JP3983743B2 - Hatching induction device - Google Patents

Description

The present invention relates to a hatching induction apparatus that is mounted on or integrally provided with a hatching tank that trains fertilized eggs (egg eggs) such as pupae and pupae before hatching.
Specifically, the present invention relates to a hatching induction apparatus suitable for suppressing the occurrence of aquatic bacteria (cottonous fungi) and oval softening during the hatching period.

  Conventionally, as this kind of hatching induction device, by placing the water level on the water supply side higher than the water level of the drain outlet in the hatching tank, the amount of water supply into the hatching tank is increased and forced water flowing, The upwelling flow will forcefully pass between the eggs to increase the oxygen supply, reduce the occurrence of aquatic fungi and egg membrane softening, and not to exceed the water level of this drain By providing a lid-shaped egg-floating prevention net that closes the upper opening surface of the hatching tank, even if the amount of water supplied into the hatching tank is increased, there are those that prevent the egg from rising or floating (for example, Patent Document 1).

Utility Model Registration No. 2551242 (page 2-3, FIG. 1 to FIG. 4)

However, in such a conventional hatching induction device, forcibly flowing the amount of water supplied into the hatching tank, the seed eggs stacked and accommodated in multiple layers are generally pushed toward the egg suspension prevention net, In particular, the upper layer egg close to the egg-floating prevention net is sandwiched between the egg-floating prevention net and the lower layer egg and is crushed in the vertical direction, and this compression deformation continues for a long time, There was a problem that a malformed fry had a high probability of hatching and a high mortality rate during the fish farming period.
In addition, in order to force the upwelling water to pass between the eggs vigorously, it is necessary to continue to supply a large amount of water, so it cannot be installed in places where it is difficult to secure water, and there are abundant installation locations. There was also a problem that it was limited to a new place.

The invention according to claim 1 of the present invention aims to suppress the occurrence of oval softening and the generation and breeding of aqueous bacteria even if the amount of water supplied to the hatching tank is small.
In addition to the object of the invention described in claim 1, the invention described in claim 2 aims to minimize the adverse effects on the eggs by the movement while simplifying the moving structure of the moving body in water. .
In addition to the object of the invention described in claim 1 or 2, the invention described in claim 3 is intended to enable easy installation in an existing hatching tank.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention has an underwater moving body that moves at a substantially constant speed inside a hatching tank in which a large number of eggs are stacked and stored. All of the eggs in the hatching tank are forcibly moved by the movement of the underwater moving body, the relative positions of these eggs are rearranged, and a water supply channel is formed between them.
The invention described in claim 2 is characterized in that, in addition to the structure of the invention described in claim 1, a structure is provided in which a blade is provided on the underwater moving body and the blade is continuously rotated at a low speed.
The invention according to claim 3 is the structure according to claim 1 or 2, wherein the underwater moving body is formed in a shape extending in the vertical direction, and is inserted from the upper opening surface of the hatching tank and moved in the lateral direction. It is characterized by adding.

According to the first aspect of the present invention, an underwater moving body that moves at a substantially constant speed is disposed inside an incubation tank in which a large number of eggs are stacked and stored. By forcibly moving all of the eggs, rearranging the relative positions of these eggs and forming a water channel between them, fresh water is supplied to the various eggs through each water channel. The aquatic bacteria that have proliferated in the mold shape by separating the good eggs from the dead eggs are cut off.
Therefore, even if there is little water supply to a hatching tank, generation | occurrence | production of an egg membrane softening disease, generation | occurrence | production, and reproduction of an aqueous microbe can be suppressed.
As a result, compared to the conventional one that forcibly feeds the water supply to the hatching tank, the eggs will not be pressed and deformed for a long time, so the probability of malformed fry hatching and the mortality during the fish breeding period can be greatly reduced. At the same time, since the amount of water supply is greatly reduced, it can be installed even in places where it is difficult to secure water, and the installation location is not limited.

In addition to the effect of the invention of claim 1, the invention of claim 2 is a regular continuous motion in which the movement of the egg is slow by continuously rotating the blades protruding from the underwater moving body at a low speed.
Therefore, the movement structure of the underwater moving body can be simplified, and the adverse effect on the eggs by the movement can be minimized.
As a result, the occurrence of malformation can be prevented at low cost.

In addition to the effect of the invention of claim 1 or 2, the invention of claim 3 has a structure in which the underwater moving body is formed in a shape extending in the vertical direction and is inserted from the upper opening surface of the hatching tank and moved in the lateral direction. Thus, if the upper surface of the hatching tank is open, it is possible to retrofit the underwater moving body using the upper opening surface.
Therefore, it can be easily installed in an existing hatching tank.

In the hatching induction apparatus A of the present invention, as shown in FIGS. 1 to 3, an underwater moving body 1 that moves at a substantially constant speed is disposed in an incubation tank B in which a large number of eggs C immediately after fertilization are stacked and stored. By moving the underwater moving body 1, all the eggs C in the hatching tank B are forcibly moved, and the relative positions of the eggs C are rearranged to form a new water supply channel W between them. is there.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, as shown in FIGS. 1 to 3, the underwater moving body 1 is a rotating shaft 1 a formed in a bar shape extending in the vertical direction, and the rotating shaft 1 a is inserted from the upper opening surface B 1 of the hatching tank B. , For example, shows a case in which the drive source 2 such as a motor is rotated in the horizontal direction including the horizontal direction.

  A plurality of blades 1b are protruded from the outer peripheral surface of the rotating shaft 1a at equal intervals in the circumferential direction, and through holes 1c larger than the outer diameter of the egg C are opened in these blades 1b. Even if the blade 1b rotated by 2 is in contact with the egg C, it passes through the through-hole 1c so that an unreasonable force does not act on the egg C.

Further, the driving speed of the driving source 2 is controlled so as to be adjustable by a controller (not shown), and is electrically connected to a timer (not shown) as necessary to drive only a preset date and time. You may do it.
When the drive source 2 is normally operated at the hatching stage, the rotation speed of the blade 1b is continuously operated at a low speed of, for example, about 5 cm / min. It has moved to keep the impact on the egg C to a minimum.

  In the illustrated example, as shown in FIG. 1, a plurality of rotating shafts 1a of the submerged moving body 1 are arranged in parallel with one inner side surface B2 of the upper opening surface B1 of the hatching tank B, and the blades 1b of the adjacent rotating shaft 1a are arranged. Are arranged close to each other so as to fit each other, and the rotating shaft 1a is supported so that adjacent blades 1b rotate in opposite directions, and reciprocates in parallel with the other inner side surface B3 of the upper opening surface B1. By moving, the inside of the hatching tank B is evenly stirred (stirred) to ensure that all the eggs C move.

  As an example of a mechanism that realizes such an operation, a traveling rail 4 is horizontally laid across a plurality of bases 3 arranged on both sides of the hatching tank B in the longitudinal direction, and a slider is moved along the traveling rail 4. 5 is reciprocally supported, and a plurality of rotary shafts 1a are arranged on the slider 5 in a direction orthogonal to the traveling rail 4, and the rotary shafts 1a are linked with transmission parts 6 such as gears, for example. The drive source 2 is driven by linking the component 6, the linear drive unit 7 such as a chain or a ball screw, which is horizontally mounted in parallel with the traveling rail 4, and the drive source 2, so that adjacent rotating shafts are driven. The blades 1b of 1a are reciprocated in the longitudinal direction of the hatching tank B while rotating in opposite directions.

  In addition, as shown in FIG. 2, the hatching tank B has water supplied from the water supply port B4 side on its inner bottom surface as disclosed in, for example, Utility Model Registration No. 2555122, Japanese Utility Model Publication No. 7-30048. A conventionally well-known structure in which a spring water flow is formed through the arranged egg receiving net B5, and used water is drained from the drain outlet B6 through a large number of eggs C accommodated on the egg receiving net B5. However, it is not necessary to arrange a lid-shaped hatching prevention net as disclosed in Utility Model Registration No. 2551242.

Next, the effect of the hatching induction apparatus A will be described.
First, the base 3 is attached to both sides in the longitudinal direction of the hatching tank B by fixing means 3a such as bolts, and the slider 5 is set so as to be able to reciprocate along the traveling rail 4 laid across the base 3. The installation of the hatching guidance apparatus A is completed.

  On the other hand, the eggs C immediately after fertilization are collected and stacked on the egg receiving net B5 in the hatching tank B and accommodated in large numbers (about 500,000 or more for hatching tanks of a size conventionally used), The water supplied through the egg receiving net B5 is cultivated before hatching by being drained from the drain B6 through the space between the seed eggs C. These eggs C have an integrated temperature immediately after fertilization. Since the probability that a malformed fry will hatch and the mortality during the fish farming period will decrease after 100 ° C. or more, it is preferable to start the hatching induction apparatus A from this time.

  Specifically, when the drive source 2 is driven, the rotating shaft 1a of the underwater moving body 1 reciprocates in the longitudinal direction of the hatching tank B while rotating the blades 1b in directions opposite to each other at a substantially constant speed, All the eggs C in the hatching tank B are stirred together with the water in the hatching tank B, and all the eggs C are forcibly moved by the water flow.

  Because of this movement, the relative positions of the eggs C are rearranged to form new water supply channels W between the various eggs C, and fresh water is supplied to the eggs C through the respective water supply channels W. The occurrence of oval softening due to oxygen deficiency can be suppressed.

  Moreover, since the water supply path W of fresh water is formed between the various eggs C by such movement of the underwater moving body 1, as disclosed in Utility Model Registration No. 2551242, It is not necessary to increase the amount of water supply and force the water to flow so that the upwelling water can pass between the eggs vigorously.

  As a result, since the amount of water supplied into the hatching tank B is at least good, the drainage can be performed even if the upper opening B1 of the hatching tank B is not closed by the egg-floating prevention net as disclosed in Japanese Utility Model Registration No. 2551242. The upper layer egg C near the mouth B6 is not floated and discharged together with the drainage, and the water supply amount is greatly reduced, so that it can be installed even in a place where it is difficult to secure water.

  At the same time, even if the aquatic fungus C1 propagates in a mold shape from a dead egg generated in the seed egg C to the good egg, the seed egg C is separated from each other by the movement of the underwater moving body 1 described above. The eggs are forcibly separated and the aquatic fungus C1 that has propagated in the mold shape is cut off, and the transfer of the aquatic fungus C1 is suppressed.

  According to the results of the experiment, in the conventional cultivation environment, the aquatic fungus C1 floating in the water adheres around the dead egg, grows in a mold shape, and the nearby good egg is hyphae of the aquatic fungus C1. Wrapped in a ball shape, the flow of water (oxygen) to the good eggs worsened and the number of dead eggs due to suffocation increased to the extent of softball, which sometimes resulted in complete annihilation, but disinfection with chemicals in the same environment Even without performing (medicine bath), the movement of the underwater moving body 1 described above confirmed that the hyphae of the aquatic fungus C1 encased in a ball shape was finely broken and the hyphae of the aquatic fungus C1 was inhibited from growing. did it.

  By the way, as a final work at the hatching stage, all artificial eggs C are shocked to perform artificial dredging work to obtain excellent fry. In this case, should the controller of the drive source 2 be operated? Alternatively, if the moving speed of the underwater moving body 1 described above is increased in accordance with a preset program, all the eggs C can be shocked, and the artificial dredging operation can be automated.

  Furthermore, in the case of the present embodiment, since the rotational speed of the blade 1b of the rotating shaft 1a by the driving source 2 is continuously operated at a low speed, the movement of the egg C becomes a slow and continuous continuous movement, which has an adverse effect on the egg C. Can be suppressed to the minimum level and the occurrence of malformations can be prevented.

  Moreover, since the rotating shaft 1a of the underwater moving body 1 is formed in a shape extending in the vertical direction and is inserted from the upper opening surface B1 of the hatching tank B and moved in the lateral direction, the upper surface of the hatching tank B is open. The underwater moving body 1 can be easily retrofitted using the upper opening surface B1.

  Further, if the fixing means 3a such as a bolt provided on the base 3 is removed, the hatching induction device A can be easily detached from the hatching tank B, so that it can be easily transferred to another hatching tank B. is there.

  In the previous embodiment, the rotary shaft 1a of the underwater moving body 1 is inserted from the upper opening surface B1 of the hatching tank B and rotated in the lateral direction, and an example of a mechanism for realizing the operation is shown in the drawings. It is not limited to this, the movement of the underwater moving body 1 is changed from rotation to linear reciprocating movement, the underwater moving body 1 is formed in a shape extending in the lateral direction, and rotated or reciprocated in the vertical direction including the vertical direction, etc. As long as all the eggs C in the hatching tank B can be forcibly moved by the movement of the underwater moving body 1, the arrangement direction and the operating direction of the underwater moving body 1 may be other than the illustrated example.

Further, in the illustrated example, the four blades 1b are protruded from the outer peripheral surface of the rotating shaft 1a of the submerged moving body 1. However, the present invention is not limited to this, and the inside of the hatching tank B is uniformly stirred to force all the eggs C. The shape and size of the blade 1b and the through hole 1c opened to the blade 1b may be other than those shown in the drawings.
Further, the mechanism for realizing the operation of the illustrated underwater moving body 1 is not limited, and any other structure may be used as long as the same operation as the above-described operation can be performed.

It is a partially notched top view of the hatching induction apparatus which shows one Example of this invention. It is the longitudinal section side view. It is a partial perspective view.

Explanation of symbols

A hatching induction device 1 underwater moving body 1a rotating shaft 1b blade 1c through-hole 2 drive source 3 base 3a fixing means 4 traveling rail 5 slider 6 transmission part 7 linear drive part B hatching tank B1 upper opening surface B2 one inner side surface B3 other side Inner side B4 Water supply port B5 Egg receiving net B6 Drainage port C Seed egg C1 Aquatic fungus W Water supply channel

Claims (3)

An underwater moving body (1) that moves at a substantially constant speed is disposed inside an incubation tank (B) in which a large number of eggs (C) are stacked and stored, and an incubation tank (1) is moved by the movement of the underwater moving body (1). B) The hatching induction apparatus characterized by forcibly moving all the eggs (C) in the inside, rearranging the relative positions of these eggs (C), and forming a water supply channel (W) between them. The hatching induction device according to claim 1, wherein the underwater moving body (1) is provided with a blade (1b) which is continuously rotated at a low speed. The hatching induction device according to claim 1 or 2, wherein the underwater moving body (1) is formed in a shape extending in the vertical direction, inserted from the upper opening surface (B1) of the hatching tank (B), and moved laterally.

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