JP2813974B2 - Aquatic product propagation medium and marine ranch using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aquatic product propagation medium for creating an aquatic environment in which aquatic products such as fishing reefs and algae reefs can live, and for protecting and growing the aquatic products, and a marine ranch using the same. .

[0002]

2. Description of the Related Art The coast, which is supposed to be abundant in aquatic products such as fish, seaweed, shellfish, shrimp, and crab, is reclaimed along with the development of the industrial economy, and a number of coastal industrial zones are constructed. Large-scale marine transportation has been carried out, and the development and expansion of large-scale port facilities have been progressing rapidly.
Many man-made structures were constructed in the name of protecting people from disasters such as coastal erosion and waves, and many large-scale recreational facilities were built according to the marine leisure orientation of the people. As a result, these water products are drastically reduced due to the deterioration of water quality, sediment mixing or overfishing, and the so-called shore burning phenomenon (so-called seaweeds, seaweeds, kelp, and many other seaweeds that form seaweed beds die and become barren As a result, a large amount of pink hard seaweed, in which calcium carbonate was deposited on algal bodies called corals (lime algae), covering the sea floor, has become common.

[0003] On the other hand, the fishery nation Japan, which has flourished into the world's oceans, has also shifted from a globally harsh fishery environment, which has become increasingly severe every year, to a fishery that returns to the coast and manages marine resources, breeds, raises and harvests. Have to be forced. Therefore, large-scale fishing grounds are now being built around the coast.

Under these circumstances, the construction of fishing grounds that have been carried out so far involves the dumping of natural stones, blasting of reefs, and the casting of concrete moldings. is there. This concrete molded product is easily used in molding, and can be mass-produced in a constant shape, and is excellent in durability and strength. However, it has been found that a concrete molded product has a high production cost, and in two to three years after being put into the sea, the effect of forming seaweed is remarkably reduced, and is inferior to natural stone.

[0005] Therefore, although it is a concrete molded product, it may be close to the shape of a natural stone, another material such as ferrous sulfate applied, or a plastic pipe or mat adhered to the concrete molded product. Are known.

[0006]

[Problems to be Solved by the Invention] However, in the above-mentioned method, although the effect of forming seaweeds is somewhat improved, the cost of high-concrete concrete moldings increases, and natural stones are cut and dropped from the mountain. Will be better. In addition, there are effects such as the establishment of seaweeds and the inhabitation of many benthic animals such as shellfish and shrimp.However, it is more costly than the ones, and there is concern about detachment of plastic pipes and mats. Is about to be done. Furthermore, these improved concrete moldings cannot cope with any contamination of the water quality and bottom sediment in the coastal waters where fishing grounds are to be created, and are completely powerless. In such a case, other methods, for example, a method of spraying slaked lime and quick lime onto the contaminated sea area, are used together, and the response is complicated.

Therefore, the present invention has been made in view of the above circumstances, and is easy to manufacture and low in cost. Further, it is possible to protect and grow marine products well while improving and maintaining the surrounding water quality and bottom quality. It is an object to provide a marine product propagation medium and a marine pasture using the same.

[0008]

The present inventor has been investigating and studying the composition and properties of shell fossils for many years. He has also continued his research on fish cultivation and the maintenance and management of water quality and bottom sediment in fish farms. As a result, it makes the most sense to use the natural seawater's inherent capacity to retain the aquatic products, and drawing out its unimaginable capacity will contribute to the development of coastal fisheries in the future. It also restores the polluted coastal water quality and bottom sediment, thereby improving the water quality and sediment, breeding seaweed, and using the abundant seaweed to inhabit marine animals, such as nursing infants. I came to think that it was better to give a place. The present inventors have found that activated heat-treated shell fossils improve the water quality and sediment quality, and have found that fishing reefs and algal reefs containing heat-treated shell fossils have a high ability to grow seaweed and have reached the present invention. It was done.

Therefore, in order to achieve the above object, a first aspect of the present invention is provided.
The invention discloses that shell fossils formed of humus-soluble crystals formed by burying and depositing various nekton, plankton, algae, seaweeds and the like made of calcareous materials, silicic acid, etc., at 170 ° C. to 270 ° C.
The heat-treated shell fossil obtained by heat treatment to remove and activate water of crystallization in the range described above is mixed with at least an aggregate and a solidifying agent at a predetermined ratio and solidified into an arbitrary shape, and the solidified product is put into water. It is characterized as a breeding ground for marine products. Thus, according to the aquatic product growth medium having this feature,
Due to the heat-treated shell fossils in the solidified material, sulfide, COD, ammonia nitrogen,
Since it rapidly attenuates nitrite nitrogen and phosphate phosphorus, does not affect the dissolved oxygen that is a positive factor, and hardly raises the pH, it creates a favorable environment for marine products and minerals contained in shell fossils Depending on the directivity of the marine plant that seeks to utilize the fraction, the marine plant will settle well on the solidified material.

[0010] The invention of claim 2 is characterized in that the heat-treated shellfish of claim 1 is adhered to a core body of an arbitrary shape. Therefore, according to this feature, it is possible to change the existing core together with the characteristics of the existing core to the one having the above-mentioned effect, and to additionally heat-treat the shell fossil rather than manufacturing the whole including the core. Use can be reduced.

The invention according to claim 3 is characterized in that the solidified material is provided with irregularities. Therefore, according to this feature, the marine plants are even better settled on the solidified product.

The invention according to claim 4 is characterized in that the solidified material is provided with a depression and / or a passage hole. Therefore,
According to this feature, the marine animals tend to gather in the solidified matter.

[0013] The invention according to claim 5 is the invention according to claims 1 and 2,
A seaweed bed is constructed by charging and placing the aquatic product growth medium described in 3 or 4 above. Therefore, according to the marine ranch of this feature, the characteristics of each aquatic product growth medium provide a favorable environment for aquatic products and the aquatic plants settle well on the solidified material. By analogy, good livestock can grow and good marine plants can be used effectively, as well as good livestock where good grass grows.

According to a sixth aspect of the present invention, a fixed section of the sea floor is surrounded by a large-sized concrete block, and the marine product propagation medium according to the first, second, third or fourth aspect is charged and arranged in the enclosure to form a seaweed bed. It is characterized by becoming. Therefore, according to this feature, in addition to the above-mentioned effects, the aquatic product growth medium does not run off or move in rotation.

According to a seventh aspect of the present invention, a small-sized concrete block is put and placed in an enclosure formed by the large-sized concrete block, and the medium for aquatic product propagation according to any one of claims 1, 2, 3 and 4 is provided on the small-sized concrete block. It is characterized by the fact that it is placed and the seaweed bed is created. Therefore, according to this feature, in addition to the above-described effects, the aquatic product growth medium is not buried or washed away.

The invention of claim 8 is characterized in that the heat-treated shell fossil is adhered to the large-sized concrete block. Therefore, according to this feature, in addition to the above-described effects, it is possible to provide a large concrete block with an effect of exhibiting a favorable environment for aquatic products and of allowing marine plants to adhere to solidified products.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail. As shown in FIG. 1, the aquatic product growth medium 1 of the present invention has a through hole 3 in the middle of a solidified substance 2 having a cubic shape.
However, this shape is not particularly limited, such as a rectangular parallelepiped, a columnar body, a spherical body, and includes a large-sized one used for a breakwater, a pebble-shaped one having a diameter of about 2 to 3 cm, At least an aggregate and a solidifying agent are mixed in a heat treatment shell fossil at a predetermined ratio and solidified into an arbitrary shape, and the solidified product is poured into water to form a breeding ground for aquatic products.

The shell fossils used in the present invention are foraminiferal fossils in the archaeological name and calcareous sandstone in the geological name. To produce. This shell fossil, more specifically,
The following quantitative analysis of the samples mined at the Iwatsubo A, B, and C mines in the Toyama mine in Toyama Prefecture was reported on August 7, 1979, by the Nagoya Trade and Industry Bureau (No. 564 No. 564). Table (Table 1) and the samples mined at the Takaoka mine in Toyama Prefecture
The following quantitative analysis table (Table 2), which was reported by the Nagoya Trade and Industry Bureau on March 20 (52 Tsutsumi Kogyo No. 1071)
And similar products of shell fossils mined from the Toyama mine and the Takaoka mine.

[0019]

[Table 1]

[0020]

[Table 2]

The shell fossils mined in Toyama Prefecture differ greatly in the molecular composition from those of shell fossils mined in other parts of Japan. Is characterized by a very high content of. And this shell fossil has an aragolite-type crystal structure secreted from the living body, has a certain effective diameter, and has a myriad of pores containing water of crystallization, and activation by removing this water of crystallization, , Which has an adsorption performance.

In order to obtain a so-called heat-treated shell fossil obtained by imparting adsorption performance to shell fossils mined from a mine, shell fossils are crushed to 5 mm or less, passed through a 5-mm mesh sieve, and dried with a dryer. Heat treatment is performed at a temperature in the range of 170 ° C. to 270 ° C. to remove water of crystallization, and the mixture is passed through a mesh sieve having a mesh size of 2 mm and cooled to a normal temperature with a cooler to obtain.

The aggregate varies depending on the type of the solidifying agent.
From the standpoint of preventing the aquatic product growth medium 1 from flowing out of the water stream, a medium having a certain weight is desirable. Therefore, crushed gravel, crushed stones and shells are used.

The solidifying agent is typified by cement, and in addition, inorganic materials such as clay, gypsum and water glass, and organic materials such as synthetic resin emulsion and synthetic rubber latex are used.

When the cement is used as the solidifying agent, one example of the compounding ratio of the heat-treated shell fossil, the aggregate and the solidifying agent is as follows. , 748kg /
m ^3, aggregates (coarse aggregates) is 1112kg / ^{m 3,} the solidifying agent is 268 kg / ^{m 3,} water 155 kg / ^{m 3,} admixture is 0.67 kg / ^{m 3.} The actual mixing ratio varies from these values within a range of about ± 20% at the maximum.

The marine product growth medium 1a is shown in FIGS.
As shown in the figure, existing fishing reefs and algae reefs are used as the cores 4 or natural stones, regardless of the type or size of the natural stones, are used as the cores 4 and heat treated shell fossils are attached to the surface of these cores 4 It may be made to be. According to the method, a mixture of a heat-treated shell fossil as a fine bone material and a solidifying agent having a function of solidifying and bonding the mixture is sprayed on the core 4 to form a heat-treated shell fossil layer 5. At this time, the heat-treated shell fossil layer 5 may be formed on the entire surface of the core body 3, or the heat-treated shell fossil layer 5 may be formed on the remaining surface excluding the portion in contact with the water bottom.

Further, as shown in FIG. 4, the aquatic product growth medium 1b is provided with irregularities 6 on the surface of the solidified product 2 so that seaweed, which is a marine plant, is easy to grow, This has the effect of increasing the area in contact with water and sediment. The main purpose of providing the irregularities 6 on this surface is to facilitate the formation of seaweeds. On the contrary, by adjusting the number and amount of the irregularities 6, the surface area of the solidified material 2 is changed, By adjusting the area of fossils in contact with water and sediment, it is possible to control the dissolution of heat-treated fossils.

Further, as shown in FIG. 5, the marine product growth medium 1c is provided with a depression 7 on the surface of the solidified product 2 and further with a passage hole 3 as shown in FIG. 1 to provide shellfish such as turban flies, abalones and fists. It is a place where lobsters, sea lobsters, sea cucumber, octopus octopus and fish can inhabit.

FIG. 6 shows the aquatic product growth medium 1, 1a, 1
The seaweed bed 11 is created by placing each of b and 1c individually or in a mixed manner in a fixed section of the seabed 10 to create a seaweed bed 11, and the section and its surroundings are used as a marine pasture 12. The aquatic product growth media 1, 1a, 1b, and 1c fully exhibit the function as an algae reef, make the seaweed beds 11 rich in seaweeds, and marine animals that feed on seaweeds breed, and the seaweeds can be relocated.
The fish that spawn will be gathered, and the marine animals and large marine animals feeding on the fish will migrate, and the whole area is like raising livestock that grasses on a lush meadow. It becomes a situation, and people call it an ocean ranch.

As shown in FIG. 7, the marine ranch 12a has a large concrete block 13 around the seaweed bed 11.
To prevent the aquatic product growth medium 1, 1 a, 1 b, 1 c that specifically constitutes the seaweed bed 11 from being washed away by ocean currents or waves, or the aquatic product growth medium 1, 1a, 1b and 1c are prevented from moving and rotating. That is, for the large-sized concrete block 13, a concrete block that has been proven to be effective as an existing breakwater, submerged dike, or dike is used. In addition, it is natural that the large-sized concrete block 13 also has a function as a propagation medium of the marine product.

As shown in FIG. 8, the marine ranch 12b has a small concrete block before the marine breeding medium 1, 1a, 1b, 1c is placed on the seabed 10 in the enclosure by the large concrete block 13. The block 14 is introduced so that the aquatic product growth medium 1, 1a, 1b, 1c is not buried or washed away,
This is particularly effective when the seabed 10 is sandy.

The large concrete block 13
The heat-treated shellfish fossil layer 5 is formed to provide a favorable environment for aquatic products, and to give the marine plant a favorable effect of growing on the heat-treated shellfish fossil layer 5. In this way, the function as a marine ranch is further improved and is convenient.

Next, a survey was conducted to confirm the effect of the marine product growth medium having the above-described structure, and the situation will be described. Example 1 An aquatic product propagation medium 15 for investigation was prepared by mixing a heat-treated shell fossil with an aggregate and a solidifying agent in the following mixing ratio, and having a shape as shown in FIG.
It is solidified into a solidified material 17 having an m-shaped circular hole 16 and has a handle 18 for charging and lifting. When the mixing ratio is shown in accordance with the method of indicating the mixing ratio of concrete, the heat-treated shell fossil is used as a fine bone material and 748 kg /
m ³ , coarse aggregate (oyster shell, pearl hull shell crushed to about 1 cm and about 10% added) was 1112 kg / m ³ ,
Solidifying agent 268 kg / ^{m 3,} water 155 kg / ^{m 3,} admixture is 0.67 kg / ^{m 3.} As a control, a block having the same shape as that of FIG. 9 was made of ordinary concrete using sand instead of the heat-treated shellfish. These aquatic product growth media 15 and control blocks are examined as follows. 1. Installed water area Installed at a depth of 10m, 15m and 5m below the ground off Kushimoto Marine Park off Wakayama Prefecture. 2. Installation period Approximately one year from May 1995 (Heisei 7) to May 1996 (Heisei 8) Survey date May 14, 1996 (Heisei 8) 4. Survey items Visual observation and photography of attached organisms at the site. Measurement of total biomass (wet weight) attached to aquatic product growth medium 15 and control block. Assessment of attached marine plant and animal species and their quantitative measurement.

As a result of the visual observation of the attached organisms at the site, when the water depth is 5 m, the aquatic product growth medium 15 has slightly more attached organisms than the control block, and there is no significant difference. At a water depth of 10 m, the aquatic product growth medium 15 clearly had more adherent organisms than the control block, and attachment of the sand barnacle was more common. At a water depth of 15 m, the aquatic product growth medium 15 had overwhelmingly more adherent organisms than the control block.

Aquatic product growth medium 1 at a depth of 15 m
5 and total biomass (wet weight) attached to the control block
Is shown in Table 3.

[0036]

[Table 3]

Table 4 shows the marine plants and Table 5 shows the marine animals for the assessment of the species of attached marine plants and animals at a depth of 15 m and the quantitative measurement thereof.

[0038]

[Table 4]

[0039]

[Table 5]

In addition, the evaluation of the species in Tables 4 and 5 and the quantitative measurement thereof are results obtained from a part of the total attached area of about 200 cm ² (the reason is that performing the entire attached area requires a huge amount of work. And there is no other reason.).

From Tables 4 and 5, it is estimated that 18 kinds of marine plants such as seaweed and 22 kinds of marine animals adhered to the aquatic product growth medium 15, and a total of 40 or more organisms adhered. On the other hand, one marine plant adhered to the control block.
It is estimated that 0 species and 21 species of marine animals had a total of 31 or more species attached. Although the number of aquatic animals adhered is not much different between the aquatic product growth medium 15 and the control block, it is characteristic in the species composition. Aquatic product growth medium 1
In No. 5, many foraminifers, quails, polychaetes, and lobsters were found, and in the control block, the number of barnacles was extremely high.

From this type of construction, the aquatic product growth medium 15
What can be said about is that it has provided a favorable environment for the growth of seaweed because many types of seaweed were attached. It has proven to be useful as a habitat for marine animals, such as childcare. The reason why many seaweeds propagated in the aquatic product growth medium 15 is that the invisible hand of seaweed trying to prosper the seeds by incorporating various minerals contained in the shell fossils, whereas the control block It should be said that aquatic products that can withstand the strong alkalinity of concrete itself have adhered.

Next, a study was conducted to confirm the effect of improving the water quality of the heat-treated shell fossils present in a mixed and solidified state with the aquatic product growth medium, and the situation will be described. Example 2 A predetermined amount of heat-treated shellfish was sprayed on the surface of bottom mud in the sea area of a fish farm, and after a certain period of time, COD, sulfide, ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in the bottom mud were measured. The rate of dissolution of these chemicals from the sediment is measured. 1. One section of the measurement location, Wakayama Prefecture Shirahama-cho, Koga Ura waters and 10m ^2, 4
It is a section. 2. Spraying amount of heat-treated shell fossil A: spraying area of 0.5 kg / m ² , B: 2.0 kg / m ^2
2. C: 5.0 kg / m ² spray area; D: No-spray control area 3. days from spraying to collection 28 days Method of collecting bottom mud Collected as a core using a KK type columnar mud sampler. 5. Sediment analysis method COD (chemical oxygen consumption)-by the alkaline potassium permanganate method. Total sulfide-After steam distillation, colorimetric determination using paraphenylenediamine. Ammonia nitrogen-According to Nimura's Indophenol method. Nitrite-nitrogen-based by a colorimetric method using α-naphthylamine and sulfanilamide. It was determined as nitrite nitrogen using a nitrate-nitrogen-cadmium-copper column reduction method. Phosphoric acid phosphorus-Molybdenum blue method. 6. Dissolution test For each of ammonia nitrogen and phosphate phosphorus,
The concentration of bottom mud pore water and the concentration of water directly above were measured, and the elution rate was calculated from the concentration gradient by the method of Kamiyama et al.

Table 6 shows the results of the analysis of the bottom mud.

[0045]

[Table 6]

According to Table 6, the concentrations of ammonia nitrogen and phosphate phosphorus were higher in the surface layer (0 to 2 cm) of the bottom mud than in the control. From this fact, it is considered that a considerable amount of water was eluted from the unsprayed sediment into the water directly above the water, whereas the elution was suppressed in the sprayed area. On the other hand, regarding nitrate nitrogen and organic substances (COD and loss on ignition are used as indices), there is no tendency to suppress elution like ammonia nitrogen and phosphorous phosphorus.

In addition, a dissolution test was carried out on ammonia nitrogen and phosphorous phosphorus, which have a great effect on eutrophication of water areas, and the results are shown in Tables 7 to 9.

[0048]

[Table 7]

[0049]

[Table 8]

[0050]

[Table 9]

According to Tables 7 to 9, the dissolution rates of ammonium nitrogen and phosphoric acid phosphorus were clearly suppressed in the sprayed area.

Example 3 When heat-treated shell fossils were sprayed on the bottom mud surface in the sea area of a fish farm,
In order to measure the relationship between the amount of spraying and the elution rate of chemical substances eluted into seawater just above the sediment, a simulated in-situ method in which sediment is sampled from the sea area of the fish farm and tested in a laboratory Was performed. 1. Bottom mud collection location Kogaura water area, Shirahama Town, Wakayama Prefecture 2. 2. Amount of sprayed heat-treated shell fossils A: 0.5 kg / m ² spray area, B: 2.0 kg / m ² spray area, C: 5.0 kg / m ² spray area, D: non-spray control group Elution method After filling the bottom mud in a wide-mouthed glass bottle, inject seawater so that the bottom mud does not roll up, seal and shut off the air, 25 °
C for 4 hours. 4. 4. Surface area and thickness of bottom mud 34 cm ² , 3 cm Bottom mud straight water 450ml 6. 6. Measurement of dissolved oxygen content Dissolved oxygen meter Measurement of Elution Rate After keeping for a certain period of time, the amount of each of the chemical substances eluted in the Shanghai water was measured, and the elution rate was calculated. Tables 10 to 15 show the results of the test.

[0053]

[Table 10]

[0054]

[Table 11]

[0055]

[Table 12]

[0056]

[Table 13]

[0057]

[Table 14]

[0058]

[Table 15]

According to Tables 10 to 15, the ammonia nitrogen, the nitrite nitrogen and the phosphoric acid phosphorus were 0.5 k
A remarkable effect of suppressing elution was observed at an application amount of g / m ² . Further, it is more effective to suppress the phosphoric acid phosphorus and the COD value by increasing the application amount. No effect was observed for nitrate nitrogen. In addition, about each Example of this invention, the case of the sea was demonstrated, However, this invention is a river,
Needless to say, it can be applied to lakes, ponds, digging, and hanging moats.

[0060]

As described in detail above, the aquatic product growth medium of the present invention and the marine ranch using the same have the following effects. The invention according to claim 1 is characterized in that sulfides, COD, ammonia nitrogen, nitrite nitrogen, which are negative factors of the sediment and the surrounding water area due to the heat-treated shell fossils in the solidified matter,
Phosphoric acid phosphate is rapidly attenuated, does not affect the dissolved oxygen that is a positive factor, and does not raise the pH almost, so that a favorable environment for aquatic products is produced, and minerals contained in shell fossils are used. Due to the directional nature of the marine plants, the marine plants settle well on the solidified material and help reincarnation into a sea of fertility.

According to the invention of claim 2, the core can be changed to one having the above-mentioned effects together with the characteristics of the core already existing. Fossil use can be reduced and limited natural resources can be used for a long time.

According to the third aspect of the present invention, the aquatic plants are even better settled on the solidified product.

According to the fourth aspect of the present invention, marine animals tend to collect on solidified matter.

According to the marine ranch of the fifth aspect of the present invention, the characteristics of each aquatic product growth medium provide a favorable environment for aquatic products and the aquatic plants well settle on the solidified material. If you compare it to land-based pasture, good livestock can be raised where good livestock grows, and good marine animals can be used, and marine plants can be used effectively as a result, and as a result, the sea of fertility can be regained.

According to the sixth aspect of the present invention, in addition to the above-mentioned effects, the marine product growth medium does not run off or rotate and the marine plant grows well.

According to the seventh aspect of the present invention, in addition to the above-mentioned effects, the aquatic product growth medium is not buried or washed away,
It is particularly convenient when the seabed is sandy.

According to the invention of claim 8, in addition to the above-mentioned functions and effects, it is possible to provide a large concrete block with a good environment for aquatic products, and also to provide an effect of allowing aquatic plants to grow well on solidified products, It can contribute to the creation of a sea of fertility.

[0068]

[Brief description of the drawings]

FIG. 1 is a perspective view of an aquatic product growth medium showing an embodiment of the present invention.

FIG. 2 is a perspective view of an aquatic product growth medium showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a portion of an aquatic product growth medium illustrating another embodiment of the present invention.

FIG. 4 is a perspective view of an aquatic product growth medium according to another embodiment of the present invention.

FIG. 5 is a perspective view of an aquatic product growth medium according to another embodiment of the present invention.

FIG. 6 is a sectional view of a marine ranch showing an embodiment of the present invention.

FIG. 7 is a plan view of a marine ranch showing another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a marine ranch showing another embodiment of the present invention.

FIG. 9 is a perspective view showing a test aquatic product growth medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c Aquatic product growth medium 2, 17 Solidified material 3 Passage hole 4 Core body 5 Heat-treated shell fossil layer 6 Irregularity 7 Depression 10 Ocean floor 11 Seaweed bed 12, 12a, 12b Marine ranch 13 Large concrete block 14 Small Concrete block 15 Aquatic growth medium for testing 16 Circular hole 18 Handle

Claims (8)

(57) [Claims] 1. A shell fossil, which is formed by burying and accumulating various nekton, plankton, algae, seaweed and the like made of calcareous or silicic acid, and forming a humus-soluble crystal, at 170 ° C. to 270 °.
The heat-treated shell fossil obtained by heat treatment in the range of C to remove and activate the water of crystallization, at least an aggregate and a solidifying agent are mixed at a predetermined ratio and solidified into an arbitrary shape, and the solidified product is put into water. A marine product propagation medium characterized in that it is used as a breeding ground for marine products. 2. A marine product propagation medium comprising the heat-treated shellfish of claim 1 adhered to a core having an arbitrary shape. 3. The aquatic product growth medium according to claim 1, wherein the solidified material has irregularities. 4. The aquatic product growth medium according to claim 1, wherein the solidified product is provided with a depression and / or a passage hole. 5. A marine pasture, wherein the aquatic product growth medium according to claim 1, 2, 3 or 4 is charged and arranged on the seabed to create a seaweed bed. 6. A marine ranch constructed by enclosing a fixed section of the seabed with a large-sized concrete block, placing the aquatic product growth medium according to claim 1, 2, 3 or 4 in the enclosure, and creating a seaweed bed. 7. A small concrete block is placed and placed in an enclosure of the large concrete block, and the small concrete block is placed on the small concrete block.
A marine ranch constructed by charging and arranging the aquatic product growth medium described above. 8. The marine ranch according to claim 7, wherein said heat-treated shellfish is adhered to said large-sized concrete block.