JPH0249689B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention can be used sequentially in each process such as spawning, hatching, and rearing of young fish of Japanese loach, or can be used for each process separately. Regarding the dojiyo culture equipment used exclusively for each.

(Conventional technology) Conventionally, in order to cultivate loach fish, especially young fish, an appropriate amount of fish is placed in one aquarium, fed with chicken egg yolk, and the water quality and temperature of the aquarium are controlled during this time. Because leftover food rots and pollutes the water, aquaculture equipment is used that constantly adds fresh water and drains waste water.

(Problem to be solved by the invention) Various studies have been conducted on the technology for hatching locusts, and in recent years, researchers have developed methods for attaching fertilized eggs to the hairs of locusts and placing them in flowing fresh water. As a result, it has become possible to hatch in the most efficient manner. Although it has become possible to obtain a large amount of fry in this way, the current situation is that in the conventional aquaculture equipment described above, when wastewater is discharged, fry are also discharged at the same time, resulting in poor yield. It would be possible to insert a fine mesh filter at the outlet of the tank to prevent the fry from being discharged, but at the same time it would not be possible to discharge putrefactive substances, increasing the level of sewage pollution and increasing the number of dead fish. Therefore, they are farmed by allowing the loss of their weight due to runoff, but this was considered the biggest difficulty in farming loach.

The present invention aims to solve the above problems and to research and develop a culture tank device that can improve efficiency.

[Structure of the invention]

(Means for solving the problem) First of all, the water in the tank must be maintained at a quality suitable for aquaculture without draining it, and the water in the second tank should always be kept at a temperature suitable for aquaculture. It's about preserving.
In order to meet the first requirement, it is of course necessary to make the water flow and add oxygen, but the problem is how to prevent leftover feed from spoiling, and unless this can be solved, it is impossible to implement it. be. Therefore, he conducted research on food that would not spoil and was good for raising Japanese locusts. As a result, when activated chlorella was administered, the growth of locusts was extremely good, and there was no rotting at all, and although the water turned green, it was able to be maintained in the same way as fresh water. Furthermore, after the fish had grown to about 1 cm in length, by administering a culture solution containing particulates, we were able to maintain good water quality and accelerate growth, resulting in good growth. From the above results, fish can be raised to adulthood without changing the water in the tank at all. By the way, since the water is not replaced, the water temperature is greatly affected by the outside temperature, so it is necessary to satisfy the second requirement.
Natural locusts stop growing in the winter and summer, but by keeping the water temperature around 20°C, they can be kept throughout the year. There are many ways to keep the temperature at an appropriate temperature, but in addition to taking industrial needs into consideration, there is no need to replace the water for aquaculture at all, so it is possible to use solar heat, groundwater, river water, hot springs, etc. even if the water is turbid and unsuitable for aquaculture. Even with water, it is most advantageous to utilize their natural heat.

Based on the above research, we devised a device that allows for successful aquaculture.In other words, multiple aquaculture tanks are installed in an outside aquarium, each aquaculture tank is connected in series with a siphon pipe, and the aquaculture tanks at both ends of the series are connected. They are connected via a pump.

(Function) River water or groundwater is poured fluidly into the outside aquarium to keep the water temperature in the aquaculture tank at an appropriate level. Inside the aquaculture tank, fresh water is kept constantly flowing in each tank using siphon pipes and pumps. , which is cultivated by administering chlorella or chlorella to it.

(Example) The locust culture tank device of the present invention will be specifically explained. As shown in FIGS. 1 and 2, several rows of aquaculture tanks 2 are arranged at intervals in an outdoor aquarium 1, and the height of the aquaculture tanks 2 is set at a height of 1.
The culture tanks 2 arranged in a row are connected to each other by a siphon pipe 3. This siphon tube 3
has a deaeration port 5 via a valve 4, and according to experiments, locusts with a diameter of about 10 cm can be moved to the adjacent aquaculture tank 2 through the siphon pipe 3, and due to the movement. It is extremely desirable for aquaculture as it allows for exercise. Furthermore, a water supply pipe 6 is provided to the culture tank 2 at one end of the culture tank row, and a water level setting tank 7 connected to the culture tank 2 at the other end by a siphon pipe 3 is provided. Therefore, water is injected from the water supply pipe 6, and each siphon pipe 3
When the air inside is removed, water is supplied to each of the series of aquaculture tanks 2, and excess water overflows from the water level setting tank 7, and each tank 2 is filled with water.
water level can be kept constant.

Furthermore, the aquaculture tanks 2 at both ends of the series are connected by a connecting pipe 8, and a pump 9 is interposed between the connecting pipes 8 to flow the water in each aquaculture tank 2. Incidentally, it is preferable that the connecting pipe 8 is made smaller in diameter than the siphon pipe 3 to prevent the inflow of young fish as much as possible. Further, an aeration outlet 10 and a feeder 11 are provided in all or several of the culture tanks 2.

It is preferable to install the aquaculture device having the above structure in a plastic greenhouse, and first, locusts are hatched in the aquaculture tank 2. In this case, fresh water is injected into each culture tank 2 and communicated with each other through the siphon pipe 3, and the pump 9 is driven to flow the fresh water, and oxygen is further supplied by aeration. On the other hand, river water or groundwater flows into the outside aquarium 1, and the temperature of the fresh water in the aquaculture tank 2 is kept at about 20°C. Under the above conditions, aquaculture tank 2
A fertilized egg of a dojiro that has been obtained naturally or artificially and is attached to the hair of a dojiro is placed in the egg. Since they will hatch in two days, we administer active chlorella that has been cultured with the hair removed from the whites, and a few days later, we give them small particles. The fry are raised in this way, and when they grow to 2 to 3 centimeters in length, they are transferred to an aquaculture pond (a pond made from improved rice fields, etc.) and cultivated to a predetermined size.

The above is an example of a system that is constantly used in a series of aquaculture processes, but it can also be used exclusively for spawning, hatching, and for adjustment according to a shipping plan for adult fish. By providing a suitable habitat, that is, fresh water containing oxygen and soil, and temperature, it is possible to spawn at regular intervals throughout the year. Therefore, if parent locusts are reared with the device of the present invention, they will always be provided with favorable conditions. and can encourage spawning. Furthermore, by discharging adult fish raised from aquaculture ponds into the apparatus of the present invention, it is possible to easily sort them by size or select parent fish.

〔Effect of the invention〕

According to the locust aquaculture device according to the present invention, the aquaculture tank is provided in the outside aquarium, and the water in the aquaculture tank is kept at an appropriate temperature using the water in the outside aquarium without changing the water in the aquaculture tank. Even if the fry are just hatched, they will not be scattered outside the tank, and can be kept in a condition close to 100%, excluding natural death. Furthermore, since spawning can be encouraged throughout the year, production of loach can be increased compared to conventional methods. Furthermore, the structure is simple, and temperature control can be obtained even from water that is turbid and unsuitable for rearing, such as natural river water or underground water, making it possible to significantly reduce the cost of producing locusts.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a locust cultivation apparatus according to the present invention, and FIG. 2 is a plan view thereof. 1...Outer aquarium, 2...Aquaculture tank, 3...Siphon tube,
8... Connecting pipe, 9... Pump, 10... Elation spout.

Claims (1)

[Claims] 1. A plurality of aquaculture tanks 2 inhabiting eggs or fish bodies are provided in an outside aquarium 1 containing water with a temperature suitable for loach culture, and each aquaculture tank 2 is connected in series with a siphon pipe 3, A dojiyo culture device characterized in that both culture tanks 2, 2 at both ends of the series are connected via a pump 9.