JPS6296027A - Breeding of dojo - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for cultivating locust, which is a type of freshwater fish.

(Conventional technology) Loach farming usually involves using rice paddies and ponds as they are, artificially modifying rice paddies, ponds, etc. to create aquaculture ponds, or constructing and establishing dedicated aquaculture ponds. This is done in a similar manner.

(Problems to be solved by the invention) By the way, aquaculture using ponds and marshes as is is difficult to manage and is not common, and even when using rice fields,
If rice paddies are used as they are, there are many accidents in which the locusts escape from the rice paddies during breeding, and one of the most difficult conditions in cultivating locusts is to prevent them from escaping. , -ff is said to have a maximum yield of 75% by using ponds and paddy fields.

Therefore, in order to prevent loach from escaping, it is necessary to use artificial techniques to create aquaculture ponds in rice fields, or to construct dedicated aquaculture ponds.
This will require a large amount of expense.

In addition, in order to raise locusts, it is difficult to control water quality such as water temperature, water volume, and dissolved oxygen content, and in winter, the locusts go dormant and overwinter due to the temperature drop, so productivity is zero during this period. Although there are ways to solve each of these problems, there is a concern that this will affect the production cost and result in very expensive locusts even if they are bred in good condition.

(Means for Solving the Problems) In view of these points, the present inventors have determined that the locusts do not escape during cultivation, that the water quality used for cultivation is appropriate, and that they do not go dormant over the winter. As a result of intensive research into an aquaculture method that would allow year-round rearing, we decided to use the aeration tank in the intermediate process of wastewater treatment using the activated sludge method as a fish tank, and to cultivate loaches in Ko-X, achieving our goal. This is the result of the present invention.

(Function) Wastewater treatment using the activated sludge method is a well-known process in which sewage and activated sludge are mixed and stirred, and air is blown into the mixture to supply oxygen, so-called aeration. This is a chemical treatment method, and this aeration causes aerobic bacteria to proliferate in the wastewater, and these bacteria promote oxidation in the wastewater. Organic matter that has undergone oxidative decomposition in this way sinks together with bacteria,
Clear drainage water is left in the upper layer, and this sediment is mud-like and contains a large amount of aerobic M bacteria with a large amount of oxidizing power, so it is added to the new drainage water. Oxygen is supplied to the plant, and wastewater is treated in the process described above. In this activated sludge method, the wastewater is heated in a sprinkler door in the treatment process, and the air that is blown into the aeration tank is compressed by an air compressor. As a result, the air is heated, and this air is blown into the treated wastewater, which in turn warms the treated wastewater and makes it more suitable for use in the Kanto and Tokai regions. To the west, treated wastewater is said to have a temperature of around 20°C even in winter.

The temperature of this treated wastewater is around 20℃ even in the winter, which means that when cultivating loaches, they must be placed in an environment where they will not go into hibernation over the winter due to a drop in water temperature, making it possible to farm them all year round. It is what happens.

In addition, condensed air is blown into the aeration tank to promote the growth of aerobic bacteria, so the amount of dissolved oxygen in the wastewater is appropriate, which is considered to be a suitable condition for cultivating locusts. Daphnia etc. breed in considerable quantities, which can be used as food for loaches, and sufficient fattening is possible without the need for special feed. It can be said that it has uniquely favorable conditions for cultivating oysters.

(Example) Next, in order to explain the present invention in more detail through Examples, an outline of wastewater treatment by the activated sludge method is shown in the attached drawings.
After that, the sludge in the waste water is precipitated from the sprinkler door bed C1 to the sedimentation tank D1, and the waste water is further processed in the same way as the previous treatment from the sprinkler door bed C2 to the settling tank D2, and the waste water from the settling tank D2 is aerated. The wastewater reaches tank B, where air is blown into the wastewater and aerobic bacteria are actively bred.This aerobic bacteria breeding is not limited to the aeration tank, but is also carried out in water spray doors and other areas up to the aeration tank. There is no need to explain that they also breed in 7 aeration tank E.
The wastewater flows from the sedimentation tank D3 to the coagulation and sedimentation tank F, and then passes through the activated carbon adsorption tower G and is sterilized in the sterilization pond (■), where it is discharged as clean water. The process is from CI to DI, then C
The process is repeated twice from 2 to D2, but this is 2
It is not limited to once, but may be three times or more. In addition, sedimentation pond DI, D2. D3. The sediment from ``Ii'' is concentrated in a sludge thickening tank J, dehydrated, incinerated, and disposed of.
6 Furthermore, since the precipitate contains a large amount of aerobic bacteria with a large amount of oxidizing power, a portion of this is added to the new wastewater and the wastewater is treated in the above treatment process.2 The present invention During the treatment process, the cultivation of loach is aerated by blowing air from the nitrogen compressor into the waste water in the tank through the air pipe, which promotes the growth of aerobic bacteria. The temperature of wastewater is around 20°C in winter and around 30°C in summer.This is because, apart from summer, even in winter, the temperature of wastewater rises slightly as it passes through the sprinkler floor, etc. The air is heated and flows into the aeration tank, but the temperature is raised by L during aeration in this aeration tank, and the kneading is because the air blown into the air is heated to be compressed by the air compressor. Therefore, a water temperature of 20℃ to 30℃ is the optimum humidity for loach growth.
Also, make sure to aerate and always use 4 to 5 points during drainage.
The presence of PM and sufficient dissolved oxygen makes it suitable for loach growth.

Furthermore, in the waste water in the aeration tank, microorganisms breed using the organic matter in the gill waste water as a nutrient source, and Daphnia and the like use this as a nutrient source, and these are used as they are as food for the loaches. There are two methods for cultivating loaches in an aeration tank: one is to raise the loaches as they are in the aeration tank, and the other is to put them in cages, nets, etc. and use them as breeding containers and immerse them in the aeration tank. When rearing them directly in an aeration tank, the inlet and outlet of waste water should be covered with wire mesh, etc., to prevent the moths from escaping. When rearing in an aeration tank, it is recommended to keep the following in mind. In other words, this applies not only to loaches but also to fish in general, but when stocking, it is desirable to minimize differences in water temperature before and after release, and to avoid drastic changes in water quality. It is best not to allow too much change; loaches can die due to drastic changes in their environment. For this reason, it is best to tame the fish for 2 to 5 days in an aquarium with the appropriate water temperature and water quality, and then release the fish into an aeration tank.

If the breeding experiment by the present inventors is carried out, loach fry 3
,500? 8,750? The weight was 2.5 times the weight at the time of breeding. During this period, no special feed was administered, and the naturally growing Daphnia in the aeration tank were the source of nutrients. This breeding is carried out from April to July.
(Effects of the Invention) As explained in detail above, the present invention provides that the aeration tank used in the wastewater treatment process using the activated sludge method is constructed of concrete, etc. Therefore, even if you raise the locusts directly in the tank, you can easily prevent the locusts from escaping from the tank by simply treating the wastewater inlet and outlet, so there is no need to worry about a drop in yield due to escape. The water temperature in the aeration tank is the optimum temperature for raising loaches, L-, even in winter.1. Since it is difficult to go down, there is no need to worry about causing the loaches to go into winter dormancy, and year-round breeding is possible.Furthermore, the water contains enough dissolved oxygen to nourish the organic matter in the wastewater. This is an epoch-making invention that solved the difficulties in loach farming, such as the ability to use loach farms as a source of food, and the domestic production of loaches increased from 867 tons in 1980 to 781 tons in 1981, and to 781 tons in 1981. 712 tons, decreasing year by year to 647 tons in 1959, and on the contrary, the current situation is that the degree of dependence on overseas countries such as South Korea, China, Taiwan, and Hong Kong is increasing, and the fairy tale of this invention is extremely significant. There is.

[Brief explanation of drawings]

The accompanying drawings are process diagrams showing an example of wastewater treatment by an activated sludge method in which the method of the present invention is implemented.

Claims (1)

[Claims] A loach cultivation method characterized by raising loaches in an aeration tank used as a fish tank in the intermediate process of wastewater treatment using the activated sludge method.