JPH0751030B2 - Fishing bait aquaculture equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aquaculture device suitably used for breeding rotifers belonging to the polychaete annelids.

[Prior Art] Rockworms, dolphins and the like are suitable as prey for high-grade fish for sea fishing. At present, these fishing baits are exclusively collected from the habitat and marketed. However, due to destruction of the habitat, pollution or overfishing, the habitat and the amount of collection are decreasing year by year. In particular, it is said that it takes 2-3 years for the crocodile to grow in the natural world, so a stable supply throughout the year is impossible.

For these reasons, it has recently been considered to cultivate fishing insects such as rotifers and kaikai.

The inventors of the present invention have previously disclosed Japanese Patent Application Nos. 58-115229 and 61-173768.
And a Japanese Patent Application No. 62-71360 proposed aquaculture tank for prey for fishing.

The invention described in Japanese Patent Application No. 58-115229 (hereinafter referred to as Reference 1) has a seawater supply room, a drainage room, and a breeding room between the seawater supply room and the drainage room in the water tank, and each room is at the bottom. The drainage chamber is divided into an upper running water drainage part and a lower running water drainage part.

The invention of Japanese Patent Application No. 61-173768 (hereinafter referred to as Reference 2) is
It is a water tank that is filled with a member (sand etc.) that can easily be opened in the divided inside of the water tank and flows in one direction.

The aquarium of the invention described in Japanese Patent Application No. 62-71360 (hereinafter referred to as Reference 3) is bred at one end of the aquarium, and at the other end opposite to the drainage chamber and between the seawater supply chamber and the drainage chamber. In the aquaculture device provided with the chamber, the seawater is forcibly circulated and used, and the ebb and flow is automatically performed.

[Problems to be Solved by the Invention] However, since the aquarium of Reference 1 has a breeding chamber between the seawater supply chamber and the drainage chamber, the normal flow of seawater is a static planar flow of upper and lower layers. Therefore, the water supply in the breeding room where the predators live is poor, and the dissolved oxygen required for growth cannot be supplied.
Moreover, in Reference Example 3, since seawater is forcibly sucked from the bottom,
Lots of predators leave during the larval stage. Further, in Reference Example 2, the seawater on the surface of the nursery layer is partially stagnant, so that organic substances such as algae and feces are deposited, the water communication in the breeding room is deteriorated, and the water level rises to exceed the dam plate on the drainage room side.

Further, in these inventions, since the seawater supply chamber or the seawater supply unit and the drainage chamber are provided inside the water tank, the effective breeding area is reduced accordingly, and the water tank becomes large.

Technical Problem The present invention has a technical object to obtain an aquaculture device for a bait for fishing from a larva of a bait for fishing such as sardines and oysters to an adult of a product size in a short period of time with high efficiency and high density. I am trying.

[Means for Solving the Problems] In order to solve the above technical problems, in the aquaculture device of the present invention, a porous member is provided on a nesting tubular member group that is a breeding room for fishing bait. In a seawater circulation aquaculture tank with a seedbed layer in the middle section of the aquarium, the seawater inlet is installed at a position higher than the surface of the seedbed layer and to generate a swirling flow in the seawater of the seawater layer horizontally with the seedbed layer and in the center of the aquarium. A drainage part having a drainage port for discharging both upper and lower layers of seawater was provided in the section.

More specifically, the above-mentioned aquaculture apparatus for bait for fishing is provided with a seawater inlet for producing a swirling flow in the seawater layer and, if necessary, a seawater circulation apparatus in the aquaculture tank of the present invention. The seawater circulation device takes in oxygen in the air into the water tank while circulating the seawater above and below the seawater layer, and a water wheel is preferable. Although a circulation pump can be used, in this case, it is more preferable to provide an aeration water tank outside the water tank. The seawater inlet is installed in a place where the swirl flow of the seawater is generated in the plane direction of the tank so that the seawater does not stagnate at any place on the nursery layer. The seawater inlet is in the seawater layer and its direction is parallel to the plane direction of the tank. When two pieces are provided on the diagonal line of a water tank having a rectangular plane, for example, the directions are parallel to the plane direction of the water tank and opposite to each other.

The amount of seawater to be introduced is small because the oxygen consumption is low during the larval stage of the prey, but as it grows, the oxygen consumption also increases due to the increase in the prey and phytoplankton, which requires a large amount of seawater. . However, in actuality, by rotating the water wheel, oxygen can be supplied sufficiently and the amount of water supplied is constant. The seawater introduced into the aquarium from the seawater inlet is either the factory drainage with high temperature used as cooling water or the water intake from the sea, but it can be used as a primary tank, secondary tank, aeration tank or fish. It is said to be suitable for breeding predatory insects via a fish tank or the like.

The seedbed below the seawater layer generally uses sand. It is preferable to change the grain size of the sand into two or more layers, and the thickness of the nursery layer is 5 to 15 cm.

A perforated member such as a perforated plate or net is installed under the seedbed layer to prevent the sand in the upper part from falling into the tubular member for nesting in the lower part and clogging. The material of the net may be natural fiber or synthetic fiber, and the size of the mesh is about 10 to 20 mesh.

The tubular member for nesting, which serves as a nest for predatory insects, has an inner diameter of about the same as the size of an adult, and in the case of worms, it is about 5 to 8 mm and the length is about 30 to 50 cm. The cross-sectional shape is not particularly limited, such as circular, triangular, or polygonal. The nesting tubular member forms a member group, and may be an integrally molded product having a large number of tubular holes, such as a plastic cardboard plate, or a single hole tubular assembly. However, the inclination angle of the nesting tubular member is preferably in the range of 10 to 30 °. If it is less than 10 °, the number of nesting holes per unit area is small, and if it is more than 30 °, larvae often drop off from the lower end of the member, both of which lead to a decrease in prey yield.

Furthermore, the upper layer flow of the aquaculture aquarium of the present invention normally swirls in the aquarium, passes through the seed bed layer, the porous member, and the nesting member from the whole area of the nursery layer to become a lower layer flow. Also, by raising the seawater level, only the surface water is discharged from the upper stream discharge port,
The rest can be a down stream as described above. Further, the upper layer flow and the lower layer flow are discharged at the center of the water tank.

By providing the discharge part in the center of the aquarium, the seawater in the seawater layer swirls through the discharge part in the center of the aquarium, making it easier for the seawater to flow. The stagnant part disappears. That is, the effect of preventing oxygen deficiency is further enhanced. The flow of seawater from the seawater layer, nursery layer, and porous member through the nesting tubular member to the seawater outlet is unidirectional from the top to the bottom, and because there is a nursery layer (sand tank), feces , Organic matter is deposited on the nursery bed. These feces and organic matter become plants in the food chain and are reused as food, and the aquarium is always kept clean. In addition, the pollution of the local sea surface can be prevented and the feed effect is significantly improved. Further, by providing the upper stream drainage outlet, it is possible to easily discharge, for example, diatoms that are separated from the surface of the nursery layer and float on the water surface.

[Operation] By providing the seawater inlet of the present invention at a position higher than the surface of the nursery bed and horizontally to generate a swirling flow in the seawater layer, the seawater on the surface of the nursery layer is always kept in the breeding room. Since it circulates and circulates over the entire area, there is no stagnation of seawater and dissolved oxygen is distributed almost evenly. In addition, the top of the water wheel,
The downward one-way circulation flow improves the water exchange in the habitat of the predators living in the sand and prevents oxygen deficiency. Therefore, it promotes moderate algae generation and organic matter deposition on any part of the nursery surface to create a habitat that is rich in nutrients and oxygen. In addition, since the method of draining seawater by providing a drainage section having a drainage port for discharging both upper and lower layers of seawater in the center of the water tank is not a method of forcibly sucking in seawater,
The predators do not drop out of the nest so that they do not leave. Further, since it is not necessary to provide a seawater supply room and a drainage room, the water tank can be effectively used.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention, and FIG. 1 of the accompanying drawings is a plan view showing a preferred embodiment of the aquaculture tank of the present invention used for cultivating rotifers. FIG. 2 and FIG. 2 are sectional views taken along the line AA of FIG.

The aquaculture tank 1 has a seawater layer 2 when used for aquaculture.
Have. At one end of the upper part of the aquarium that becomes the seawater layer 2, a seawater circulation device, that is, a water wheel 3 is provided for circulating the seawater of the upper seawater layer 2 from the upper part to the lower part of the habitat for prey. Separated from the nursery layer 8 in the upper seawater layer 2 and in the upper seawater layer 2
A seawater inlet 4 is provided on the upper side of the
On the plan view, they are on the diagonal line and are opposite to each other.
Seawater is always introduced into the aquaculture tank 1 from the seawater inlet 4, the drainage reaches the upper part of the outlet 5 through the seawater outlet 6 at the lower end of the outlet 5, and the drain pipe 7 goes out of the tank. Is discharged. Since the discharge part 5 is located at the center of the aquaculture tank 1 and its upper end is above the upper seawater layer 2, the seawater introduced from the seawater inlets 4 in opposite directions is indicated by an arrow in FIG. As shown, it helps to swirl the flow of the seawater layer 2 around the discharge part 5.

The amount of introduced seawater (seawater flow rate) is 100 to 150 / Hr / m ² per unit surface area of the seawater layer 2 (unit area of the aquarium), and the larval stage is small and the adult stage is large according to the oxygen requirement of prey. Become. Seawater temperature is usually 15-25 ° C.

The water turbine 3 is a simple seawater circulation device that circulates the seawater in the seawater layer 2 up and down, takes in oxygen in the air, increases the amount of dissolved oxygen in the seawater, and equalizes it.

Below the upper seawater layer 2 is a sand nursery layer 8 of about 10 cm, and below the nursery layer 8 is a porous member 9 made of a synthetic fiber net for preventing sand from falling.

The nesting tubular member 10 is a plastic plate-like member in which circular tubes having a cross-sectional shape of about 5 mm in diameter and 30 cm in length with both ends open are arranged in a row, and shown in FIG. like,
Install at a tilt angle of 20 °, stacking multiple stacks.

Using such an aquarium, the rotifer was cultivated, and the yield was significantly higher than that when a conventional aquarium was used.

[Effects of the Invention] By using the aquaculture aquarium of the present invention as described in detail above, a markedly higher yield of aquaculture can be achieved as compared with the prior art. That is, in the present invention, the annual yield per unit area of the water tank is 25 to 35 kg / m ² weight unit, but in Reference 1, 5 to 10 weight units, in Reference 2 7 to 12 weight units, and in Reference 3, 10 to. It is 15 weight units.

The reason for this is that the seawater flow in the seawater layer becomes a gentle swirl flow, and there is no place where the seawater stagnates at any position on the surface of the seed bed layer, and the dissolved oxygen is supplied almost evenly, and the seed bed layer below this is evenly distributed. A large amount of flow, feces, residual food, and organic matter are all retained in the sand tank and are reused by the food chain to improve feed efficiency significantly, keeping the tank clean at all times, tubular for nesting The inclination angle of the member 10 is 10 to 30 ° to prevent the predators from falling off during larvae, increase the nesting rate, and increase the effective breeding area by excluding the seawater supply chamber or drainage chamber from the tank It is possible that

Therefore, the increase in yield per unit area of aquaculture tank is
Since the small amount of capital investment brings a large amount of sales and the wastewater treatment cost is not required, the technical value in the industrial aquaculture technology of the bait for fishing of the present invention is very large.

[Brief description of drawings]

FIG. 1 is a plan view showing a preferred embodiment of the aquaculture device of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1 ... Aquaculture tank, 2 ... Seawater layer, 3 ... Water wheel, 4 ... Seawater inlet, 5 ... Discharge part, 6 ... Seawater discharge port, 7 ... Discharge pipe, 8 ... Nursery layer, 9 ... Porous member, 10 ... Cylindrical member for nesting.

Claims (1)

[Claims] 1. In a seawater circulation aquaculture tank in which a nursery layer is provided in the middle stage of a water tank via a porous member on a group of tubular members for nesting, which is a breeding room for fishing bait, a seawater inlet is provided from the surface of the nursery layer. It was installed at a high position so as to generate a swirling flow in the seawater of the seawater layer horizontally with the seedbed layer, and a drainage part was provided in the center of the tank with a drainage outlet for discharging both the upper and lower layers of seawater. An aquaculture device for a bait for fishing characterized by the above.