JPH02109930A - Rearing of underwater organism - Google Patents

Abstract

PURPOSE:To exterminate parasite without killing underwater organism such as goldfish by generating active oxygen for a long period of time with existence of granules of porous calcium silicate hydrate carrying hydrogen peroxide. CONSTITUTION:Main raw material composed of porous calcium silicate hydrate, preferably siliceous raw material and calcareous raw material is made to slurry- like. Foaming agent is added to said raw material and cured by steam at high temperature and high pressure, then resultant porous calcium silicate hydrate is shaped to granular material of 0.1-30mm, preferably 1-10mm diameter. Hydrogen peroxide is carried in said granular material and the material is set in water for rearing of underwater organism such as goldfish.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for growing aquatic organisms (hereinafter referred to as organisms) such as eels, yellowtails, and goldfish in aquariums such as fish ponds.

[Prior art and problems to be solved by the invention] Conventionally,
As a method to exterminate parasites that have parasitized fish, etc., there is a method of directly introducing chemicals such as formalin into the fish pond or aquarium where the parasites are occurring, or a method of removing the parasitic fish in a formalin solution for a certain period of time. A method of medicinal bathing is used.

However, with this method, although it is effective in exterminating parasites, the reaction is temporary, so the range of usage is narrow; if even a little too much is added, the fish will die, and if it is too little, the exterminating effect will not be achieved. In addition, since the drug itself is toxic,
There is a problem in that it causes secondary contamination when used in large quantities. For example, when formalin is used in a greenhouse-type pond, formaldehyde vapor is generated, which irritates the mucous membranes of workers and causes nasal catarrh, conjunctivitis, and bronchitis.

Therefore, the present inventors conducted extensive research to find a method for exterminating parasites that has less impact on aquatic organisms and does not cause secondary pollution such as trihalomethane production or continuous loss of air pollutants, and has finally arrived at the present invention.

[Means for Solving the Problem] In order to achieve the above object, in the present invention, powder of porous calcium silicate hydrate carrying hydrogen peroxide is present in water for cultivating aquatic organisms. It is characterized by Here, porous calcium silicate hydrates include porous brandite, aphyllite, and porosity having a porosity of about 50 to 90%.
Those containing calcium silicate hydrate as a main component, such as tobermorite, xonotlite, and gyrolite, can be used. These hydrates have a diameter of 0.1 to 30 m, preferably 1 to 10 m.
Used in powder and granular materials of small diameter. Hydrogen peroxide is this hydrate 1
0.1-'l, Qcc, of a 30% aqueous solution is supported per g. The porous calcium silicate hydrate powder is obtained by slurrying the main raw materials of silicic raw materials and calcareous raw materials, adding a foaming agent to the slurry, and steam curing under high temperature and high pressure. When present, hydrogen peroxide can be easily dispersed throughout the water, which is preferable. In addition, porous calcium silicate hydrate is
When it is loaded with hydrogen peroxide and poured into water,
3I below the particle size of the carrier so that the carrier floats up and down.
Below rvR, 3~5#, 5~8In! This is done by appropriately translating from n18-12.

[Function] In the present invention, porous calcium silicate powder is used as a carrier for hydrogen peroxide, so hydrogen peroxide is absorbed into the voids of the powder. When the granular material that has absorbed hydrogen peroxide is placed in water contaminated with parasites, the water comes into contact with the voids in the porous calcium silicate, and calcium ions are eluted from the granular material. Then, this calcium ion and hydrogen peroxide react to generate active oxygen.

During this process, the elution of the calcium ions proceeds gradually, so that the generation of active oxygen continues even in water.

As a result, the extermination of parasites by active oxygen will continue.

Example 1 A slurry containing silicic raw materials and calcareous raw materials as main raw materials,
Hydrogen peroxide (concentration: 30% by weight) was added to 20 g of calcium silicate hydrate with a particle size of 5 to 8 # made of tobermorite with a high density of 0.5 obtained by adding a foaming agent and steam curing under high temperature and high pressure. '1Qcc was carried.

The entire amount of this hydrogen peroxide carrier was poured into 100 liters of fresh water in which 30 living goldfish with a large number of trichogynae were present. Then, the generation of active oxygen and Trichodyna parasitizing the goldfish were observed using a microscope. As a result, water comes into contact with the voids of the porous calcium silicate and calcium ions are eluted, and the calcium ions and hydrogen peroxide react to generate active oxygen for about 2 hours or more, during which time the support is It repeatedly rose and fell in the water, and the generation of active oxygen continued. As a result, the Tricodina parasitic on the goldfish was completely exterminated using active oxygen, and all the goldfish survived. Furthermore, when the phosphorus content in the water was determined before and after the experiment, it was found to have decreased from 2 ppm to 5 ppm.

Example 2 Calcium silicate hydrate 1ON having a particle size of 5 to 8 # made of tobermorite having a bulk density of 0.5 and having a bulk density of 0.5 as in Example 1.
ff was made to carry hydrogen peroxide (concentration: 30%) at 5Ω.

The entire amount of this hydrogen peroxide carrier is used in an eel pond (house circulation type outdoor pond, area 20
0yd, depth 80cm, 2 water turbines used, breeding ff12t
) in the square. As a result, the carrier generated active oxygen for more than 2 hours while floating up and down with the water flow.

After 24 hours, when the living eels were observed under a microscope, no Dactylogillus was found, and it was possible to completely exterminate them. Furthermore, all the eels were alive and there were no dead fish.

Test Example Next, regarding the safety of the present invention for fish, a comparison was made between calcium silicate hydrate in which hydrogen peroxide was supported and that in which calcium silicate hydrate was not supported. 0°10.20,50,75,1 as 82028 degrees in a 10Ω bucket
00 my/Ω, three goldfish were placed in it, and the survival status of the goldfish was observed. Here hydrogen peroxide 1
Calcium silicate hydrate (5 to 8 m) was loaded at a ratio of 2 parts to 2 parts. The results after 24 hours are shown in Table 1.

As shown in Table 1, when hydrogen peroxide is directly dissolved in water, there is a high risk of killing fish, and when high-concentration hydrogen peroxide is directly poured into fish ponds, the fish often die. . However, in the present invention, since the generation of active oxygen progresses gradually, the concentration around the feeding area does not become extremely high, so that parasites can be exterminated without killing the cultivated fish.

[Effects of the Invention] As detailed above, the present invention generates active oxygen over a long period of time without causing it to occur rapidly in a short period of time.
As a result, it exhibits an excellent effect of exterminating parasites without killing fish and the like.

Claims (1)

[Scope of Claims] 1. A method for cultivating aquatic organisms, characterized in that powder and granules of porous calcium silicate hydrate carrying hydrogen peroxide are present in water for cultivating aquatic organisms. 2 The porous calcium silicate hydrate powder is obtained by slurrying the main raw materials of silicic raw materials and calcareous raw materials, adding a foaming agent to the slurry, and steam curing under high temperature and high pressure. The method for growing aquatic organisms according to claim 1.