JP2017175993A - Feeding method of fish in land rearing water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding method capable of preventing collision death or rubbing of fish at a feeding time, in a land rearing device.SOLUTION: There is provided a method for feeding fish reared in a rearing water tank provided on the land. In the feeding method, feed is dropped uniformly onto the water surface of rearing water in the rearing water tank from above the rearing water tank. In a figure, a plurality of sieve machines 21 are arranged over the rearing water tank 1, and feed 10 is dropped from the sieve machines 21 uniformly onto the water surface in the rearing water tank 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for feeding fish in a land-reared aquarium.

  In the breeding of aquatic fish by terrestrial breeding, there are many cases where fish collide with the wall of the breeding tank and drown. In particular, there are many cases where fry and the like that cannot be controlled for swimming are drowned due to a collision or a broken bone. This is thought to be due to the startle or abnormal behavior of fish due to external stimuli such as sound and light. In particular, migratory fish such as bluefin tuna are sensitive to external stimuli. For this reason, various ingenuity has been made for breeding without giving unnecessary stress to fish in a land breeding facility.

  For example, in Patent Document 1, focusing on the fact that one of the causes of abnormal behavior such as cannibalism, startle behavior, collision death, etc. occurring in a tuna breeding tank is in visual stimulation, (a) a part of light is transmitted, And using a water tank in which a visual stimulus buffering material reflecting a part of light in an oblique direction is installed on the wall surface and bottom surface of the water tank, (b) placing colored fine particles in the breeding water of the water tank, and (c) the water tank Startling behavior of tuna by raising, storing or transporting tuna by controlling visual stimuli using at least one means of placing light reflectors on wall surface, bottom surface, IKES net surface or obstacle surface Or it describes preventing collision death.

  Patent Literature 2 focuses on the startle behavior of tuna and the cause of collision death in the light / dark cycle and illuminance. By keeping, storing or transporting tuna in an environment where the illuminance is kept at 150 lx or more, Preventing startle behavior or crash death is described.

Patent Document 3 discloses that the surface of a swimming tank in which tuna immature fish swim is maintained at an illuminance of at least 10 lx, and that the illuminance is within a range of 10 lx or more and less than 1000 lx. It is described that the swimming tank is installed so as not to be shaded based on it and the water surface of the swimming tank is kept at a substantially uniform illuminance so as not to give a sense of anxiety to the young fish of the tuna.
Similarly, in Patent Document 3, when feeding tuna immature fish, the tuna immature fish is grown early by increasing the intake of tuna immature fish by keeping the water surface of the swimming tank at an illuminance of at least 100 lx. In addition, it is described that they can survive over a long period of time.

Japanese Patent No. 4036381 Japanese Patent No. 4081092 Japanese Patent No. 5253314

However, conventionally, the effect of the feeding method on the survival rate of fish has not been studied. When feeding fish, the swimming speed is increased in order to feed the fish, but at that time, the fish swims at the rushing speed and collides with other fish, resulting in drowning as a result. Moreover, the cause of drowning is caused by threading as well as collision death.
An object of this invention is to provide the feeding method which prevents the collision death and thread of a fish at the time of feeding.

The present inventors have found that by using a sieving machine and a nozzle from above the breeding aquarium, it is possible to prevent the collision death and thread of the fish during feeding by allowing the food to fall evenly onto the water surface of the aquarium. The present invention has been completed.
That is, the present invention relates to a feeding method as described below.

(1) A method of feeding fish reared in a breeding tank on land,
A feeding method, wherein food is uniformly dropped from above the breeding tank onto the surface of the breeding water in the breeding tank.
(2) The feeding method according to (1) above, wherein a plurality of sieving machines are arranged above the breeding aquarium, and food is dropped from the sieving machine into the breeding aquarium.
(3) The feeding method as described in (2) above, wherein a plurality of the sieves are arranged above the breeding aquarium.
(4) Feeding method as described in said (3) characterized by dropping food into the breeding tank all at once from the plurality of sieves.
(5) The above-mentioned (1), wherein a feed dispersion liquid in which the feed is dispersed in water is discharged from the plurality of feeding nozzles arranged at intervals in the circumferential direction of the breeding aquarium. The feeding method described in 1.
(6) A swiveling feeding nozzle is provided above the center of the breeding aquarium, and a feed dispersion liquid in which the bait is dispersed in water is discharged from the swiveling feeding nozzle into the breeding aquarium. The feeding method according to (1) above.
(7) The feeding method according to any one of (1) to (6), wherein the breeding aquarium has a cylindrical shape, and a water flow that flows in a circumferential direction is formed in the cylindrical breeding aquarium. .
(8) The water flow is formed by arranging a water supply pipe on the inner wall side of the breeding water tank and discharging the breeding water from a discharge port of the water supply pipe in a direction along the tangential line of the inner wall surface. The feeding method according to (7).

  According to the feeding method of the present invention, it is possible to prevent collision death and threading of fish during feeding.

It is the schematic which looked at the example of the breeding apparatus which concerns on Embodiment 1 of this invention from the side surface. It is the schematic which looked at the breeding apparatus of FIG. 1 from the upper surface. It is the schematic which looked at the example of the breeding apparatus which concerns on Embodiment 2 of this invention from the side surface. It is the schematic which looked at the breeding apparatus of FIG. 3 from the upper surface. It is the schematic which looked at the example of the breeding apparatus which concerns on Embodiment 3 of this invention from the side. It is the schematic which looked at the breeding apparatus of FIG. 5 from the upper surface. It is a figure which shows the structural example of the water supply pipe | tube in embodiment of this invention.

  Conventionally, when feeding fish in land-fed aquariums, food is supplied into the aquarium by human hands or by automatic feeders, but at that time, it is often fed from a specific place (one place) . For this reason, the migratory situation of fish is disturbed and the collision often increases.

  Therefore, in the present invention, food is uniformly dropped on the water surface of the aquarium by using a sieve or a nozzle from above the breeding aquarium. Thus, by the feeding method in which the food is evenly dropped on the water surface of the breeding aquarium, it is possible to prevent the collision death of the fish and improve the survival rate.

Below, the example of the feeding method in the land raising apparatus which concerns on embodiment of this invention is demonstrated in detail using drawing.
In the drawings for explaining the following embodiments, the breeding aquarium has a cylindrical shape, and a water flow that flows in the circumferential direction is shown in the breeding aquarium, but the feed is evenly dropped on the water surface of the aquarium. If this is done, it is clear that it is possible to prevent the fish from crashing without forming a water flow with a cylindrical breeding tank.

(Embodiment 1)
FIG. 1 is a schematic view of an example of a fish terrestrial rearing apparatus according to Embodiment 1 of the present invention as viewed from the side, and FIG. 2 is a schematic view of the terrestrial rearing apparatus as viewed from above.
In the present embodiment, the sieving machine 21 is disposed above the breeding water tank. The sieving machine 21 is for dropping food on the water surface of the breeding aquarium, and is vibrated by a motor 22. In the case shown in FIG. 2, six sieves 21 are arranged so that food can be uniformly distributed on the water surface.

The sieve 21 may be preliminarily charged with food, and when the feeding time comes, the sieve 21 may be vibrated to drop the food. Further, when the feeding time is reached by providing a shutter on the bottom surface of the sieve 21, the shutter may be opened and the sieve 21 may be vibrated to drop the food.
Furthermore, when the feeding time is reached by providing a conveyor above the sieving machine 21, the bait may be conveyed to each sieving machine 21 to vibrate the sieving machine 21 to drop the food.
Moreover, it is preferable that food is dropped simultaneously from the plurality of sieves 21.

  Since the bait is dropped through the sieving machine 21, the dropped bait is spread evenly on the water surface. For this reason, the fish does not concentrate in one place for feeding, and it is possible to prevent the fish from colliding with each other and threading.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a schematic view of an example of an onshore farming apparatus for fish according to Embodiment 2 of the present invention as viewed from the side, and FIG. 4 is a schematic diagram of the onshore breeding apparatus as viewed from above.

  In the present embodiment, a plurality of feeding nozzles 26 are arranged at a predetermined interval in the circumferential direction above the breeding water tank 1, and a feeding water tank 23 is provided outside the breeding water tank 1. Then, a feed dispersion 28 in which the feed 10 is dispersed in the breeding water is accommodated in the feed water tank 23, and the feed dispersion 28 is supplied to the feed nozzle 26 through the pipe 25 by the pump 24. It is made to discharge to the breeding water tank 1.

The feed nozzle 26 is a fixed type, and the feed dispersion liquid 28 is discharged from the discharge port and sprayed on the water surface of the breeding aquarium 1. Since the feed dispersion liquid 28 is supplied in a state where the feed is dispersed in the breeding water, the fish can easily take the feed. Moreover, it is preferable to simultaneously discharge the feed dispersion liquid from the plurality of feed nozzles 26.
As the feeding nozzle 26, for example, a type having no clogging such as a pulverized coal supply nozzle for a blast furnace is used.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a schematic view of an example of a fish terrestrial rearing apparatus according to Embodiment 3 of the present invention as viewed from the side, and FIG. 6 is a schematic diagram of the terrestrial rearing apparatus as viewed from above.

  In the present embodiment, one feeding nozzle 27 is disposed above the center of the breeding aquarium 1, and a feeding water tank 23 is provided outside the breeding aquarium 1, and the feeding water 10 is fed into the feeding water tank 23. The feed dispersion liquid 28 is stored, and the feed dispersion liquid 28 is supplied to the feed nozzle 27 through the pipe 25.

The feeding nozzle 27 is of a swivel type, and while being swung, the feed dispersion liquid 28 is discharged from the discharge port and sprayed on the water surface of the breeding aquarium 1.
Moreover, it is preferable to increase the turning speed of the feed nozzle 27 to discharge the feed dispersion liquid 28.
In the present embodiment, as in the second embodiment, the feed dispersion liquid 28 is supplied in a state where the feed is dispersed in the breeding water, so that the fish can easily take the feed. Further, as the feeding nozzle 27, for example, a type having no clogging such as a pulverized coal supply nozzle for a blast furnace is used.

Moreover, in addition to spraying the food evenly on the water surface by the sieve machine and the feeding nozzle shown in the above embodiment, the breeding aquarium has a cylindrical shape, and a water flow flowing in the circumferential direction is formed in the cylindrical breeding aquarium. In this case, since the food floats on the water current, the fish does not fall to the bottom of the water in a short time, and the fish can sufficiently ingest the food.
The water flow is the inflow water that is newly taken and supplied to the breeding tank or the circulating water (hereinafter referred to as breeding water by combining the inflow water and the circulating water) from the outlet of the breeding water supply pipe to the inside of the breeding tank. It can be caused by discharging along the tangential direction of the wall surface, that is, along the inner wall surface.

Next, a method for forming a water flow in the breeding water tank when the breeding water tank is cylindrical will be described with reference to FIGS. 1 and 7.
The land breeding apparatus shown in FIGS. 1 and 2 includes a cylindrical breeding aquarium 1, a water supply pipe 2 for supplying breeding water to the breeding aquarium 1, and a drain port 4 for extracting the breeding water from the breeding aquarium 1. I have.

The breeding aquarium 1 is supplied with newly collected inflow water and purified circulating water through a water supply pipe 2. Hereinafter, the inflow water and the circulating water are collectively referred to as breeding water.
1 and 2, each of the four water supply pipes is arranged in the breeding aquarium 1 to inject breeding water into the breeding aquarium 1.

  The water supply pipe 2 is arranged in the vertical direction in the vicinity of the wall surface of the water tank 1 in parallel to the wall surface. The water supply pipe 2 is provided with a plurality of discharge ports 3 for discharging the breeding water. The number, the opening position, and the diameter of the discharge ports 3 in the water supply pipe 2 can be appropriately set by water flow analysis or the like. The total area of the number and the diameter of the discharge ports 3 is preferably equal to or greater than the pipe cross section.

FIG. 7 shows an example of the water supply pipe 2.
FIG. 7A shows an example in which the discharge ports 3 are provided uniformly in the length direction of the water supply pipe 2, and the discharge ports 3 are provided at equal distances between the lengths L <b> 1 of the water supply pipe 2. ing.
Moreover, what was shown in FIG.7 (b) provides many discharge ports 3 between the length L2 corresponding to the depth of the water tank which requires the strong water flow of the water supply pipe | tube 2. As shown in FIG.

In generating a water flow in the breeding aquarium 1, the breeding water is discharged from the discharge port 3 of the water supply pipe 2 along the tangential direction of the inner wall surface of the breeding tank, that is, along the inner wall surface.
Thereby, as shown by the arrow a in FIG. 2, a strong flow velocity (fast water flow) Fs is generated in the vicinity of the wall surface of the breeding water tank 1.
It is preferable that the installation angle can be freely adjusted at the base of the water supply pipe 2 for discharging the breeding water by providing a union or a flange.

When the water flow Fs is generated, a weak flow velocity (slow water flow) Fw is also generated in the center of the breeding water tank (see FIG. 2). In this way, a circumferential water flow occurs on the water surface and in the water. In FIG. 2, the size of the arrow indicating the water flow F indicates the speed of the water flow.
The direction of the water flow can be appropriately set according to the water flow analysis result or the like.

1 and 2, the water supply pipe 2 is installed in the vertical direction, but may be arranged at an angle with respect to the vertical direction. It is preferable to set an appropriate angle as appropriate by conducting water flow analysis.
In order to generate the water flow Fs, two or more water supply pipes 2 are provided in the water tank. In the case shown in FIG. 2, four water supply pipes are arranged at equal intervals along the inner peripheral surface. It is preferable to determine the number of water supply pipes according to the water flow analysis situation and to generate a uniform water flow.

It is preferable that the speed of the water flow can be changed according to the growth of the fish in the breeding aquarium 1. In order to change the speed of the water flow, it is only necessary to adjust the amount of water in each pipe by changing the pump flow rate or providing a valve in each pipe branched from the pipe that enters the breeding aquarium. The valve may be manual or an electric valve.
When a flow meter is provided, it is preferable that automation can be performed with a motor-operated valve.
In addition, it is preferable that the water flow can be strongly adjusted with a timer, an operation panel, or the like as necessary when the fish is excited, such as feeding, or the water quality deteriorates.

By using the breeding water for the generation of the water flow as described above, it is only necessary to extend the piping in the conventional equipment, and it is not necessary to increase the equipment other than the conventional system, which is advantageous in terms of cost.
In addition, it is advantageous in terms of water quality management because it is easy to collect the water flow so that the residual food collected at the bottom of the water tank gathers toward the drain outlet.

DESCRIPTION OF SYMBOLS 1 Breeding tank 2 Water supply pipe 3 Discharge port 4 Drainage port 10 Feed 21 Sieve machine 22 Motor 23 Feeding water tank 24 Pump 25 Piping 26, 27 Feeding nozzle 28 Feed dispersion Fs, Fw Water flow

Claims (8)

A method of feeding fish reared in a breeding tank on land,
A feeding method, wherein food is uniformly dropped from above the breeding tank onto the surface of the breeding water in the breeding tank.   The feeding method according to claim 1, wherein a plurality of sieving machines are disposed above the breeding aquarium, and food is dropped from the sieving machine into the breeding aquarium.   The feeding method according to claim 2, wherein a plurality of the sieves are arranged above the breeding aquarium.   The feeding method according to claim 3, wherein food is dropped from the plurality of sieving machines simultaneously into a breeding aquarium.   The feeding according to claim 1, wherein a feeding dispersion in which the food is dispersed in water is discharged from the plurality of feeding nozzles arranged at intervals in the circumferential direction of the breeding water tank. Method.   A swiveling feeding nozzle is provided above the center of the breeding aquarium, and a feed dispersion in which the bait is dispersed in water is discharged from the swiveling feeding nozzle into the breeding aquarium. The feeding method according to 1.   The feeding method according to any one of claims 1 to 6, wherein the breeding aquarium is cylindrical, and a water flow that flows in a circumferential direction is formed in the cylindrical breeding aquarium.   The water flow is formed by disposing a water supply pipe on the inner wall side of the breeding water tank and discharging the breeding water from a discharge port of the water supply pipe in a direction along the cut line of the inner wall surface. The feeding method described.