JP6675238B2 - Aquatic aquaculture materials - Google Patents

Description

  The present invention relates to a material for aquaculture of aquatic organisms.

With the growing population of the world and concerns about the supply of agricultural products due to climate change and other factors, the environment for securing food is becoming increasingly severe. Under such circumstances, the demand for marine products is increasing worldwide.
However, global fisheries production has been around 90 million tons in the last 20 years and has leveled off. In particular, it is said that the amount that can be caught in the ocean has already reached its limit. Under such circumstances, there is a great expectation for aquaculture of marine products as an important means of securing marine products.
Among marine aquacultures, shrimp cultivation has become increasingly important as a means of stably securing animal protein as food, with high feed efficiency (the efficiency of increasing body weight per unit mass of feed consumed). I have.

In Southeast Asia, intensive aquaculture techniques have been developed in which juvenile shrimp are released into large cultivation ponds that have been created, a large amount of compound feed is administered, and breeding is performed at high density.
However, there is a problem of deterioration of the aquaculture environment (for example, deterioration of water quality, generation of flagella algae and the like) due to residual food and excrement, and influence of polluted drainage on the surrounding environment. In addition, there is a problem that shrimp growth is poor due to deterioration of the aquaculture environment, and that the survival rate of shrimp is reduced due to the occurrence and spread of disease.
As a technique for improving the aquaculture environment, Patent Literature 1 describes a feed for aquaculture fish mainly containing porous calcium silicate having a solubilization rate of 50% or more. According to the feed, silicate ions eluted from the porous calcium silicate contained in the feed serve as diatom feed, and promote the growth of diatoms. It is described that the generation is suppressed, and an effect of maintaining good water quality is expected.

JP-A-6-54652

According to the feed for cultured fish of Patent Literature 1, it is expected that the survival rate of aquatic organisms to be cultured is improved by promoting the growth of diatoms and improving the growth environment.
In aquaculture in closed water areas such as aquaculture ponds and aquaculture tanks, it is possible to suppress the deterioration of water quality without the necessity of huge water purification facilities and water purification ponds, etc., and to survive aquatic organisms to be cultured. It would be advantageous to have an aquatic aquaculture material that could increase the rate and promote the growth of aquatic organisms.
An object of the present invention is to control water quality, even in a large-scale aquaculture pond where it is difficult to maintain a growing environment, and to suppress deterioration of water quality and improve the growing environment, thereby improving the survival rate of aquatic organisms to be cultured. It is an object of the present invention to provide an aquatic organism culture material that can be improved and promote the growth of aquatic organisms.

The present inventors have conducted intensive studies in order to solve the above-described problems, and as a result, have combined a calcium silicate-containing material, and a nutritional supplement composed of one or both of a carbon-containing nutrient and a nitrogen-containing nutrient. It has been found that the above object can be achieved by using the aquatic organism culture material, and the present invention has been completed.
That is, the present invention provides the following [1] to [9].
[1] A material for culturing aquatic organisms, comprising a combination of a calcium silicate-containing material and a nutritional supplement comprising one or both of a carbon-containing nutrient and a nitrogen-containing nutrient.
[2] The aquatic organism culture material is (a) a powdery and granular form containing the calcium silicate-containing material and the nutritional supplementary material, and (b) a slurry containing the calcium silicate-containing material and the nutritional supplementary material. And (c) a combination of a powder-granule or slurry containing the calcium silicate-containing material and a powder-granular, slurry- or liquid-form containing the nutritional supplement. The material for aquatic organism culture according to the above [1].
[3] The carbon-containing nutrient is at least one selected from the group consisting of monosaccharides, oligosaccharides, and polysaccharides, and the nitrogen-containing nutrient is urea, thiourea, uric acid, urate, The aquatic organism culture material according to the above [1] or [2], which is at least one selected from the group consisting of amino acids, oligopeptides, and proteins.
[4] The above-mentioned calcium silicate-containing material is a granular material containing at least one selected from the group consisting of tobermorite, zonotolite, CSH gel, fosharite, gyrolite, hillebrandite, and wollastonite. The material for culturing aquatic organisms according to any one of [1] to [3].

[5] A method for culturing aquatic organisms using the aquatic organism culture material according to any one of [1] to [4], wherein the aquaculture water for containing the aquatic organisms is: A method for culturing aquatic organisms, comprising supplying the aquatic organism culture material and culturing the aquatic organisms.
[6] The method for culturing aquatic organisms according to the above [5], wherein the calcium silicate-containing material is repeatedly supplied at intervals.
[7] The method for culturing aquatic organisms according to [5] or [6], wherein the nutraceutical material is supplied at one or more times before an end point of a period for supplying the calcium silicate-containing material.
[8] The aquatic organism according to any one of [5] to [7], wherein the calcium silicate-containing material and the nutritional supplement are simultaneously supplied, and then the calcium silicate-containing material alone is further supplied at least once. Culture method.
[9] The method for culturing aquatic organisms according to any of [5] to [8], wherein the aquatic organisms are crustaceans.

  According to the aquatic aquaculture material of the present invention, water quality management, even in a large aquaculture pond where it is difficult to maintain the growth environment, can suppress the deterioration of water quality and improve the survival rate of aquatic organisms to be aquacultured. In addition, the growth of aquatic organisms can be promoted.

The aquatic organism culture material of the present invention is a combination of a calcium silicate-containing material and a nutritional supplement consisting of one or both of a carbon-containing nutrient and a nitrogen-containing nutrient.
The calcium silicate-containing material contains at least one selected from the group consisting of tobermorite, zonotolite, CSH gel, fosharite, gyrolite, hillebrandite, wollastonite, and the like.
Tobermorite refers to Ca _5. (Si ₆ O ₁₈ H ₂ ) .4H ₂ O (plate form), Ca _5. (Si ₆ O ₁₈ H ₂ ) (plate form), Ca _5. (Si ₆ O ₁₈ H ₂ ) .8H ₂ O (fibrous form).
Zonotorite has a chemical composition such as Ca _6. (Si ₆ O ₁₇ ). (OH) ₂ (fibrous form).
The CSH gel, those having a chemical composition of _{αCaO · βSiO 2 · γH 2 O} ( provided that, alpha / beta = 0.7 to 2.3, a γ / β = 1.2~2.7.) is there. Specific examples include calcium silicate hydrate having a chemical composition of 3CaO · 2SiO ₂ · 3H ₂ O.
Foshagite has a chemical composition such as Ca ₄ (SiO ₃ ) ₃ (OH) ₂ .
The gyro _light, those having a _{(NaCa 2) Ca 14 (Si} 23 Al) O 60 (OH) 8 · 14H 2 O The chemical composition of such.
Hillebrandite has a chemical composition such as Ca ₂ SiO ₃ (OH) ₂ .
Wollastonite has a chemical composition such as CaO.SiO ₂ (fibrous or columnar form).

  Among them, tobermorite is preferred from the viewpoint of availability and economy. Although natural minerals may be used as tobermorite, it is preferable to use lightweight cellular concrete (ALC) containing tobermorite as a main component from the viewpoint of availability. In addition, from the viewpoint of promoting the use of waste materials, it is more preferable to use lightweight cellular concrete scraps generated in the production process of lightweight cellular concrete and construction sites.

The lightweight cellular concrete is composed of tobermorite and unreacted silica stone, and has a porosity of about 80% by volume. Here, the porosity means the ratio of the total volume of the voids in the total volume of the concrete.
The proportion of tobermorite in the lightweight cellular concrete is about 65 to 80% by volume, assuming that the entire solid phase excluding voids inside the lightweight cellular concrete is 100% by volume.
The lightweight cellular concrete can be obtained, for example, by autoclaving a raw material (for example, a hardened body composed of a mixture thereof) containing silica stone powder, cement, quicklime powder, a foaming agent (for example, aluminum powder), water and the like. .

  Further, the calcium silicate-containing material is preferably porous. When the calcium silicate-containing material is porous, when the material is added to water, the air present in the porous portion of the material is entrained in the water, thereby reducing the amount of dissolved oxygen in the water. Can be prevented.

The calcium silicate-containing material used in the present invention is preferably a granular material (powder or granular material). The particle size of the calcium silicate-containing material is preferably 6 mm or less, more preferably 5 mm or less, particularly preferably 4.5 mm or less, from the viewpoint of increasing the amount of water-soluble SiO ₂ contained in the material. The lower limit of the particle size is preferably 0.001 mm, more preferably 0.005 mm, and particularly preferably 0.01 mm, from the viewpoint of reducing the energy required for pulverization.
When the amount of water-soluble SiO ₂ eluted increases, the growth of diatoms becomes more stable, and the growth of diatoms is further promoted.
The particle size distribution of the calcium silicate-containing material preferably includes particles having a particle size of 6 mm or less in a proportion of 70% by mass or more, and more preferably 5 mm, from the viewpoint of increasing the amount of water-soluble SiO ₂ eluted. Particles having the following particle size are contained in a proportion of 70% by mass or more, and particularly preferably particles having a particle size of 4.5 mm or less are contained in a ratio of 70% by mass or more.
In the present specification, the value of the particle size is a value corresponding to the opening size of the sieve.

  In the aquatic organism culture material of the present invention, the supply amount of the calcium silicate-containing material to the culture water per serving varies depending on the amount of calcium silicate contained in the calcium silicate-containing material. 〜1,000 mg / liter, more preferably 2-500 mg / liter, particularly preferably 3-100 mg / liter. When the amount is 1 mg / liter or more, the growth of diatoms in water is more stable, and the growth thereof is further promoted. When the amount is 1,000 mg / liter or less, a decrease in water quality due to excessive supply of the calcium silicate-containing material can be prevented.

Since the aquatic organism culture material of the present invention is formed by combining a calcium silicate-containing material, the growth of diatoms in water can be stabilized and promoted. As a result, it is possible to suppress the occurrence of water moss and the like in the culture pond and the like, and it is possible to suppress the deterioration of the water quality of the culture water.
Since diatoms have high nutritional value, they can promote the growth of aquatic organisms (for example, crustaceans such as shrimp) that feed on diatoms. In addition, by appropriately turbid water, stress on aquatic organisms can be reduced, and the survival rate of aquatic organisms can be improved.
Further, when the aquatic organism is a crustacean such as shrimp, the formation of the crustacean exoskeleton and the like is promoted, the growth of the crustacean is promoted, and the survival rate can be improved.
Further, an alkaline substance is released into water from the calcium silicate-containing material, so that acidification of water can be prevented.

Examples of the carbon-containing nutrient include one or more selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, and the like.
Monosaccharides include, for example, glucose and the like. Oligosaccharides include, for example, sucrose. Examples of the polysaccharide include cellulose, starch, and the like.
Here, in the present specification, "oligosaccharide" refers to a polymer obtained by polymerizing 2 to 20 monosaccharide molecules. Further, “polysaccharide” refers to a polymer obtained by polymerizing more than 20 monosaccharide molecules.

Examples of the nitrogen-containing nutrient include one or more selected from the group consisting of urea, thiourea, uric acid, urate such as potassium urate, amino acids, oligopeptides, proteins, and the like.
Examples of the material containing both the carbon-containing nutrient and the nitrogen-containing nutrient include flour, rice bran, and peptone.

  In the aquatic organism culture material of the present invention, the supply amount of the carbon-containing nutrient component and the nitrogen-containing nutrient component to the water for aquaculture at one time is preferably a mass ratio of carbon to nitrogen in water (C / N), preferably. The amount is 5 to 50, more preferably 10 to 40, particularly preferably 15 to 25. When the ratio is 5 or more, harmful ammonia, nitrous acid, and nitric acid derived from feeding and excretion of aquatic organisms can be reduced. In addition, it promotes feeding and decomposition of excrement of aquatic organisms, improves sediment quality of aquaculture ponds and the like, and allows microorganisms in water to grow more. When the ratio is 50 or less, deterioration of water quality due to excessive supply of the carbon-containing nutrient can be prevented.

The aquatic organism-cultivating material of the present invention, as a nutritional supplement, is a combination of one or both of a carbon-containing nutrient and a nitrogen-containing nutrient. Microbial clumps called water can form in the water. Microorganisms that constitute bio-locks form proteins using nitrogen in water as a nutrient, and thus formed bioflocs are used as food for aquatic organisms.
The nutritional supplement may be appropriately adjusted depending on the growth status and water quality of the diatom.
For example, when the amount of carbon in the water for aquaculture is small, a calcium silicate-containing material and a carbon-containing nutrient as a nutritional supplement may be combined.

  The aquatic organism culture material of the present invention comprises (a) a powdery and granular form containing a calcium silicate-containing material and a nutritional supplement, (b) a slurry form containing the calcium silicate-containing material and a nutritional supplement, and (C) It has a form selected from a combination of a granular form or a slurry form containing a calcium silicate-containing material and a form of a granular form, a slurry form or a liquid form containing a nutritional supplement.

  The aquatic organism culture material in the form of a powder containing the calcium silicate-containing material and the nutritional supplement is supplied with the calcium silicate-containing material and the nutritional supplement when the material is supplied into the aquaculture water. Since it is preferable that the water is not separated in the culture pond, it is preferable that the water be introduced into the aquaculture ponds or the like before the water is poured into the culture pond or when the water depth is still shallow after the water is started to be poured into the culture pond.

  In addition, from the viewpoint of allowing the aquatic organism culture material of the present invention to settle and settle on the bottom of the water without being separated in water, a granular material containing a calcium silicate-containing material and a nutritional supplementary material, or a granular silica material may be used. A calcium acid-containing material or a nutritional supplement material (hereinafter, also referred to as a “powder and granular material”) may be used after granulation or press molding.

As a method of granulating the granular material, for example, there is a method of granulating the granular material while sprinkling water using a granulator such as a pan pelletizer. In this method, the particle size of the obtained granulated material can be adjusted by repeating the addition of the granular material and watering.
Alternatively, the powdery material and water may be mixed to form a paste, and then the paste-like mixture may be granulated and then dried.
It is preferable that the granulated product obtained by the above method and the press-formed product obtained by press-forming settle in water. Therefore, the specific gravity of the granulated product or the press-formed product is preferably 1 g / cm ³ or more, more preferably 1.2 g / cm ³ or more.

A slurry-like material containing a calcium silicate-containing material and a nutritional supplement material, and a calcium silicate-containing material or a nutritional supplement material in a slurry form (hereinafter, also referred to as a “slurry material”) are powder-granular materials. And water can be obtained by mixing them.
The viscosity of the slurry material is preferably adjusted from the viewpoint of preventing separation in water. The viscosity can be adjusted by, for example, adjusting the addition amount of a carbon-containing nutrient such as starch. The viscosity of the slurry-like material is preferably 5 Pa · s or more from the viewpoint of allowing the solids contained in the slurry-like material to settle to the bottom of the water without separation in water. If the viscosity is too high, the supply cannot be performed using a device such as a pump. Therefore, it is preferable to set an upper limit of the viscosity according to the performance of the device such as a pump.
According to the slurry-like material, a material for aquatic organism culture can be supplied to a culture pond or the like using a pump or the like.

When the nutritional supplement is in a liquid form, the liquid nutritional supplement may be mixed with the calcium silicate-containing material and other nutritional supplements and then into a powdery or slurry form.
In this case, by adjusting the concentration, temperature, and the like of the liquid nutritional supplement, the resulting mixture can be made into a solid, powder, granule, paste, or slurry. The obtained mixture can be cooled, dried, pulverized, or the like, if necessary, to obtain a powdery or slurry form.

As a method of cultivating aquatic organisms using the aquatic organism culture material of the present invention, for example, aquatic organism culture material is supplied into aquaculture water for accommodating aquatic organisms, and the aquatic organism is cultured. Method.
Here, the water for aquaculture is not particularly limited, and may be any of freshwater, brackish water, and seawater.
Aquatic organisms to be cultivated include crustaceans, fish, and shellfish that can be cultivated in the above freshwater and the like.
According to the method for cultivating aquatic organisms of the present invention, the growth of diatoms in water is stabilized, and the growth is promoted. Therefore, the environment is favorable for shellfish such as shrimps that feed on diatoms. In addition, silicon, calcium and magnesium, which are abundantly contained in diatoms, promote the formation of crustacean exoskeleton and the like, thereby promoting the growth of crustaceans and improving the survival rate. Therefore, from these viewpoints, crustaceans such as shrimp are preferred.

The timing of supplying the aquatic organism culture material is not particularly limited, and may be before or after the aquatic organism is put into the aquaculture water, or at the same time.
Above all, from the viewpoint of sufficiently growing diatoms in the water for aquaculture and stabilizing the microflora in the water, before aquatic organisms are put into the water for aquaculture, materials for aquaculture are cultured. Preferably it is supplied.
When supplying aquatic organism culture materials before putting aquatic organisms into the aquaculture water, aquatic organism culture materials should be used in order to increase the diatoms and stabilize the microflora in the water. Is preferably left for at least one day, more preferably for 3 to 60 days, particularly preferably for 5 to 30 days.
In addition, from the viewpoint of further growing the diatom and stabilizing the microflora in the water, it is preferable to perform the standing while aerating.
The order of supplying the calcium silicate-containing material and the nutritional supplement is not particularly limited, but it is preferable to simultaneously supply the calcium silicate-containing material and the nutritional supplement from the viewpoint of reducing labor.

Also, from the viewpoint of further growing diatoms and stabilizing the microflora in the water, after supplying the aquatic organism culture material, the calcium silicate-containing material is repeatedly supplied at time intervals. Is also good. The interval for repeatedly supplying the calcium silicate-containing material is preferably 1 to 30 days, more preferably 2 to 15 days, and particularly preferably 3 to 10 days. If the interval is one day or more, labor can be reduced. When the interval is 15 days or less, the growth of diatoms in water is more stable, and the growth thereof is further promoted.
In addition, from the viewpoint of sufficiently growing aquatic organisms, the period for supplying the calcium silicate-containing material is preferably 15 days or more, more preferably 20 days or more, and particularly preferably 30 days or more.

  When the calcium silicate-containing material is further supplied after supplying the aquatic organism culture material, the supply amount per serving varies depending on the amount of calcium silicate contained in the calcium silicate-containing material. 200 to 100 mg / liter, more preferably 20 to 100 mg / liter, and particularly preferably 40 to 80 mg / liter. When the amount is 1 mg / liter or more, the growth of diatoms in water is more stable, and the growth thereof is further promoted. When the amount is 200 mg / liter or less, an excessive supply of calcium silicate can be prevented.

The nutraceutical material may be provided in the aquaculture water at the same time as the calcium silicate-containing material, or at another time, separately from the supply of the calcium silicate-containing material.
Further, at one or more time points before the end point of the period for supplying the calcium silicate-containing material depending on the growth status and water quality of the diatom, the nutritional supplement may be additionally supplied as appropriate.

Materials used are as shown below.
(1) Calcium silicate-containing material: Light aerated concrete is crushed and pulverized into granular powder (hereinafter also referred to as "ALC powder particulate"), particle size: 0.02 to 4 mm
(2) Nitrogen-containing nutrient: Urea (3) Carbon-containing nutrient A: sucrose (4) Carbon-containing nutrient B: Starch (5) Artificial seawater: 12.5 kg, manufactured by Marine Tech Co., Ltd. Was added to 500 liters of distilled water

[Example 1]
ALC powder (100 parts by mass), 1,200 parts by mass of sucrose and 50 parts by mass of urea were mixed such that the mass ratio (C / N) of carbon and nitrogen in the water of the aquaculture tank was 22. The obtained mixture was put into a cylindrical mold having a diameter of 10 mm, and then press-molded to produce a pellet-like aquaculture material having a diameter of 10 mm and a height of 20 mm.
After 250 g of aquatic organism culture material was put into a culture tank containing 500 liters of artificial seawater, it was allowed to stand for one week while constantly aerated. One week later, the water (water before pouring shrimp) was brown, indicating that diatoms were growing.
One week later, the ALC powder / granule was added to the aquarium in an amount of 60 mg / l, and 60 banana shrimp were placed. From the 0th day of breeding, the ALC powder / granulate was 60 mg / l every 7 days. Were fed for 60 days. The average weight of the lobster at the start of rearing was 1.55 g.
The average weight, the average weight gain ratio after 60 days, and the survival rate were calculated from the surviving number and the body weight of the red shrimp after 60 days. Table 1 shows the results.
The average weight gain ratio after 60 days is the mass ratio of the average body weight after 60 days to the average body weight at the start (average body weight after 60 days / average body weight at the start).

[Example 2]
ALC powder (100 parts by mass), 1,200 parts by mass of sucrose and 50 parts by mass of urea were mixed such that the mass ratio (C / N) of carbon and nitrogen in the water of the aquaculture tank was 22. The obtained mixture was put into a pan pelletizer, and granulated while spraying water. The granulation was performed until the particle diameter became 10 to 15 mm while repeatedly adding and sprinkling the mixture, and then, natural drying was performed to produce a granular aquatic organism culture material.
Banana shrimp were bred for 60 days in the same manner as in Example 1 except that a granular aquatic organism culture material was used instead of the pelletized aquatic organism culture material.
In the same manner as in Example 1, the average body weight, the average weight increase ratio after 60 days, and the survival rate were calculated.
In addition, the water after standing still for one week (water before pouring shrimp) was brown, indicating that diatoms were growing.

[Example 3]
100 parts by mass of ALC powder and granular material, 1,000 parts by mass of starch and 50 parts by mass of urea were mixed so that the mass ratio (C / N) of carbon and nitrogen in water in the aquarium was 20. 30 parts by weight of water was added to 100 parts by weight of the obtained mixture, and then kneaded to prepare a paste. The obtained paste was rolled by hand to obtain a granular material having a particle size of 10 to 15 mm, and then air-dried to prepare a granular aquaculture material.
Banana shrimp were bred for 60 days in the same manner as in Example 1 except that a granular aquatic organism culture material was used instead of the pelletized aquatic organism culture material.
In the same manner as in Example 1, the average body weight, the average weight increase ratio after 60 days, and the survival rate were calculated.
In addition, the water after standing still for one week (water before pouring shrimp) was brown, indicating that diatoms were growing.

[Example 4]
100 parts by mass of ALC powder and granular material, 1,000 parts by mass of starch and 50 parts by mass of urea were mixed so that the mass ratio (C / N) of carbon and nitrogen in water in the aquarium was 20. After 50 parts by weight of water was added to 100 parts by weight of the obtained mixture, the mixture was kneaded to prepare a slurry-like aquatic organism culture material.
The aquaculture material in the form of slurry was injected into a culture tank containing 500 liters of artificial seawater in an amount of 250 g in terms of solid content by a pump, and then left standing for one week while constantly aerated. One week later, the water (water before pouring shrimp) was brown, indicating that diatoms were growing.
One week later, the ALC powder / granule was added to the aquarium in an amount of 60 mg / l, and 60 banana shrimp were placed. From the 0th day of breeding, the ALC powder / granulate was 60 mg / l every 7 days. Were fed for 60 days.
The average weight, the average weight gain ratio after 60 days, and the survival rate were calculated from the surviving number and the body weight of the red shrimp after 60 days. Table 1 shows the results.

[Comparative Example 1]
An aquaculture tank containing 500 liters of artificial seawater was allowed to stand for one week while constantly aerated. One week later, the water was green, indicating that green algae including dinoflagellate and the like were growing. One week later, a red lobster having an average body weight of 1.47 g was added, and reared for 60 days.
In the same manner as in Example 1, the average body weight, the average weight increase ratio after 60 days, and the survival rate were calculated.
Table 1 shows the above results.

From Table 1, according to the aquatic organism culture material of the present invention (Examples 1 to 4), the average weight gain ratio after 60 days is 5.0 to 5.2, and the average weight of Comparative Example 1 after 60 days. It can be seen that it is larger than the increase ratio (4.7).
In addition, the survival rates of Examples 1 to 4 are 80 to 84%, which is larger than the survival rate (75%) of Comparative Example 1 in which the aquatic organism culture material is not added.

Claims (8)

Calcium silicate-containing material, and a method of culturing aquatic organisms using an aquatic organism culturing material obtained by combining a nutritional supplement consisting of both a carbon-containing nutrient and a nitrogen-containing nutrient ,
The calcium silicate-containing material is a granular material of lightweight cellular concrete, and the carbon-containing nutrient is one or more selected from the group consisting of monosaccharides, oligosaccharides, and polysaccharides, and the nitrogen Nutrient content is one or more selected from the group consisting of urea, thiourea, uric acid, urate, amino acids, oligopeptides, and proteins,
After supplying a part of the calcium silicate-containing material and the whole of the nutritional supplement material into the water for aquaculture, the remaining calcium silicate-containing material is repeatedly supplied at time intervals. By culturing the aquatic organisms in the aquaculture water,
A method for culturing aquatic organisms, wherein the supply amounts of the carbon-containing nutrient and the nitrogen-containing nutrient are such that the mass ratio (C / N) of carbon to nitrogen in the water is 15 to 25. The method for culturing aquatic organisms according to claim 1, wherein the time interval is 2 to 15 days. The method for cultivating aquatic organisms according to claim 1 or 2, wherein the supply amount per time of the calcium silicate-containing material supplied repeatedly at intervals of time is 20 to 100 mg / liter. The method for cultivating aquatic organisms according to any one of claims 1 to 3, wherein a particle size distribution of the calcium silicate-containing material includes particles having a particle size of 6 mm or less at a ratio of 70% by mass or more. The method for culturing aquatic organisms according to any one of claims 1 to 4 , wherein a part of the calcium silicate-containing material and the entirety of the nutritional supplement are simultaneously supplied . The co-feeding is performed by mixing a part of the calcium silicate-containing material and all of the nutraceutical material, and then using the obtained mixture to obtain aquatic organisms in the form of pellets, granules, or slurries. The method for cultivating aquatic organisms according to claim 5, wherein the method is performed in the above-mentioned form after producing a culture material. A part of the calcium silicate-containing material and the whole of the nutraceutical material are supplied into the water for aquaculture and allowed to stand for 1 to 30 days. The method for cultivating aquatic organisms according to any one of claims 1 to 6, wherein the cultivation is carried out by placing the cultivation in a water. The method for cultivating an aquatic organism according to any one of claims 1 to 7 , wherein the aquatic organism is a crustacean.