rate of 1 to 2 ° C / day, and then maintained at 20 to 20 ° C to determine whether the fertilized eggs are mature ( Light gray → dark brown) can be checked to confirm the incubation.

(E) PL hatching and rearing stages

The PL hatching step (E) of the present invention includes the step of hatching PLs by transferring the individuals whose eggs are confirmed in the rearing tank in step (D) to the main rearing tank and stocking them. The main breeding tank according to the present invention may be an indoor land tank or an open field farm. At this time, the hatched saebangi can be fed in the same way as the mother hatchling after 2 to 3 days of yolk absorption. It is desirable to install an aberration wheel so that the quality of breeding water in this breeding tank can be maintained at 4 ppm or more of dissolved oxygen, and to manage water supply and drainage so that 20 to 30% of water exchange per day is possible.

Figure 10 shows a schematic diagram of this breeding tank according to the present invention. The present breeding tank of the present invention has an open top, a storage space 410 for storing breeding water and breeding organisms is provided inside, and a water inlet 420 for supplying breeding water and a drain 430 are provided on one side of the tank. It is installed and a water flow is formed inside the storage space, and a harvesting device 440 in the form of a recessed part having a certain depth is formed at the bottom of the storage space.

The main breeding tank shown in FIG. 10 is implemented as an open-field farm, and the open-field farm forms a storage space 410 by digging the ground to a certain depth outdoors. Usually, it can be implemented by setting a place such as a rice field or a bank. At this time, vinyl or curtains are laid on the surface of the excavated ground, or the farm is partitioned with sieve nets to prevent bird interference or inflow of pirate organisms and pathogens. In the case of using a rice field in general, a storage space can be formed by digging the ground with a width of 2 to 3 m at least 0.6 m in the paddy field. In addition, it is possible to adjust the external weather environment by additionally installing a greenhouse in the open field farm.

A water inlet and a drain are installed on one side of the storage space. A water inlet is installed on one side, and a drain is installed on the side opposite to the water inlet, so that breeding water can flow in one direction, but it is not limited to this. have. About 1m of breeding water is obtained inside the storage space. A harvesting device 440 is installed on the bottom of the drain and the short-distance storage space. The harvesting device has a structure in which the upper part is open and is recessed downward to a certain depth. The upper opening of the harvesting device is opened in a harvesting step, which will be described later, to collect breeding organisms and facilitate the harvesting process.

(F) Harvest stage

The harvesting step (F) of the present invention includes the step of converting the water flow direction of the main breeding tank in step (E) to the harvest groove direction, and installing a blocking device in the harvesting device to perform harvesting.

Figure 11 shows a perspective view of the harvesting device and the blocking device during the harvesting step of the present invention, Figure 12 shows a cross-sectional view of the harvesting device and the blocking device. In the blocking device 450 of the present invention, a vertical member is installed to face the harvesting device at a predetermined interval, and a blocking film having a size that can cover the size of the opening of the harvesting device is installed at the top of the vertical member.

As a result, a shade is formed in the harvesting device, and it is possible to form a space in which a bird that prefers a humid place can hide. Since the blackfish has a habit of moving along with the flow of water, it moves along the direction of the water flow and can be more easily collected in the harvesting device.

In addition, the harvesting device of the present invention is installed so that it can be fixed and separated from the bottom of the main breeding tank, so that it is easier to separate the collected prawns from the main breeding tank after the harvesting step according to the present invention.

Hereinafter, an experimental example according to the saebai harvesting method of the present invention will be described in detail.

<Experimental Example 1> Effect according to the maturation inducing method of the present invention

According to Experimental Example 1 of the present invention, 6 kg of prawns and 4 kg of prawns captured and selected from a river in Gochang-gun, Jeollabuk-do were stocked in a Φ4.8 m circular tank with a water temperature of 20 ° C. At this time, a 2 kW electric heater was installed in the circular water tank, and blackfish separators were installed at three locations.

After stocking prawns and prawns in a circular tank, feed was supplied at 5% of body weight/day for 20 days. For the feed, a feed exclusively for prawns was used, which was composed of 8% moisture, 50% crude protein, 7% crude fat, 24% carbohydrates (including crude fiber, etc.) and 11% ash.

The water temperature in the circular water tank was lowered to 4℃ at a rate of 1~2℃/day, which took 20 days. After maintaining the water temperature at 4 ° C. for 15 days, individuals clustered at the bottom of the circular water tank were selectively captured.

Figure 13 shows the separated shrimp (A) and shrimp (B) individuals according to Experimental Example 1 of the present invention. As shown in FIG. 13, during the sorting step, the shrimp are clustered and distributed on the tank wall and the shrimp separator, and the shrimp are distributed on the bottom of the tank, making it easy to separate. As a result of visually judging the selection rate of blackbirds among the captured individuals, the selection rate of blackbirds was estimated to be approximately 95%.

After stocking the selectively captured saberfish in another circular tank maintained at a water temperature of 4 ° C, the temperature was raised to 15 ° C at a rate of 1 to 2 ° C / day (takes 15 days), maintained for 15 days, and mass molted individuals were identified. . At this time, prawn-only feed was supplied at 1%/day of fish body weight.

The water temperature of the circular water tank was raised to 20 ° C at a rate of 1 to 2 ° C / day (it took 5 days). At this time, as a result of visual inspection, the nesting individuals of the new beetle occupied approximately 1/3 of all the new beetles. And the water temperature was maintained at 20 ℃ for 20 days, and the final 5.0 kg (around 0.03 g of sublarval weight) was caught. After that, it was observed until day 100, and after 100 days, 14.2 kg of sage was finally caught.

<Experimental Example 2> Effect according to the maturation inducing method of the present invention

In Experimental Example 2 of the present invention, after the first separation step and the first selection step, the second separation step and the second selection step were performed to confirm the maturation induction effect. In the same way as in Experimental Example 1, 6 kg of prawns and 4 kg of wild shrimps captured and selected from a river in Gochang-gun, Jeollabuk-do were stocked in a circular water tank with a water temperature of 20 ° C.

The water temperature in the circular water tank was lowered at the same rate of 1 to 2 °C/day to 4 °C, which took 20 days. After maintaining the water temperature at 4° C. for 15 days, the individuals clustered at the bottom of the circular water tank were first screened and captured.

The weight of the individual captured by the first selection was 4.5 kg. The individuals captured by the first selection were stocked in a circular tank maintained at 4° C. and maintained for 15 days, and the individuals clustered at the bottom of the circular tank were captured by the second selection. The weight of the individuals captured in the second selection was 4.4 kg. As a result of visually judging the selection rate of blackbirds among the individuals captured by secondary selection, the selection rate of blackbirds was estimated to be approximately 98%.

After stocking the selectively captured saberfish in another circular tank maintained at a water temperature of 4°C, the temperature was raised to 15°C at a rate of 1 to 2°C/day (takes 15 days), maintained for 15 days, and mass-molded individuals were identified. did At this time, prawn-only feed was supplied at 1%/day of fish body weight.

Next, the water temperature in the above circular water tank was raised to 20 ° C at a rate of 1 to 2 ° C / day (it took 5 days), maintained for 20 days, and finally 5.2 kg (around 0.03 g of sublard weight) was caught. . After that, it was observed up to 100 days, and after 100 days, 16.5 kg of the new bream was finally caught.

<Experimental Example 3> Maturation induction effect according to the existing method

In Experimental Example 3, the selection rate was confirmed by screening and capturing with the naked eye, which is an existing method. As in Experimental Example 3, 6kg of prawns and 4kg of shrimps captured and selected from the river in Gochang-gun, Jeollabuk-do were stocked in a circular water tank with a water temperature of 20 ° C. Then, among the land streams stocked in the circular tank, saberfish were visually selected and captured. As a result of visually judging the selection rate of blackbirds among the captured individuals, the selection rate of blackbirds was estimated to be approximately 60%.

Individuals visually selected and captured from the circular tank were stocked in another circular tank, lowered to 15 ° C at a rate of 1 ~ 2 ° C / day, and maintained for 15 days. .

Next, the water temperature in the above circular water tank was raised to 20 ° C at a rate of 1 to 2 ° C / day (it took 5 days) and maintained for 20 days. caught a lobster. After that, it was observed up to 100 days, and after 100 days, 4.1 kg of prawns and 5.7 kg of prawns were finally caught.

After the implementation of Experimental Examples 1 to 3, the selection rate according to Experimental Example 3, in which the blackfish was visually screened from the vomit stream, was as low as 60%, while the selection rate was very high as 95% in Experimental Example 1 and 98% in Experimental Example 2. has been measured In addition, the population of the finally captured saberfish was only 4.1 kg in the case of the comparative group, but it was measured as very high as 14.5 kg in Experiment 1 and 16.5 kg in Experiment 2.

The present invention catches land streams prior to breeding and solves the problem of difficulty in planning farming due to the small number of broodstock individuals due to the inclusion of prawns, etc. By providing this possible technology, it has industrial applicability as it contributes to the development of the shrimp aquaculture industry.

100: oxygen transfer pipe 110: transfer ball
200: collection frame 210: departure prevention net
300: oxygen generator
A: Shrimp B: Shrimp
410: storage space 420: water inlet
430: drainage 440: harvesting device
450: blocking device

Claims (3)

Forming a harvesting device with a structure in which the upper part is opened at the bottom of the tank in which the saber is accommodated and penetrated to a certain depth,
A plurality of vertical members are installed in the harvesting device to be spaced apart at regular intervals, and a barrier having a size wider than the opening area of the harvesting device is installed at the top of the vertical member, and the water flow direction is directed toward the harvesting device to harvest the new shrimp. Way delete delete

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