JP2018042490A - Egg-laying bed for cyprinodont - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an egg-laying bed capable of preventing mold on cyprinodont eggs laid on the egg-laying bed.SOLUTION: An egg-laying bed for cyprinodont comprises nonwoven fabric including fibers containing silver or a silver compound. For example, the egg-laying bed 1 comprises multiple strips of nonwoven fabric 11 bundled at one end in a longitudinal direction so as to form a body 10, the bundled side being a base end part 12. A float 20 is mounted on the base end part 12 of the body 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spawning bed used for breeding medaka.

  As a spawning bed for breeding medaka, a variety of shapes made of aquatic plants such as water hyacinth, natural materials such as palm skin, and artificial materials such as synthetic resin fabrics and nets are used. (Patent Documents 1 and 2).

Utility Model Registration No. 3300370 Japanese Patent No. 5111318

  Medakas have the habit of laying eggs in aquatic plants, so that they are suitable for spawning beds in breeding in aquariums. However, growth management of aquatic plants is necessary, and if the growth state of aquatic plants deteriorates, it will not function as a spawning bed. Also, medaka eggs are prone to mold, and mold-grown eggs die without hatching. On the other hand, egg-laying beds made of palm skin or artificial materials do not require growth management, but they cannot prevent the occurrence of mold.

  In view of the background art described above, an object of the present invention is to provide a spawning bed for medaka that can suppress mold generation of laid eggs.

  That is, this invention has the structure as described in following [1]-[4].

  [1] A spawning bed for medaka, comprising a non-woven fabric containing fibers containing silver or a silver compound.

  [2] In the preceding item 1, a plurality of strip-shaped non-woven fabrics are bundled at one end in the longitudinal direction, a main body having a base end as a bundled side is formed, and a float is attached to the base end of the main body The spawning bed for medaka as described.

  [3] The spawning bed for medaka according to item 1 or 2, wherein the silver content in the nonwoven fabric is 50 ppm to 2500 ppm.

  [4] The spawning bed for medaka according to any one of the preceding items 1 to 3, wherein the hardness of the nonwoven fabric is 5 cm or less as a deflection amount measured by the method described below.

(Measurement method of deflection)
When a non-woven fabric having a strip shape with a width of 2.5 cm and a length of 25 cm is placed on a horizontal measurement table having a height sufficient for measurement so as to protrude 10 cm from the tip of the measurement table in the longitudinal direction. The difference between the height of the upper surface of the measuring table and the height of the lowermost end of the nonwoven fabric bent downward is measured, and this difference is taken as the amount of deflection.

  According to the spawning bed for medaka described in [1] above, the antibacterial action of silver contained in the non-woven fabric suppresses the occurrence of mold on the laid eggs, thereby increasing the hatching rate of the eggs. it can.

  The spawning bed for medaka described in the above [2] can float a strip-shaped main body near the water surface by floating, and has a shape suitable for the spawning habit of medaka. Further, if the float is lifted by lifting the egg-laying bed, the egg-laying bed can be moved without touching the main body and the egg, and the egg can be prevented from falling off during the movement.

  According to the spawning bed for medaka described in [3] above, a sufficient fungus suppressing effect can be obtained, and the material cost can be suppressed.

  The egg-laying bed for medaka described in [4] above is easy for medaka to lay eggs because the hardness of the nonwoven fabric is 5 cm or less.

It is a perspective view of the spawning bed for medaka of the present invention. It is a disassembled perspective view of the main body of the spawning bed for medaka of FIG. It is a front view which shows the state which floated the spawning bed for medaka of FIG. 1 in water.

  FIG. 1 shows an embodiment of a spawning bed for medaka of the present invention.

  The spawning bed for medaka 1 includes a main body 10 on which the medaka lays eggs and a float 20 for floating the main body 10 in a stable posture.

  The main body 10 is made of a non-woven fabric containing fibers containing silver or a silver compound (hereinafter referred to as silver-containing fibers) described later, and a plurality of strips 11 are bundled at one end in the longitudinal direction to form a base end portion 12. . As shown in FIG. 2, the main body 10 has a plurality of cuts 13 formed at predetermined intervals from one side of a rectangular nonwoven fabric toward the opposite side, and a plurality of strips 11 are connected by leaving a part of the opposite side. It can be produced by winding this part. The left uncut portion of the quadrangle becomes the base end portion 12 of the main body 10. Further, by forming the base end portion 12 by winding the cut nonwoven fabric tightly, the conical body 10 in which the tips of the strips 11 are radially spread out can be produced.

  In addition, even when strips having different lengths are mixed, a main body having a plurality of strips can be produced with one nonwoven fabric by the same method. For example, when a rectangular non-woven fabric having an inclined side into which the cut 13 is inserted is used, a plurality of strips having different lengths can be produced. The method for bundling the plurality of strips 11 is not limited to the above method.

  The float 20 is made of a foamed resin and has a disk shape having a hole 21 in the center.

  The spawning bed 1 for medaka is assembled by inserting the base end portion 12 of the main body 10 into the hole 21 of the float 20.

  As shown in FIG. 3, when the medaka egg-laying bed 1 is placed in a water tank, the strips 11 of the main body 10 float in a posture of spreading downward in the water with the float 20 facing up. The medaka egg-laying bed 1 receives sufficient buoyancy by the float 20, so that the main body 10 does not fall sideways and takes a stable floating posture. A stable levitation posture is a preferable condition for a spawning bed of a medaka, and the medaka lays an egg on the strip 11. Since the water in the vicinity of the main body 10 is sterilized by the antibacterial action of silver contained in the nonwoven fabric, generation of mold is suppressed in the laid eggs, and the hatching rate of the eggs can be increased. In addition, when the eggs laid on the egg-laying bed 1 are transferred to the hatching water tank, if the float 20 is picked and lifted, it can be moved without touching the main body 10 and the eggs. Dropping can be prevented.

  In addition, by changing the bulk specific gravity of the float 20, the float can be submerged in a posture in which the float is up and the main body is down. However, in order to raise the spawning bed without touching the water, at least a part of the float is It is preferable to come out of the water surface.

[Nonwoven fabric]
The nonwoven fabric is obtained by forming silver-containing fibers into a sheet shape. Nonwoven fabrics are easier to form than woven fabrics and knitted fabrics, and are suitable for spawning bed materials.

  The silver content in the nonwoven fabric is preferably 50 ppm to 2500 ppm. If it is less than 50 ppm, the effect of suppressing the generation of mold is small, and a sufficient effect is obtained at 50 ppm. Therefore, it is disadvantageous in terms of cost to contain a large amount of silver beyond that. By making the silver content not more than 2500 ppm, the material cost can be suppressed. The silver content is more preferably 100 ppm to 2000 ppm, particularly preferably 200 ppm to 1800 ppm.

  Although the method of containing silver or a silver compound in the fiber is not limited, a method of forming a fiber by kneading silver or a silver compound or zeolite supporting these in a material resin, a method of ion-bonding to a fiber as silver ions, A method of making silver contained in the fiber as ions hardly soluble in the fiber by a chemical reaction is preferable, and silver can be contained stably. Moreover, it is not necessary that all the fibers constituting the nonwoven fabric contain silver or a silver compound, and the nonwoven fabric is prepared by mixing silver-containing fibers and non-containing fibers so that the entire nonwoven fabric has a predetermined silver content. Can also be formed. Since silver-containing fibers are expensive to manufacture, it is advantageous in terms of cost to produce a nonwoven fabric by mixing silver-containing fibers and non-containing fibers. Moreover, if the silver containing fiber and the non-containing fiber are mixed uniformly, silver can be uniformly distributed within the nonwoven fabric.

  The fiber used as the base of the silver-containing fiber and the non-containing fiber type are not limited as long as they can be processed into a non-woven fabric, and examples include publicly used natural fibers, organic fibers, semi-synthetic fibers, synthetic fibers, and the like. Acrylic fiber, acrylic fiber, polyester, nylon, rayon, cotton, hemp, silk, wool and the like can be used as appropriate. Moreover, a nonwoven fabric can also be produced by mixing two or more kinds of fibers. For example, a nonwoven fabric can be produced by mixing silver-containing acrylic fibers and polyester fibers not containing silver.

  In addition, medaka lays eggs more easily if the nonwoven fabric is moderately firm and does not shake in water. For this reason, what the hardness of a nonwoven fabric is 5 cm or less as a deflection amount measured by the method shown below is preferable.

(Measurement method of deflection)
When a non-woven fabric having a strip shape with a width of 2.5 cm and a length of 25 cm is placed on a horizontal measurement table having a height sufficient for measurement so as to protrude 10 cm from the tip of the measurement table in the longitudinal direction. The difference between the height of the upper surface of the measuring table and the height of the lowermost end of the nonwoven fabric bent downward is measured, and this difference is taken as the amount of deflection.

  Moreover, what has thickness of 2 mm-10 mm is preferable rather than a thin nonwoven fabric. Further, the shape of the main body 10 in which a plurality of strips 11 are bundled is similar to the root of aquatic plants preferred by the medaka, and is adapted to the habit of the medaka. The width, length, and number of the strips 11 are not limited, but the width is preferably 5 to 15 mm, the length is 50 mm to 100 mm, and the number is preferably 5 to 15.

[float]
The shape and material of the float 20 are not limited. What is necessary is just to have the buoyancy which floats the main body 10 near the water surface, and besides a foamed resin mentioned above, a hollow body can also be used.

[Shaping bed shape]
The shape of the main body of the spawning bed is not limited to the strip shape, and a spawning bed of a block or ring shape is also included in the present invention. It is not limited to the fact that a float is attached to the main body. Further, instead of floating, a weight can be attached to the main body so as to be submerged in water or in the bottom of the water. It is not limited to the method of attaching the float and weight. For example, the main body may be wound around a float or weight.

  The egg-laying bed 1 having the shape shown in FIG. 1 was prepared using nonwoven fabrics having different silver contents. The egg-laying beds 1 of Examples 1 to 3 and the comparative example are common except for the silver content in the nonwoven fabric. The silver content can be determined by atomic absorption analysis.

  The material of the main body 10 is a non-woven fabric having a thickness of 5 mm in which silver-containing acrylic fibers (Nippon Exlan Industrial Co., Ltd., Silver World (registered trademark)) and polyester fibers not containing silver are mixed. The silver-containing acrylic fibers and the polyester fibers The silver content in the nonwoven fabric was adjusted by changing the mixing ratio. Table 1 shows the mixing ratio of the two types of fibers, the silver content in the nonwoven fabric, and the amount of deflection of the nonwoven fabric.

  As shown in FIG. 2, the nonwoven fabric forms ten strips 11 by making incisions 13 at intervals of 10 mm, and forms a base end portion 12 by winding an end portion without the incisions 13. did.

  The float 20 has a disk shape made of foamed resin and has a thickness of 17 mm and a diameter of 65 mm. A hole 21 having a diameter of 20 mm is provided at the center.

  The spawn bed 1 was assembled by inserting the base end 12 of the main body 10 into the hole 21 of the float 20. The length of the part which protrudes from the float 20 of the said strip 11 is 50 mm-100 mm.

[Oviposition test]
The spawning beds 1 of Examples 1 to 3 and the comparative example were floated in an outdoor water tank having a water volume of 10 liters. Five male and five female medaka fishes were placed in the water tank, and a spawning test of medaka fish was conducted. The water temperature during the test is 25 ° C to 35 ° C.

  In each case, medaka laid eggs on the strip 11 of the spawning bed 1 to 3 days after the start of breeding. The egg-laying bed 1 on which the eggs were laid was transferred to an indoor water tank without a parent medaka and hatched by performing environmental management at a water temperature of 24 ° C. The sample was transferred to an indoor water tank and observed for 7 days, and the occurrence of mold during that time was examined. In addition, the hatching rate was calculated from the number A of eggs laid and the number B hatched on the egg-laying bed 1 of Example 1 and the comparative example. The results are shown in Table 1.

  As shown in Table 1, it was confirmed that by adding silver to the nonwoven fabric, generation of mold was prevented and the hatching rate was increased.

  The egg-laying bed of the present invention can be used for breeding medaka.

DESCRIPTION OF SYMBOLS 1 ... Medaka egg-laying bed 10 ... Main body 11 ... Strip 12 ... Base end part 20 ... Floating

Claims (4)

  A spawning bed for medaka, comprising a non-woven fabric containing fibers containing silver or a silver compound.   The plurality of strip-shaped nonwoven fabrics are bundled at one end in a longitudinal direction, a main body having a base side as a bundled side is formed, and a float is attached to the base end of the main body. Spawning bed for medaka.   The egg-laying bed for medaka according to claim 1 or 2, wherein the non-woven fabric has a silver content of 50 ppm to 2500 ppm. The egg-laying bed for medaka according to any one of claims 1 to 3, wherein the hardness of the non-woven fabric is 5 cm or less as a deflection amount measured by a method shown below.
(Measurement method of deflection)
When a non-woven fabric having a strip shape with a width of 2.5 cm and a length of 25 cm is placed on a horizontal measurement table having a height sufficient for measurement so as to protrude 10 cm from the tip of the measurement table in the longitudinal direction. The difference between the height of the upper surface of the measuring table and the height of the lowermost end of the nonwoven fabric bent downward is measured, and this difference is taken as the amount of deflection.
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