JPH0646717A - Method for supplying oxygen for culturing fish and apparatus therefor - Google Patents

Abstract

PURPOSE:To efficiently apply dissolved oxygen into a water area for culturing fishes without shocking larval fishes, etc. CONSTITUTION:Water is pressurized with a pressurizing water feed pump 1 and air or oxygen is simultaneously mixed in the suction side of the pressurizing water feed pump 1 and dissolved under pressure. The pressurized and dissolved water is then dispersed, released and decompressed from a jet nozzle 4 in the inner base of a water tank 3 to produce fine bubbles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for replenishing water with oxygen, which is indispensable for fish farming in closed water areas such as aquariums, ponds, lakes and seas.

[0002]

2. Description of the Related Art Maintaining dissolved oxygen in water in fish culture is important for maintaining the growth environment of fish. Conventionally,
In order to supplement the dissolved oxygen in the fish culture water, surface aeration method, aeration method, sparger method, cascade method, ejector method and the like are used. These methods simply release or entrain air or oxygen in water, and bubbles in water have a macro shape, and the rate of being utilized as dissolved oxygen is extremely low, and also due to impact due to macro bubble collision. Moreover, especially fry suffered fractures and other physical damages, and in some cases, death. In addition, the surplus of food accumulated on the bottom of the water and the excrement of fish are easily decomposed, which leads to the production of toxic substances and is often fatally injured chemically.

[0003]

SUMMARY OF THE INVENTION The present invention does not simply release or entrain air or oxygen in water as in the prior art, but pressurizes and dissolves air or oxygen in water, and then this is placed in a low-pressure fish culture water area. It is an object of the present invention to provide a method and apparatus for supplementing oxygen for seafood culture that is capable of increasing the rate of dissolved oxygen by reducing the pressure to disperse it as fine air bubbles by releasing it into the.

[0004]

The present invention is a method for supplementing oxygen for fish farming, characterized in that oxygen-dissolved pressurized water is discharged to the bottom of the fish culture area and decompressed to generate fine bubbles. An oxygen supply device for fish farming, characterized in that the suction side of the pump is connected to the discharge port of an oxygen pump or an oxygen cylinder, and the discharge side of the pressurized water supply pump is connected to an injection nozzle provided at the bottom of the fish culture water area. .

[0005]

[Operation] A part of the aquaculture water or other water is sucked by the pressure water supply pump to pressurize it to ³ to 6 kgf / cm ² , and the air or oxygen supplied to the suction side of the pressure water supply pump is dissolved under pressure. Dissolved oxygen is given to the water, and the pressurized dissolved water is jetted to the bottom of the fish culture area to disperse the pressurized water and simultaneously reduce the pressure to simultaneously release excess air or oxygen into the water. The released air or oxygen becomes fine bubbles of micron order and is dispersed in water, and the specific surface area of the bubbles is large, so that oxygen is dissolved well in the aquaculture area, and the impact on fry does not occur. It is attached to excess food and fish excrement to reduce the apparent specific gravity and prevent it from staying at the bottom of the water, so that spoilage does not occur.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is 3 to 6 kgf / cm ^{2 of} water.
A pressurized water pump such as a plunger pump that supplies water under a certain pressure, the suction end of which opens into the water in the water tank 3 through the strainer 2, while the discharge end of which is through the injection nozzle 4 at the bottom of the water tank 3. The water supply pump 1 sucks in a part of the water in the water tank 3, pressurizes it, and jets it again from the injection nozzle 4 to the bottom of the water tank 3. Injection nozzle 4
Is a type that can disperse and discharge pressurized water in a wide range and sprays in one direction or in multiple directions. Further, the suction side of the pressurized water pump 1 is connected to an air pump 5 for supplying air or an outlet of an oxygen cylinder 6 via a control valve 7, and the negative pressure on the suction side of the pressurized water pump 1 and the air pump 5 or Due to the discharge pressure of the oxygen cylinder 6, it is mixed in the water sucked into the pressure water pump 1, and while passing through the pressure water pump 1, the oxygen in the air or the oxygen cylinder is pressure-dissolved and injected from the injection nozzle 4. When this is done, the pressure is reduced and the excess is released all at once, forming fine bubbles, and the oxygen in the water in the water tank 3 is efficiently dissolved. Since the released bubbles are minute, they do not damage the fish. In addition, the residual food on the bottom of the tank adheres to the fine bubbles and rises and does not stay. FIG. 2 shows another embodiment of the present invention, in which the pressurized water supply pump 1 sucks in the water inside or outside the net 8 surrounding the fish farming water, and the air or oxygen cylinder 6 from the air pump 5 is sucked.
Oxygen from is dissolved under pressure, released to the bottom of various fish culture areas, and decompressed to generate fine bubbles and give dissolved oxygen.

[0007]

As described above, according to the present invention, water in which air or oxygen is pressure-dissolved is dispersed at the bottom of a fish culture area,
When released, the excess pressure is uniformly dispersed as extremely fine bubbles by depressurization, there is almost no impact on fry, the rate of dissolved oxygen increases, and the efficiency of fish farming is greatly improved. It is also possible to prevent corruption such as.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a device of the present invention.

FIG. 2 is a structural explanatory view showing another embodiment of the device of the present invention.

[Explanation of symbols]

 1 Pressurized water pump 2 Strainer 3 Water tank 4 Injection nozzle 5 Air pump 6 Oxygen cylinder 7 Control valve 8 Net

Claims (2)

[Claims] 1. A method for supplementing oxygen for fish farming, which comprises releasing oxygen-dissolved pressurized water to the bottom of a fish farming area and decompressing it to generate fine bubbles. 2. The suction side of the pressure water supply pump is connected to the discharge port of an air pump or an oxygen cylinder, and the discharge side of the pressure water supply pump is connected to an injection nozzle provided at the bottom of the fish culture area. Oxygen supply device for fish farming.