Crustacean breeding water

Abstract

To provide water for raising crustaceans, which reliably improves the survival rate of crustaceans compared with the case where natural seawater is used. [Solution] Crustacean breeding water 10 is characterized by containing, as solute masses per 1 L of breeding water, 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3. Crustacean breeding water 10 contains, as solute masses per 1 L of breeding water, 3896.9 to 5268.7 mg of Na + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K. + and may include:

Description

[Technical Field]

[0001] The present invention relates to a crustacean breeding water used for crustacean farming. [Background technology]

[0002] Research has traditionally been conducted into the breeding water used in land-based crustacean aquaculture. For example, mitten crabs, a type of crustacean, are generally hatched using natural seawater, but securing natural seawater is difficult in inland areas such as Tochigi and Gunma prefectures, making hatching difficult. For this reason, artificial seawater is needed that can enable crustacean hatching even in areas far from the sea. Furthermore, in conventional aquaculture using natural seawater, the survival rate of mitten crabs remains at around 30%. Therefore, in order to improve the production efficiency of land-based crustacean aquaculture, it is important to adjust the breeding water to contain components suitable for crustacean growth and prevent a decline in survival rate.

[0003] Patent Document 1 discloses a breeding water for efficiently producing shrimp. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-043252 Summary of the Invention [Problem to be solved by the invention]

[0005] According to Patent Document 1, the components of shrimp farming water include 3 The publication discloses rearing water containing 3115g of sodium chloride, 2098g of magnesium chloride, 410g of calcium chloride, 82g of sodium bicarbonate, 590g of sodium sulfate, 109g of potassium chloride, and 5g of strontium chloride per 100ml. However, the publication does not disclose the specific amounts of these components that can suppress the decline in the survival rate of crustaceans compared to when natural seawater is used, and there is a problem that it is not possible to reliably suppress the decline in the survival rate of crustaceans.

[0006] The present invention has been devised in view of the above-mentioned problems, and its object is to provide crustacean rearing water that reliably improves the survival rate of crustaceans compared to when natural seawater is used. [Means for solving the problem]

[0007] The crustacean breeding water of the first invention is used for breeding crustaceans, and is characterized by containing, as solute masses per liter of breeding water, 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3.

[0008] The crustacean breeding water in the second invention is used for breeding crustaceans, and has a solute mass per 1 L of the breeding water of 3896.9 to 5268.7 mg Na. + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K. + and [Effects of the Invention]

[0009] According to the first and second inventions, the survival rate of crustaceans can be increased to 60% or more compared to when natural seawater is used, thereby ensuring a more reliable improvement in the survival rate of crustaceans compared to when natural seawater is used. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing an example of a breeding device that uses the breeding water of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] An example of a crustacean rearing water 10 according to an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the components in each drawing are shown schematically for the purpose of explanation, and the size of each component and the size comparison between components may differ from those shown in the drawings.

[0012] (Crustacean breeding water 10) An example of the crustacean breeding water 10 in this embodiment will be described with reference to Figure 1. The crustacean breeding water 10 is used for cultivating crustaceans, for example, using an aquaculture system 100. Here, crustaceans include crabs, shrimp, etc.

[0013] The aquaculture system 100 is an apparatus for cultivating crustaceans as a target for aquaculture. The aquaculture system 100 is used, for example, for land-based aquaculture, in areas where it is difficult to obtain seawater or river water.

[0014] The aquaculture system 100 uses, for example, a closed circulation system that circulates the crustacean breeding water 10. Hatching crustaceans (especially baby crabs) requires a large amount of energy to maintain the water quality while keeping the water temperature at approximately 20°C. Therefore, by adopting a closed circulation system, the aquaculture system 100 can reduce the amount of energy consumed in cultivating crustaceans, thereby reducing the cost of hatching crustaceans and carbon dioxide emissions. Furthermore, adopting a closed circulation system makes it easier to maintain the component ratio of the crustacean breeding water 10 at conditions suitable for crustacean breeding, thereby improving the survival rate.

[0015] The aquaculture system 100 includes an accommodation unit 1 that accommodates, for example, crustacean breeding water 10. The aquaculture system 100 may further include a physical filtration device 2, a biological filtration device 3, and a sterilization device 4. The components of the aquaculture system 100 are connected to each other by well-known water supply pipes, for example, polyethylene pipes. The crustacean breeding water 10 flows from the accommodation unit 1 to the physical filtration device 2 via a water supply pump P, for example, installed in the center of the bottom of the accommodation unit 1. The crustacean breeding water 10 then overflows from the physical filtration device 2 and flows into the biological filtration device 3, then overflows from the biological filtration device 3, passes through the sterilization device 4, and then returns to the accommodation unit 1.

[0016] The crustacean breeding water 10 is contained in the storage unit 1 and is used to cultivate the crustaceans in the storage unit 1. The salinity of the crustacean breeding water 10 is adjusted to, for example, about 1.5 to 2.0% by mass. In other words, compared to artificial seawater, which is adjusted to a salinity of 3.0% by mass, equivalent to seawater, the amount of salt used can be reduced, thereby reducing the cost of culturing crustaceans.

[0017] The crustacean breeding water 10 contains, as a main component, for example, Na + (sodium ion), Mg 2+ (Magnesium ion), Ca 2+ (Calcium ion), K + (potassium ions). The crustacean breeding water 10 contains SO4 2- (sulfate ions) may be included.

[0018] The crustacean breeding water 10 contains, for example, the following solute masses per liter of breeding water: 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3. Compared to using natural seawater, the survival rate of crustaceans can be increased to 60% or more. This significantly improves the survival rate of crustaceans compared to using natural seawater.

[0019] It should be noted that, for example, when the mass of solutes in the crustacean breeding water 10 is less than 11.454 g or more than 15.486 g per liter of water, NaCl has not been confirmed to achieve a survival rate of 60% or more, raising concerns that the survival rate of crustaceans may not be reliably improved. Furthermore, when the mass of solutes in the crustacean breeding water 10 is less than 0.969 g or more than 1.384 g per liter of water, MgCl2 has not been confirmed to achieve a survival rate of 60% or more, raising concerns that the survival rate of crustaceans may not be reliably improved. Furthermore, when the mass of solutes in the crustacean breeding water 10 is less than 1.392 g or more than 1.943 g per liter of water, MgSO4 has not been confirmed to achieve a survival rate of 60% or more, raising concerns that the survival rate of crustaceans may not be reliably improved. Furthermore, when the mass of solutes in the crustacean breeding water 10 is less than 0.451 g or more than 0.659 g per liter of water, for example, when the mass of CaCl2 is less than 0.451 g or more than 0.659 g per liter of water, it has not been confirmed that a survival rate of 60% or more can be achieved, raising concerns that the survival rate of crustaceans cannot be reliably improved. Furthermore, when the mass of solutes in the crustacean breeding water 10 is less than 0.309 g or more than 0.429 g per liter of water, for example, when the mass of solutes in the crustacean breeding water 10 is less than 0.085 g or more than 0.118 g per liter of water, it has not been confirmed that a survival rate of 60% or more can be achieved, raising concerns that the survival rate of crustaceans cannot be reliably improved.

[0020] The crustacean breeding water 10 has a solute mass of 3896.9 to 5268.7 mg Na per 1 L of breeding water. + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K. + In this case, the survival rate of crustaceans can be increased by 60% or more compared to when natural seawater is used. This ensures a definite improvement in the survival rate of crustaceans compared to when natural seawater is used.

[0021] The crustacean breeding water 10 contains, for example, Na as the mass of solute per 1 L of breeding water. + If the amount of solute is less than 3896.9 mg or more than 5268.7 mg, it has not been confirmed that the survival rate of 60% or more can be achieved, and there is a concern that the survival rate of crustaceans cannot be reliably improved. 2+ If the amount of Ca is less than 515.7 mg or more than 731.4 mg, it has not been confirmed that the survival rate of 60% or more can be achieved, and there is a concern that the survival rate of crustaceans cannot be reliably improved. 2+ If the amount of solute is less than 209.7 mg or more than 306.4 mg, it has not been confirmed that the survival rate of 60% or more can be achieved, and there is a concern that the survival rate of crustaceans cannot be reliably improved. + When the amount is less than 150.4 mg or more than 208.8 mg, a survival rate of 60% or more has not been confirmed, and there is concern that a reliable improvement in the survival rate of crustaceans cannot be achieved.

[0022] <Containment Unit 1> The accommodating unit 1 accommodates crustacean breeding water 10 and crustaceans to be cultured. The accommodating unit 1 is, for example, a fish preserve or aquarium for accommodating crustaceans.

[0023] <Physical filtration device 2> The physical filtration device 2 is a device that removes suspended matter and sediments contained in the crustacean breeding water 10 by physical methods, thereby maintaining the transparency of the crustacean breeding water 10. The physical filtration device 2 may be provided outside the housing unit 1 or inside the housing unit 1. The physical filtration device 2 may perform physical filtration of the crustacean breeding water 10 using, for example, a known filter or the like.

[0024] <Biological filtration device 3> The biological filtration device 3 is a device that maintains an appropriate environment for the growth of crustaceans by reducing ammonia, nitrite, etc. contained in the crustacean breeding water 10 to 0.25 ppm or less. The biological filtration device 3 may be connected to the outside of the housing unit 1 or may be provided inside the housing unit 1. The biological filtration device 3 may perform biological filtration of the crustacean breeding water 10 using a known microbial carrier that carries microorganisms such as bacteria.

[0025] <Sterilizer 4> The sterilizer 4 is a device that sterilizes the crustacean breeding water 10. The sterilizer 4 may be connected to the outside of the housing unit 1 or may be provided inside the housing unit 1. The sterilizer 4 may be, for example, a known ultraviolet sterilization and purification device, an ozone generator, a hypochlorous acid water generator, or the like.

[0026] According to this embodiment, the crustacean breeding water 10 contains, as solute masses per liter of breeding water, 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3. This allows for a survival rate of 60% or more for crustaceans compared to when natural seawater is used. This ensures a significant improvement in the survival rate of crustaceans compared to when natural seawater is used.

[0027] According to this embodiment, the crustacean breeding water 10 contains 3896.9 to 5268.7 mg of Na as a solute mass per 1 L of breeding water. + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K. + As a result, the survival rate of crustaceans can be increased by 60% or more compared to when natural seawater is used. This ensures a definite improvement in the survival rate of crustaceans compared to when natural seawater is used. [Example]

[0028] The relationship between the crustacean rearing water 10 and the survival rate of crustaceans will be specifically described below in detail with reference to examples of the present invention and comparative examples in which the above-described embodiment is used.

[0029] <Experimental conditions for survival rate of crustaceans> In this experiment, the survival rate of crustaceans in the crustacean breeding water 10 in which crustaceans are raised was compared for each combination of the amount of solute added per liter of breeding water: NaCl, MgCl2, MgSO4, CaCl2, KCl, and NaHCO3, to confirm the production efficiency of the crustaceans.

[0030] In this experiment, Japanese mitten crabs were used as crustaceans. Specifically, zoea (young crabs), which are the larvae after hatching, were used. The number of zoea used in each experiment was approximately 300,000 to 800,000.

[0031] As the storage section 1, a water tank having a diameter of 3 m and a height of 1.2 m (water level 1.0 m) was used.

[0032] The physical filtration device 2 used was a device with a filter of 200 mesh (pore size of approximately 75 micrometers). This device was operated at a processing capacity of 30 t / hour. During the physical filtration, the filter was backwashed for 20 to 30 seconds at intervals of 30 or 60 minutes. The biological filtration device 3 was a device with a main body of 0.5 to 1.0 m 3 , carrier volume 0.17~0.34m 3 A known ultraviolet sterilization device was used as the sterilization device 4. This device was operated at a sterilization treatment capacity of 10 to 15 t / hour.

[0033] The feed used to feed crustaceans was Brachionus plicatilis and Nannochloropsis. The feed supply amounts for juvenile crabs are shown below as an example. For the zoea from 0 to 6 days after hatching (hereinafter referred to as the "Z1 stage"), Brachionus plicatilis was supplied at a rate of 1 million per ton and Nannochloropsis at a rate of 50 million per ton. For the zoea from 7 to 12 days after the first molt (hereinafter referred to as the "Z2 stage"), Brachionus plicatilis was supplied at a rate of 1 million per ton and Nannochloropsis at a rate of 70 million per ton. After that, they go through the zoea stage from 13 to 19 days after the second molt (hereinafter referred to as the "Z3 stage"), the zoea stage from 20 to 25 days after the third molt (hereinafter referred to as the "Z4 stage"), and the zoea stage from 25 to 30 days after the fourth molt (hereinafter referred to as the "Z5 stage"), after which they become megalopas for approximately 30 days. As there is no commercially available feed specifically for mitten crabs, a feed for kuruma shrimp (crude protein content 53% by mass) was used instead for the compound feed used from the Z3 to Z5 stages. Specifically, 2 g / ton of compound feed for kuruma shrimp larvae, 1.5 million to 2 million rotifers / ton, and 100 million Nannochloropsis / ton were supplied.

[0034] The rearing environment for crustaceans was set at a rearing density of 15,000 fish / m 3 ~30,000 fish / m 3 The average weight per fish at each growth stage was approximately 0.13 mg in the Z1 stage, approximately 0.27 mg in the Z2 stage, approximately 0.5 mg in the Z3 stage, approximately 1 mg in the Z4 stage, approximately 1.8 mg in the Z5 stage, and approximately 5 mg in the megalopa. The temperature of the crustacean rearing water 10 was adjusted to a range of 18°C ​​to 23°C, the dissolved oxygen content to a range of 5.0 mg / L to 8.0 mg / L, and the pH to a range of 7.6 to 8.6. The crustacean rearing water 10 was circulated at a rate of 6 to 12 t / hour using a water pump P.

[0035] For crustacean breeding water 10, Cl - was 24.2 mg / L, and NO 3- was 40.7 mg / L, and Na + 11.5mg / L, Mg 2+ is 13mg / L, K+ is 1.5 mg / L, Ca 2+ is 15 mg / L, NH 4+ and NO 2- The salt concentration of the crustacean breeding water 10 was adjusted to 1.2 to 2.5 mass % by adjusting the amount of NaCl added.

[0036] The masses of solutes in the crustacean breeding water 10 compared in this experiment are as follows:

[0037] In Example 1 of the present invention, 15.272 g / L of NaCl, 1.291 g / L of MgCl, 1.856 g / L of MgSO, 0.659 g / L of CaCl, 0.412 g / L of KCl, and 0.113 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 5195.9mg / L, Mg 2+ 683.9mg / L, Ca 2+ was 306.4 mg / L, and K + was 200.5 mg / L.

[0038] In Example 2 of the present invention, 15.486 g / L of NaCl, 1.384 g / L of MgCl, 1.943 g / L of MgSO, 0.602 g / L of CaCl, 0.429 g / L of KCl, and 0.118 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 5268.7mg / L, Mg 2+ 731.4mg / L, Ca 2+ was 279.9 mg / L, and K + was 208.8 mg / L.

[0039] In Example 3 of the present invention, 11.454 g / L of NaCl, 0.969 g / L of MgCl, 1.392 g / L of MgSO, 0.494 g / L of CaCl, 0.309 g / L of KCl, and 0.085 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was+ 3896.9mg / L, Mg 2+ 515.7mg / L, Ca 2+ is 229.7 mg / L, K + was 150.4 mg / L.

[0040] In Example 4 of the present invention, 11.614 g / L of NaCl, 1.038 g / L of MgCl, 1.458 g / L of MgSO, 0.451 g / L of CaCl, 0.322 g / L of KCl, and 0.089 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 3951.3mg / L, Mg 2+ 548.6mg / L, Ca 2+ is 209.7 mg / L, K + was 156.7 mg / L.

[0041] In Comparative Example 1, 11.668 g / L of NaCl, 1.095 g / L of MgCl, 1.547 g / L of MgSO, 0.563 g / L of CaCl, 0.420 g / L of KCl, and 0.069 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 3969.8mg / L, Mg 2+ 372.5mg / L, Ca 2+ is 526.5 mg / L, K + was 191.4 mg / L.

[0042] In Comparative Example 2, 15.307 g / L of NaCl, 1.112 g / L of MgCl, 1.572 g / L of MgSO, 0.550 g / L of CaCl, 0.392 g / L of KCl, and 0.158 g / L of NaHCO were added to the solvent. + 5207.6mg / L, Mg 2+ 378.3mg / L, Ca 2+ is 534.7 mg / L, K + was 187.1 mg / L.

[0043] In Comparative Example 3, 13.975 g / L of NaCl, 1.771 g / L of MgCl, 2.536 g / L of MgSO, 0.586 g / L of CaCl, 0.380 g / L of KCl, and 0.112 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 4754.6mg / L, Mg 2+ 602.5mg / L, Ca 2+ is 862.8 mg / L, K + was 199.2 mg / L.

[0044] In Comparative Example 4, 14.908 g / L of NaCl, 1.364 g / L of MgCl, 1.925 g / L of MgSO, 0.774 g / L of CaCl, 0.403 g / L of KCl, and 0.116 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 5072.0mg / L, Mg 2+ 463.9mg / L, Ca 2+ is 654.9 mg / L, K + was 263.2 mg / L.

[0045] In Comparative Example 5, 13.225 g / L of NaCl, 1.075 g / L of MgCl, 1.520 g / L of MgSO, 0.525 g / L of CaCl, 0.558 g / L of KCl, and 0.093 g / L of NaHCO were added to the solvent. + 4499.4mg / L, Mg 2+ 365.9 mg / L, Ca 2+ was 517.2 mg / L, and K + was 178.6 mg / L.

[0046] In Comparative Example 6, 20.294 g / L of NaCl, 1.311 g / L of MgCl, 1.851 g / L of MgSO, 0.484 g / L of CaCl, 0.397 g / L of KCl, and 0.099 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 6904.3mg / L, Mg2+ was 446.1 mg / L, Ca 2+ is 629.8 mg / L, K + was 164.8 mg / L.

[0047] In Comparative Example 7, 9.222 g / L of NaCl, 1.159 g / L of MgCl, 1.637 g / L of MgSO, 0.468 g / L of CaCl, 0.339 g / L of KCl, and 0.111 g / L of NaHCO were added to the solvent. + 3137.5mg / L, Mg 2+ 394.3mg / L, Ca 2+ is 557.1 mg / L, K + was 159.3 mg / L.

[0048] In Comparative Example 8, 12.245 g / L of NaCl, 1.055 g / L of MgCl, 1.491 g / L of MgSO, 0.324 g / L of CaCl, 0.392 g / L of KCl, and 0.116 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 4166.1mg / L, Mg 2+ 358.9mg / L, Ca 2+ is 507.4 mg / L, K + was 110.1 mg / L.

[0049] In Comparative Example 9, 14.199 g / L of NaCl, 0.711 g / L of MgCl, 1.061 g / L of MgSO, 0.566 g / L of CaCl, 0.329 g / L of KCl, and 0.092 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 4830.6mg / L, Mg 2+ 241.7mg / L, Ca 2+ was 361.0 mg / L, and K + was 192.6 mg / L.

[0050] In Comparative Example 10, 15.008 g / L of NaCl, 1.307 g / L of MgCl, 1.846 g / L of MgSO, 0.549 g / L of CaCl, 0.215 g / L of KCl, and 0.096 g / L of NaHCO were added to the solvent. At this time, the ion concentration of the crustacean breeding water 10 was + 5106.1mg / L, Mg 2+ 444.7mg / L, Ca 2+ was 627.9 mg / L, and K + was 186.6 mg / L.

[0051] Regarding the survival rate of crustaceans, the survival rate of mitten crab zoea larvae was evaluated 30 days after the start of rearing. The survival rate of mitten crab zoea larvae was calculated as a percentage (%) by dividing the total number of individuals 30 days after the start of rearing by the total number of individuals on the start of rearing (immediately after hatching). The total number of zoea larvae was measured using the following procedure. First, a 7m 3 1 L of water was quickly collected from three different locations in the rearing tank using a water sampling device such as a beaker. Next, all zoea larvae contained in each collected rearing water sample (1 L) were visually counted, and the average of the three counts was calculated as the average number of zoea larvae per L (individuals / L). Finally, this average number was multiplied by the total water volume of the rearing tank (7000 L) to calculate the estimated total number of individuals in the rearing tank, which was used as the total number of zoea larvae. The survival rate was evaluated as follows: over 60% was rated "Good" and less than 60% was rated "Poor."

[0052] <Experimental results on survival rates of crustaceans> The results of this experiment are shown in Table 1.

[0053] [Table 1]

[0054] According to Table 1, the survival rates of the crustaceans in each example that were given an "Evaluation: ○" were, in descending order of survival rate, 72% for Inventive Example 1, 70% for Inventive Example 2, 66% for Inventive Example 3, and 65% for Inventive Example 4. Inventive Examples 1 to 4 had survival rates of over 60%, so they were given an "Evaluation: ○" rating.

[0055] The crustacean breeding water 10 of Examples 1 to 4 of the present invention contains, as solute masses per 1 L of the breeding water, 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3. The crustacean breeding water 10 of Examples 1 to 4 of the present invention contains, as solute masses per 1 L of the breeding water, 3896.9 to 5268.7 mg of Na + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K. + As a result, the survival rate of crustaceans was increased to 60% or more, which ensures a significant improvement in the production efficiency of crustaceans compared to when natural seawater is used.

[0056] Furthermore, the survival rates of the crustaceans in each example with a "Rating: △" were, in order of highest survival rate, 58% for Comparative Example 1, 56% for Comparative Example 2, 55% for Comparative Example 3, 55% for Comparative Example 4, 54% for Comparative Example 5, 53% for Comparative Example 6, 52% for Comparative Example 7, 47% for Comparative Example 8, 45% for Comparative Example 9, and 43% for Comparative Example 10.

[0057] In Comparative Example 1, the NaHCO3 was less than 0.085 g / L. 2+ is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0058] In Comparative Example 2, NaHCO3 was more than 0.118 g / L. 2+is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0059] In Comparative Example 3, MgCl2 was more than 1.384 g / L and MgSO4 was more than 1.943 g / L. 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0060] In Comparative Example 4, the CaCl2 was more than 0.659 g / L. 2+ is less than 515.7 mg / L, Ca 2+ is over 306.4 mg / L, K + As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0061] In Comparative Example 5, the KCl content was more than 0.429 g / L. 2+ is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0062] In Comparative Example 6, the NaCl content was more than 15.486 g / L. + is over 5268.7 mg / L, Mg 2+ is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0063] In Comparative Example 7, the NaCl content was less than 11.454 g / L. + is less than 3896.9 mg / L, Mg 2+ is less than 515.7 mg / L, Ca 2+As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0064] In Comparative Example 8, the CaCl2 was less than 0.451 g / L. 2+ is less than 515.7 mg / L, Ca 2+ is over 306.4 mg / L, K + As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0065] In Comparative Example 9, MgCl2 was less than 0.969 g / L and MgSO4 was less than 1.392 g / L. 2+ is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0066] In Comparative Example 10, the KCl content was less than 0.309 g / L. 2+ is less than 515.7 mg / L, Ca 2+ As a result, the survival rate of crustaceans is less than 60%, which may prevent a reliable improvement in the production efficiency of crustaceans.

[0067] Specifically, the crustacean rearing water 10 suitable for improving the survival rate of crustaceans contains, as solute masses per liter of rearing water, 11.454 to 15.486 g of NaCl, 0.969 to 1.384 g of MgCl2, 1.392 to 1.943 g of MgSO4, 0.451 to 0.659 g of CaCl2, 0.309 to 0.429 g of KCl, and 0.085 to 0.118 g of NaHCO3. Also, as solute masses per liter of rearing water, 3896.9 to 5268.7 mg of Na + and 515.7 to 731.4 mg of Mg 2+ and 209.7–306.4 mg of Ca. 2+ and 150.4 to 208.8 mg of K.+ and,

[0068] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0069] 100 Aquaculture Systems 1. Storage section 10. Crustacean breeding water 2. Physical filtration equipment 3. Biological filtration system 4 Sterilizer P Water pump

Claims

1. A crustacean breeding water used for breeding crustaceans, The mass of solute per 1 L of breeding water is: 11.454 to 15.486 g of NaCl; 0.969 to 1.384 g of MgCl 2 and, 1.392 to 1.943 g of MgSO 4 and, 0.451 to 0.659 g of CaCl 2 and, 0.309 to 0.429 g of KCl; 0.085 to 0.118 g of NaHCO 3 and, Including The breeding water for crustaceans is characterized by the following.

2. A crustacean breeding water used for breeding crustaceans, The mass of solute per 1 L of breeding water is: 3896.9-5268.7 mg of Na + and, 515.7-731.4 mg Mg 2+ and, 209.7 to 306.4 mg of Ca 2+ and, 150.4-208.8 mg of K + and, Including The breeding water for crustaceans is characterized by the following.

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