JPS5950289B2 - Method and equipment for breeding benthic fish - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for breeding benthic fish, and its purpose is to prevent deterioration of water quality in an aquarium, increase the housing density of benthic fish, and The aim is to use the organic matter generated as part of the feed.

Traditionally, the cultivation methods for benthic fish such as prawns have been roughly divided into three types: methods using abandoned salt fields, methods built on coastal embankments, and land-based aquarium methods. All of these methods involve feeding, and a sand layer is formed on the bottom. ing.

On the surface of the sand layer, organic matter such as leftover food and excrement is deposited, especially in large quantities when the housing density is high.
It tends to rot and turn into sludge, and is an element of adverse conditions such as the generation of sulfides and the growth of pathogenic bacteria.

Due to these conditions, the packing density has a close relationship with growth and yield, and in order to avoid these effects, it is necessary to keep the packing density low, or if the packing density is high, the organic matter is removed by large amounts of water exchange. A method is used to discharge the residue out of the system.

However, keeping the storage density low has a significant impact on production, and methods to prevent environmental deterioration due to high density storage and large volume water changes consume a large amount of energy such as electricity required for water changes, and generate organic residue. This leads to the loss of resource energy such as unused energy, and
These organic residues are released into the surrounding sea area, and are a contributing factor to the pollution of coastal sea areas.

This invention achieves the above-mentioned storage density and organic matter residue by effectively utilizing the organic matter generated by using a water tank.
This is an aquaculture method and device that eliminates the drawbacks of the conventional methods, allows for high-density housing, and saves on the amount of feed.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a circular water tank made of concrete blocks, iron plates, etc., and the bottom can be covered with concrete or a sheet of vinyl, rubber, etc., and a sand layer 15 is provided on the bottom.

Reference numeral 2 is a bridge in which a drive motor 11 runs on a running path 10 provided on the outer wall of the tank, centering on a pedestal 9 provided at the center of the circular water tank 1.
Due to the action of a drive device consisting of drive wheels 12, the vehicle always runs slowly at a speed of 1 to 5 revolutions per hour.

The bridge 2 is also provided with a swirling water pipe 3, a jet water pipe 4, an automatic feeder 13, a dissolved oxygen meter 14, and the like.

The swirling flow water pipe 3 has an injection nozzle, and by discharging the tank water supplied by the pump 5 from the injection nozzle in the tangential direction of the tank 1 in the form of a shower, a swirling flow is generated in the tank, which also serves as aeration. , all suspended solids are collected in the center of the tank.

The jet stream pipe 4 has a tip extending to near the bottom of the water tank, and the end has an injection nozzle divided into several pipes having an opening of 30 degrees toward the outer wall of the water tank in the longitudinal direction of the bridge 2. Then, a part of the tank water supplied by the pump 5 is spouted onto the surface of the sand layer 15.

In addition, the solenoid valve 16 is set by the timer setting to the swirling water pipe 3.
It is designed to be able to stop the flow into the jet water pipe 4 and inject the entire amount from the jet water pipe 4.

The suction port 17 of the pump 5 is provided at the lower part of the pedestal 9, and depending on the water flow, the water in the tank is sucked out through the water treatment part 6 provided in the pedestal 9, or is discharged to the drain port 18 during water change.

Furthermore, the pump 5 can also introduce fresh seawater via a pipe 23.

The water treatment section 6 is filled with a catalytic oxidizing material 24 made of synthetic resin or the like and having a surface area per unit volume of ioo to 200 m'/y and used for wastewater treatment.

Reference numeral 7 designates a blower for mixing air into the tank through an ejector 8 installed in the middle of the piping for circulating the water in the tank and injecting it into the tank.

However, the blower 7 is linked to a dissolved oxygen meter 14 provided in the tank through a control panel 19, and is designed to operate only when the amount of dissolved oxygen falls below a certain value.

The control panel 19 controls the automatic feeder 13, the solenoid valve 16, and the drive motor 11. Signals sent from these power sources and the dissolved oxygen meter 14 are sent to the control panel through a slip ring box 20 installed in the frame 9. It is connected with.

Furthermore, a net 21 is attached to the water treatment portion 6 on the side of the pedestal 9, and a cleaning brush 22 is installed to prevent the net 21 from clogging.
is attached to the bridge 2.

As described above, the present invention jets a jet containing air onto the water surface and sand layer surface using a swirling water pipe and a jet jet water pipe in an aquarium, and furthermore, rotates and moves the jet pipe within the tank.
The organic residue in the aquarium is constantly maintained in an aerobic state while being disturbed and suspended, preventing organic residue from stagnation, decay, and turning into sludge, thereby preventing environmental deterioration of the bottom sand layer, which is the main habitat of prawns. The entire bottom surface is maintained in this state.

In addition, floating and disturbed organic residues are collected in the center of the tank by the action of swirling flow, and are decomposed by bacteria, yeast, protozoa, and microalgae that naturally adhere to the contact oxidizing material filled in the water treatment section. , are converted into nutritional salts for phytoplankton, and some of these phytoplankton are used directly as food, and some are eaten by zooplankton, etc., resulting in the proliferation of zooplankton, but these animal groups are also used as food. It is used for natural purification using the so-called biological cycle.

Furthermore, the suspension of fine substances such as organic residues in the water obstructs the penetration of sunlight, and has the effect of preventing the growth of Ulva, Urticaria, etc., which quickly die and turn into sludge, on the tank walls and bottom.

In addition, during the above operation, 0.05~/
If an accumulation of 1 wet mud or more is observed, discharge the entire amount of water from the jet water pipe, diffuse it into the water, and raise the ammonia nitrogen concentration in the breeding water to 600μ? /
13 or when the nitrite nitrogen concentration reaches 100 μt711 or more, water should be replaced to a maximum of 30%.

The above-mentioned effects can be expected, but Table 1 shows the intermediate growth results of Kuruma shrimp seedlings for stocking. Generally, it is common to raise the fish to about the size of a tail, but in reality, sufficient intermediate growth is not possible due to natural and institutional conditions, and the yield is less than 50%, but according to the present invention, the yield is less than 50%. A yield of 76% was obtained despite the cultivation density of /m2.

Therefore, intermediate growth with a high survival rate is possible with a small amount of water exchange.

Table 2 shows the experimental results showing that the feed efficiency has been improved and high-density production has become possible.Organic residue is converted into feed, and the prawns grow while ingesting it as part of the feed. In addition to the fact that various nutritional sources that cannot be supplemented through feed are ingested, it is possible to save a large amount of feed costs.

As described above, according to the aquaculture method and apparatus for water treatment according to the present invention, re-feeding through the food chain has an extremely large effect on the purification effect, antibacterial effect, feed quality, growth, and yield.
This has the effect of preventing self-contamination of breeding water and contamination of nearby waters, and at the same time reducing energy loss in a compounded manner.

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[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention. FIG. 2 is an overall view of a part of the same as above (the device showing the inside). DESCRIPTION OF SYMBOLS 1...Circular water tank, 2...Bridging, 3...Swirling water pipe, 4...Jet jet pipe, 6...Water treatment section, 9...
- Frame, 15... Sand layer, 17... Inlet, 24...
- Contact oxidizing material.

Claims (1)

[Claims] 1. In a circular aquarium having a sand layer on the bottom, water in the tank is sucked out and a part of it is injected onto the surface of the sand layer to prevent organic residue from accumulating or stagnation on the surface of the sand layer. is injected in the tangential direction to create a swirling flow in the tank, which moves the suspended organic residue to the tank water suction hole in the center of the tank, and removes bacteria attached to the contact oxidizing material filled there.
A cultivation method for benthic fish that uses yeast, protozoa, and microalgae to convert organic residue into nutrients for phytoplankton. 2. Spread sand on the bottom of the circular water tank, bridge the pedestal placed in the center with the outer wall of the tank, and use the pedestal as a central fulcrum to pivot horizontally. When the feeder is installed, the swirl water pipe has an injection nozzle oriented tangentially to the tank, and the jet jet water pipe has an injection nozzle facing the sand layer surface, and these water pipes are connected to the water suction pump in the tank through a compressed air ejector, and are connected to the central pedestal. This is a demersal fish aquaculture device with a water treatment section filled with contact oxidizing material at the bottom, and a tank water suction hole through it.