Shellfish culture system and culture method

Abstract

To provide a shellfish culture system and a culture method capable of reducing use rearing water and an energy cost and adjusting and maintaining a rearing environment to be optimal for growing of the shellfish, thereby shortening a manufacturing period and greatly reducing a running cost of an entire system.SOLUTION: A shellfish culture system 1 includes: a rearing tank 2 accommodating rearing water and the shellfish reared; a rearing water temperature adjusting tank 3 supplying the rearing water to the rearing tank; and an organism filtration tank 4; causes the rearing water to sequentially circulate in the rearing tank, a rearing water temperature adjusting tank, and the organism filtration tank; and takes in new rearing water from the outside. By a rearing water take-in mechanism of the rearing water temperature adjusting tank, 10 to 30% of new rearing water per one hour with respect to a total water amount of each water amount of the rearing tank, the rearing water temperature adjusting tank, and the organism filtration tank is taken in, and two to three times the total water amount per one hour is circulated.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a shellfish farming system and method, and more particularly to a shellfish farming system and method that can maintain an optimal shellfish farming environment while reducing farming costs. [Background technology]

[0002] Currently, land-based aquaculture of seafood is being carried out all over Japan. However, shellfish, especially abalone, have a lower homeostasis ability than other fish and are vulnerable to changes in water quality, so they are mainly raised in seawater, and it has been considered difficult to cultivate them in a completely closed circulation system. In addition, shellfish grow slower than regular seafood, so there is also the problem of high production costs when farmed on land.

[0003] Thus, techniques have been proposed to farm abalone at low cost by using specific feed as a feed ingredient (Patent Documents 1 to 3). Patent Document 1 proposes using food ingredients that would normally be discarded as feed, while Patent Documents 2 and 3 propose providing an algae cultivation device within the system, purifying the farming water with the algae, and using the algae as feed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-159729 A [Patent Document 2] JP 2015-89348 A [Patent Document 3] JP 2016-208890 A Summary of the Invention [Problem to be solved by the invention]

[0005] The production costs of shellfish farming are mainly composed of equipment costs, labor costs, running costs, etc., among which the electricity costs for pumping account for a particularly large proportion. Therefore, the use of specific feed as in Patent Documents 1 to 3 does not provide a fundamental solution to reduce production costs, and from the perspective of cost-effectiveness, there is a need to develop a system that reduces production costs below the current level.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and has as its objective the provision of a shellfish farming system and method which can shorten the production period and significantly reduce the running costs of the entire system by reducing the amount of farming water used and energy costs, and by adjusting and maintaining the farming environment to be optimal for the growth of shellfish. [Means for solving the problem]

[0007] The shellfish farming system and method of the present invention have been made to solve the above technical problems, and are characterized by the following:

[0008] First, the shellfish farming system of the present invention includes a breeding tank for accommodating breeding water and the shellfish to be farmed; a breeding water temperature control tank for supplying the breeding water to the breeding tank; and Includes a biological filtration tank. A shellfish farming system in which the breeding water is circulated through the breeding tank, the breeding water temperature control tank, and the biological filtration tank in sequence, and new breeding water is taken in from the outside, The water volume ratio of the breeding water temperature adjustment tank and the biological filtration tank is 15 to 30 when the water volume of the breeding tank is 100; The breeding tank has a wastewater discharge mechanism for discharging wastewater, The breeding water temperature adjustment tank has a breeding water intake mechanism for taking in new breeding water from the outside, The breeding water intake mechanism of the breeding water temperature adjustment tank takes in 10 to 30% of new breeding water per hour based on the total water volume of the breeding tank, the breeding water temperature adjustment tank, and the biological filtration tank, and The method is characterized in that the rearing water is circulated in an amount of 2 to 3 times the total water volume per hour. Secondly, the shellfish farming system of the first invention is characterized in that a physical filtration device is provided between the breeding tank and the breeding water temperature adjustment tank. Thirdly, in the shellfish farming system according to the first or second invention, the temperature of the breeding water is adjusted to 15 to 25°C by a temperature adjustment device provided in the breeding water temperature adjustment tank. Fourthly, in the shellfish farming system of the first to third inventions above, the shellfish are abalone, and the breeding water is seawater or salt water adjusted to contain seawater components. Fifth, the method for cultivating shellfish of the present invention includes a breeding tank for accommodating breeding water and the shellfish to be cultivated; a breeding water temperature adjustment tank for supplying the breeding water to the breeding tank; and Includes a biological filtration tank. A shellfish aquaculture method using a shellfish aquaculture system in which the breeding water is circulated through the breeding tank, the breeding water temperature control tank, and the biological filtration tank in sequence, and new breeding water is taken in from the outside, The water volume ratio of the breeding water temperature adjustment tank and the biological filtration tank is 15 to 30 when the water volume of the breeding tank is 100; Discharge wastewater from the breeding tank; In the breeding water temperature adjustment tank, 10 to 30% of new breeding water is taken in per hour based on the total water volume of the breeding tank, the breeding water temperature adjustment tank, and the biological filtration tank. The method is characterized in that the rearing water is circulated at 2 to 3 times the total water volume per hour. Effect of the Invention

[0009] The shellfish farming system and method of the present invention reduce the amount of breeding water used and energy costs, and by adjusting and maintaining the breeding environment to be optimal for the growth of the shellfish, it is possible to shorten the production period and significantly reduce the running costs of the entire system, thereby achieving high production efficiency and energy conservation. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing one embodiment of a shellfish farming system of the present invention. [Diagram 2] 2 is a photograph of a test-scale actual shellfish farming system according to the embodiment of FIG. 1. [Diagram 3] This is a photograph of the test-scale shellfish farming system shown in Figure 2, viewed from another direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a shellfish farming system according to the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram of one embodiment of a shellfish farming system according to the present invention. The shellfish farming system 1 of this embodiment includes a breeding tank 2 for accommodating breeding water and breeding shellfish, a breeding water temperature adjustment tank 3, and a biological filtration tank 4.

[0012] Shellfish that can be cultivated in the shellfish farming system 1 of this embodiment include herbivorous snail shells such as abalone and turban shells belonging to the class Gastropoda of the phylum Mollusca that can generally be farmed on land using seawater or freshwater, and among these, abalone is particularly suitable for farming. When farming marine shellfish, seawater or saltwater adjusted to have seawater components is used as the farming water. In the following embodiment, a farming system for farming abalone using seawater as the farming water will be described.

[0013] (breeding tank) The breeding tank 2 used in this embodiment is suitable for land-based aquaculture facilities that can breed abalone stably without stress and that can circulate and drain seawater (breeding water).

[0014] The breeding tank 2 is provided with a wastewater discharge mechanism 21, which discharges wastewater containing abalone excrement, feed residues, and other wastewater generated within the breeding tank 2. The wastewater discharge mechanism 21 can be configured, for example, to discharge wastewater by overflow from a discharge outlet provided at a predetermined height within the tank, or to discharge solid precipitates and the like accumulated at the bottom of the breeding tank 2 from a discharge outlet provided at the bottom.

[0015] The amount of abalone to be reared in the rearing tank 2 can be set according to the growth stage and size of each individual abalone. For example, if the shipping size is set to about 80 mm in shell length, the bottom area of ​​the rearing tank 2 is set at 1 m 2 The amount of abalone to be reared is considered to be in the range of 6 to 10 kg per unit, and in this case, the number of abalone to be reared is considered to be 100 to 150. The abalone are fed in the rearing tank 2, and the amount of food to be fed is 100 kg per unit area of ​​the rearing tank 2. 2 A maximum feeding limit of 100 g / day per animal may be considered.

[0016] (Breeding water temperature control tank) The breeding water temperature adjustment tank 3 is a tank for adjusting the seawater to be introduced into the breeding tank 2 to an optimal condition, and is a tank in which the seawater from the breeding tank 2 is circulated and introduced, the water quality and temperature are adjusted, and the water is further circulated.

[0017] The breeding water temperature adjustment tank 3 has a breeding water intake mechanism 31 that takes in new seawater from outside, adjusts the quality and temperature of the new seawater, and supplies it to the breeding tank 2. In other words, the breeding water temperature adjustment tank 3 forms a semi-circulation system with circulating water from the breeding tank 2 and newly taken-in seawater from outside. The breeding water intake mechanism 31 is provided with a flow meter for monitoring the inflow rate per given time, and a valve for controlling the inflow rate.

[0018] The breeding water temperature adjustment tank 3 is equipped with a foam treatment device 32 that separates and removes fine solid matter, and a temperature adjustment device 33 that adjusts the temperature of the seawater, in order to adjust the circulating seawater from the breeding tank 2 and new seawater taken in from outside to optimal seawater for breeding.

[0019] (Foam treatment device) The foam treatment device 32 is a device installed to remove foreign matter contained in new seawater taken in from the outside and any foam that has formed.A water tank for foam removal processing can be provided within the breeding water temperature control tank 3, and the foam treatment device 32 can be disposed within this tank.

[0020] (Temperature adjustment device) The temperature adjustment device 33 is provided to adjust the temperature of the circulated seawater and newly introduced seawater to a predetermined temperature by heating and cooling, and a commonly known temperature adjustment device can be used. Specifically, from the viewpoint of ease of installation, etc., a throw-in type temperature adjustment chiller for both heating and cooling is preferably used. In addition, the rearing water temperature adjustment tank 3 is provided with a discharge mechanism 34 for discharging wastewater containing foreign matter and the like removed by the foam treatment device 32.

[0021] The water volume of the breeding water temperature regulating layer 3 in this embodiment is a ratio of 15 to 30 when the water volume of the breeding tank 2 is taken as 100. For example, when the water volume of the breeding tank 2 is 1000L, the breeding water temperature regulating layer 3 is in the range of 150 to 300L.

[0022] (biological filtration tank) In the shellfish farming system 1 of this embodiment, a biological filtration tank 4 with a biological filtration material 41 installed therein is provided downstream of the breeding water temperature adjustment tank 3, i.e., between the breeding water temperature adjustment tank 3 and the breeding tank 2.

[0023] The biological filter material 41 is a filter material capable of colonizing bacteria that decompose nitrogen compounds such as ammonia in seawater generated by abalone excrement and leftover food, and can continuously improve the water quality of seawater by predation of the bacteria colonized on the biological filter material 41. It is also preferable that the biological filter material 41 itself has a pH adjustment function. By providing the biological filter tank 4, it is possible to improve the survival rate and growth of the abalone being cultivated.

[0024] Taking into consideration the amount of seawater passing through and the efficient ability of the biological filtering material 41 to remove harmful components, the water volume of the biological filtration tank 4 is in the range of 15 to 30 L when the water volume of the breeding tank 2 is 100 L. For example, when the water volume of the breeding tank is 1000 L, the water volume of the biological filtration tank 4 is in the range of 150 to 300 L.

[0025] Furthermore, the amount of biological filtration material 41 introduced relative to the above water volume is usually about half the volume of the water in the biological filtration tank 4. That is, when the water volume in the biological filtration tank 4 is 150 L, the amount of biological filtration material 41 introduced is considered to be about 75 L.

[0026] (Circulation pump) In the shellfish farming system 1 of this embodiment, the breeding tank 2 and the breeding water temperature adjustment tank 3 are connected by piping, and the piping is provided with a circulation pump 5 and a circulating water flow meter 51. The operation of the circulation pump 5 is controlled so that the seawater in the system is always circulated under predetermined conditions.

[0027] In addition to the above basic configuration, the shellfish farming system 1 of this embodiment is also provided with a physical filtration device 6. The physical filtration device 6 is made up of a filter for removing abalone excrement and residual food that have not been completely removed by the wastewater discharge mechanism 21 of the breeding tank 2, and can be provided inside the breeding tank 2, between the breeding tank 2 and the breeding water temperature adjustment tank 3, or inside the breeding water temperature adjustment tank 3. A plurality of physical filtration devices 6 can also be provided. Specific examples of the physical filtration device 6 that can be used include a sedimentation tank, a drum filter, and a cyclone-type screen filter.

[0028] In the shellfish farming system 1 of this embodiment, seawater can be circulated to the breeding water temperature control tank 3, the biological filtration tank 4, and the breeding tank 2 by sequentially circulating the water by overflowing the tanks by taking advantage of the difference in height between the tanks, as shown in FIG. 1, or by using a separate pump to circulate the water.

[0029] According to the shellfish farming system 1 of this embodiment configured as described above, it is possible to reduce the construction costs of the system and to adjust and maintain the breeding environment so as to be suitable for the growth of abalone.

[0030] In the shellfish farming system 1 of the present embodiment, new seawater is usually pumped from a separate tank for new seawater and taken into the breeding water temperature adjustment tank 3, but the energy cost for pumping usually accounts for a large proportion of the energy cost associated with the operation of the system. On the other hand, if the amount of new seawater taken in is restricted to an extremely small amount, the quality of the circulating seawater will deteriorate, causing a decrease in the survival rate of the abalone. Therefore, in the present invention, in order to maintain good water quality suitable for breeding abalone while minimizing the operating energy cost of the system, the amount of new seawater taken in to be introduced into the breeding water temperature adjustment tank 3 and the amount of seawater circulated within the system are specified.

[0031] In this embodiment, the amount of newly added seawater is in the range of 10 to 30% per hour of the total amount of water in the breeding tank 2, the breeding water temperature adjustment layer 3, and the biological filtration tank 4. For example, in a system in which the amount of water in the breeding tank 2 is 1000 L, the amount of water in the breeding water temperature adjustment layer 3 is 150 L, and the amount of water in the biological filtration tank 4 is 150 L, the total amount of water is 1300 L, so the amount of new seawater taken in is 130 to 390 L per hour.

[0032] Furthermore, the wastewater discharge mechanism 21 of the breeding tank 2 and the drainage mechanism 34 of the breeding water temperature control layer 3 discharge approximately the same amount of wastewater as the new seawater taken in, so that the amount of circulating seawater is kept approximately constant.

[0033] The amount of seawater circulated in the shellfish farming system 1 of this embodiment is two to three times the total amount of water in the breeding tank 2, the breeding water temperature adjustment layer 3, and the biological filtration tank 4 per hour. For example, when the total amount of water in the breeding tank 2, the breeding water temperature adjustment layer 3, and the biological filtration tank 4 is 1300 L, the amount of circulating water per hour is 2600 to 3900 L.

[0034] Furthermore, it is preferable to adjust the temperature of the circulating seawater to 15 to 25° C. by the temperature adjustment device 33 of the breeding water temperature adjustment tank 3. Also, considering the relationship between the outside air temperature and the temperature of the circulating water, it is preferable to adjust the temperature to 25° C. or lower in summer (June to September) and 15° C. or higher in winter (December to March).

[0035] By setting the amount of new seawater taken in and the amount of seawater circulating in the system under the above conditions, the circulating seawater can be properly treated in the biological filtration tank 4, and seawater of optimal conditions can be supplied to the breeding tank 2 in which the abalone are kept. In addition, the energy costs associated with operating the system can be reduced.

[0036] The above describes the shellfish farming system 1 of the present invention based on an embodiment, but the shellfish farming system of the present invention is not limited to the above embodiment, and various modifications are possible within the scope that does not deviate from the gist of the system.

[0037] For example, in the above embodiment, an abalone farming system was described using seawater as the breeding water, but the system can also be applied to the farming of other marine algae-eating shellfish using seawater, or the farming of algae-eating shellfish using freshwater as the breeding water.

[0038] Furthermore, the shellfish cultivation method of the present invention is a cultivation method that uses the above-mentioned shellfish cultivation system 1 of the present invention, and specifically, it is a cultivation method that uses a shellfish cultivation system that includes a breeding tank 2 that contains breeding water and the shellfish to be cultivated, a breeding water temperature adjustment tank 3 that supplies breeding water to the breeding tank 2, and a biological filtration tank 4, and circulates breeding water through the breeding tank 2, the breeding water temperature adjustment tank 3, and the biological filtration tank 4 in sequence, while also taking in new breeding water from outside.

[0039] The water volumes of the breeding water temperature adjustment tank 3 and the biological filtration tank 4 are adjusted to a water volume ratio of 15 to 30, assuming the water volume of the breeding tank 2 to be 100. In addition, wastewater is discharged from the breeding tank 2, and new breeding water is taken in from outside into the breeding water temperature adjustment tank 3.

[0040] In addition, the breeding water temperature adjustment tank 3 takes in 10 to 30% of new breeding water per hour based on the total water volume of the breeding tank 2, the breeding water temperature adjustment tank 3, and the biological filtration tank 4, and circulates breeding water at 2 to 3 times the total water volume per hour.

[0041] According to the shellfish farming method of the present invention, the shellfish can be grown efficiently and reliably, and desired shellfish can be steadily supplied to the market. EXAMPLES

[0042] The shellfish farming system of the present invention will be described in detail below with reference to examples. However, the present invention is not limited to the following examples.

[0043] For the shellfish farming system configured as shown in Figure 1, an actual medium-scale test tank shellfish farming system was constructed as shown in Figures 2 and 3 using the following for each tank and equipment.

[0044] Breeding tank (1t square tank: internal dimensions: width / 1800, depth / 900, height / 710 (mm) volume: 1150L, ​​water volume: 570L (water depth 350mm)) At time of capture: Abalone (shell length 35 mm, 500 pieces)

[0045] Water temperature control tank (inner dimensions: width 630, depth 430, height 370 (mm) volume: 100 L, water volume: 95 L (depth 350 mm), equipped with foam treatment device and temperature control device) Foam treatment device (internal foam separator: H&S HS-850 Protein Skimmer) Temperature control device (temperature control chiller: Lacey FZ-601HPN immersion cooler (for both heating and cooling))

[0046] Biological filtration tank (inner dimensions: width / 740, depth / 450, height / 450 (mm) volume: 150L, ​​water volume: 135L (water depth 405mm)) Uses 70L of biological filter material (Powerhouse Basic Hard Type L, made by Pacific Cement)

[0047] Circulation pump (total tank circulation): (Racy RMD-551 magnetic pump Circulation flow rate: Maximum 40 L / min (30-35 L / min during testing) A flow meter is installed so that the circulation flow rate can be measured. Physical filtration device (Sunhope AKY38840 cyclone screen filter)

[0048] <Example> In the shellfish farming system 1, the amount of newly added seawater was adjusted to 80 L per hour, which is 10% of the total water volume (800 L) of the breeding tank 2, breeding water temperature adjustment tank 3, and biological filtration tank 4. Approximately the same amount of circulating seawater as the added seawater was discharged by overflow from the breeding tank 2 and by the discharge mechanism 34 from the breeding water temperature adjustment tank 3. The amount of circulating seawater in the system was circulated by adjusting the operating rate of the circulation pump 5 so that it was 2000 L per hour, which is 2.5 times the total water volume (800 L) of the breeding tank 2, breeding water temperature adjustment tank 3, and biological filtration tank.

[0049] <Comparative Example> As a comparative example, in the shellfish farming system 1 of the above embodiment, the operation of the circulation pump 5 was stopped to prevent seawater from circulating, and fresh seawater was continuously supplied at 700 L per hour to create a free-flowing state.

[0050] Abalone were raised under the conditions of the above-mentioned Examples and Comparative Examples, and the condition of the abalone was observed every 30 days from mid-December to mid-March of the following year, while the energy consumption of the entire system was confirmed from late July to mid-March of the following year. The detailed operating conditions and results of the Examples and Comparative Examples are shown below.

[0051] <Energy consumption in the example (semi-circulation)> (calculated value from measurement results) A cooling device was used in the summer (June to September) and a heating device was used in the winter (December to March) (assuming 22 yen / kwh). (1) The cooling system (cooling the raw water temperature down by 3°C) was used for four months in the summer, with a daily operating rate of 50%. 1 hour of power usage / electricity bill = 0.5kwh / 11.00 yen, 4 months = 1,440kwh / 31,680 yen (2) The heating device (heating the raw water temperature +3℃) was used for four months in winter, with a daily operating rate of 40%. 1 hour of power usage / electricity bill = 0.4kwh / 8.80 yen, 4 months = 1,152kwh / 25,344 yen (3) Foam separator (operates continuously) 1 hour of power usage / electricity bill = 0.04kwh / 0.88 yen, 1 year = 350kwh / 7,700 yen (4) Circulation pump in the biological filtration tank from the biological filtration tank (outlet) to the biological filtration tank (inlet) (approximately 15 L / min, constantly running) 1 hour of power usage / electricity bill = 0.04kwh / 0.88 yen, 1 year = 350kwh / 7,700 yen (5) Circulation pump from the breeding tank to the foam separation tank (approx. 40 L / min., constantly running) 1 hour of power usage / electricity bill = 0.15kwh / 3.30 yen, 1 year = 1,300kwh / 28,600 yen Total electricity usage: (1)+(2)+(3)+(4)+(5)=4,592kwh per year Total electricity usage cost: (1)+(2)+(3)+(4)+(5)=approx. 100,000 yen per year

[0052] <Energy consumption in comparison example (flowing water)> (calculated value from actual results) (1) The cooling system (cooling the raw water temperature down by 3°C) was used for four months in the summer, with a daily operating rate of 70%. 1 hour power usage / electricity bill = 7kwh / 1,540 yen, 4 months = 20,160kwh / 443,520 yen (2) The heating device (heating the raw water temperature +3℃) was used for four months in winter, with a daily operating rate of 50%. 1 hour power usage / electricity bill = 3.5kwh / 770 yen, 4 months = 10,080kwh / 221,760 yen Total electricity usage: (1)+(2)=30,240kwh per year Total electricity usage cost: (1) + (2) = approx. 660,000 yen per year

[0053] From the above results, it was confirmed that the energy consumption (electricity used) of the entire system was about 6.6 times that of the Example under the conditions of the Comparative Example. On the other hand, it was confirmed that the growth condition of the abalone from mid-December to mid-March of the following year was very good in both the Example and the Comparative Example.

[0054] From these findings, it was confirmed that the shellfish farming system of the present invention makes it possible to adjust and maintain the rearing conditions to be optimal for growth, while also significantly reducing the running costs of the entire system, thereby enabling high production efficiency and energy savings. [Explanation of symbols]

[0055] 1 Shellfish farming system 2. Breeding tank 21 Wastewater discharge mechanism 3 Breeding water temperature control tank 31 Water intake mechanism 32 Foam treatment equipment 33 Temperature adjustment device 34 Ejection mechanism 4 Biological filtration tank 41 Biological filter media 5 Circulation Pump 51 Flow meter for circulating water 6 Physical filtration device

Claims

1. A breeding tank for accommodating breeding water and breeding shellfish; a breeding water temperature control tank for supplying the breeding water to the breeding tank; and Includes a biological filtration tank. A shellfish farming system in which the breeding water is circulated through the breeding tank, the breeding water temperature control tank, and the biological filtration tank in sequence, and new breeding water is taken in from the outside, The water volume ratio of the breeding water temperature adjustment tank and the biological filtration tank is 15 to 30 when the water volume of the breeding tank is 100, The breeding tank has a wastewater discharge mechanism for discharging wastewater, The breeding water temperature adjustment tank has a breeding water intake mechanism for taking in new breeding water from the outside, A breeding water intake mechanism of the breeding water temperature adjustment tank takes in 10 to 30% of new breeding water per hour based on the total water volume of the breeding tank, the breeding water temperature adjustment tank, and the biological filtration tank; A shellfish farming system characterized in that the amount of breeding water circulated per hour is 2 to 3 times the total water volume.

2. 2. The shellfish farming system according to claim 1, characterized in that a physical filtration device is provided between the breeding tank and the breeding water temperature adjustment tank.

3. 2. The shellfish farming system according to claim 1, characterized in that the temperature of the breeding water is adjusted to 15 to 25°C by a temperature adjustment device provided in the breeding water temperature adjustment tank.

4. 2. A shellfish farming system according to claim 1, characterized in that the shellfish are abalone, and the breeding water is seawater or saltwater adjusted to contain seawater components.

5. A breeding tank for accommodating breeding water and breeding shellfish; a breeding water temperature control tank for supplying the breeding water to the breeding tank; and Includes a biological filtration tank. A shellfish farming method using a shellfish farming system in which the breeding water is circulated through the breeding tank, the breeding water temperature control tank, and the biological filtration tank in sequence, and new breeding water is taken in from the outside, The water volume ratio of the breeding water temperature adjustment tank and the biological filtration tank is 15 to 30 when the water volume of the breeding tank is 100, Discharge wastewater from the breeding tank; In the breeding water temperature adjustment tank, 10 to 30% of new breeding water is taken in per hour based on the total water volume of the breeding tank, the breeding water temperature adjustment tank, and the biological filtration tank; A shellfish farming method, characterized in that the amount of rearing water circulated per hour is 2 to 3 times the total water volume.

Images