JP2000232834A - Apparatus for raising plankton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means capable of well and simply cleaning seawater, etc., and in its turn efficiently raising planktons without damaging larvae even by circulating and cleaning the seawater, etc. SOLUTION: This apparatus is obtained by using an apparatus prepared by installing many water flow holes 3 on the wall surface of a raising tank 1 for planktons and filling a water-permeable gel 4 in the water flow holes 3 as the apparatus for raising the planktons. In this case, the surface of the water-permeable gel 4 is covered with a water-permeable film or sheet 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for breeding floating organisms, and more particularly to an apparatus for breeding organisms floating in seawater such as larvae such as jellyfish, squid and sea urchin.

[0002]

2. Description of the Related Art Larvae such as jellyfish and squid have extremely low resistance and are very likely to die even with a slight change in environment. For example, if seawater or water (hereinafter simply referred to as seawater) becomes contaminated with food residue or excrement (feces),
Easily killed.

For this reason, purification of seawater or the like has been conventionally performed. At the time of this purification, the larvae as floating organisms are extremely small (usually about 0.1 to 0.3 mm), so that they are easily discharged together with seawater from between the eyes of the filtration unit. For this reason, if the size of the filtration unit is reduced, not only is it difficult to purify and drain water for a long time, but also the floating organisms have extremely low resistance, so they are damaged by the net of the filtration unit etc. at the time of purification, leading to death .

[0004] In other words, seawater purification is indispensable, and when performing this, if a net with small eyes is used to prevent the discharge of larvae, the larvae will be damaged and die more than the nets. Due to difficulties, this measure is currently of great importance.

[0005]

The problem to be solved by the present invention is to solve the above-mentioned drawbacks of the conventional method. More specifically, even if the seawater is circulated and purified, the larva is not damaged. In addition, it is an object of the present invention to develop a means which can purify the creatures effectively and easily, and thereby efficiently breed the floating organisms.

[0006]

The object of the present invention is to provide a large number of water holes on the wall of a floating creature breeding tank, and to fill the water holes with a water-permeable gel. The problem is solved by coating a conductive film or sheet.

That is, a large number of water holes are provided on the wall of the breeding tank,
Fill the water-permeable hole with a water-permeable gel, and on top of that,
It is preferable to coat a water-permeable film. Filling the water holes with a water-permeable gel prevents the release of larvae of floating organisms and purifies dirty seawater. In addition, since the gel has elasticity, the larvae of the floating organisms are extremely unlikely to be damaged, so that it is possible to breed healthy larvae in clean seawater.

[0008] More preferably, by providing a water-permeable film on the surface of the water passage hole, the biodegradation or outflow of the gel can be prevented, and the contamination of seawater due to the biodegradation or outflow of the gel can be effectively prevented. In addition, the environment such as seawater can be further cleaned, and the breeding effect can be further improved.

[0009]

FIG. 1 shows an example of the breeding apparatus of the present invention, wherein 1 is a breeding tank of the present invention, 2 is a larva of a floating organism, 3 is a water hole, and 4 is filled therein. A water-permeable gel 5 is a water-permeable film coated on the surface of the water passage hole 3.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, there is a case where it is used alone, and as shown in FIG.

When used alone, the water passage 3 filled with the water-permeable gel 4 of the breeding tub 1 is appropriately sealed (sealing means is not shown), and the water passage 3 is used for purification. Open up
What is necessary is just to replace the water inside the breeding tub 1 with the external water. In some cases, the breeding tub 1 of the present invention may be
It may be installed in a river or the like. At this time, of course, the water passage hole 3 filled with the water-permeable gel 4 is opened.

As shown in FIG. 2, the outer tank 6 may be used together. In this case, the outer tank 6 is provided with a filtration unit 7, and the pump 8 is used to circulate seawater in the outer tank 6.

That is, the breeding tub 1 of the present invention is installed in the outer tub 6, and the water hole 3 filled with the water-permeable gel 4 is originally opened. As a result, the seawater in the breeding tub 1 is transferred to the seawater in the outer tub 6 through the water holes 3, purified by the filtration unit 7, and circulated again in the breeding tub 1.

The breeding tank 1 is usually made of synthetic resin or glass, preferably made of transparent synthetic resin or glass. Preferred synthetic resins are, for example, acrylic resins, polyolefins such as polycarbonate, polypropylene and polyethylene, and ordinary glass is used. The size is not particularly limited, and is appropriately determined. The shape is not limited, and various shapes are freely and appropriately selected in a wide range. For example, if a representative shape is illustrated, a spherical shape, a conical shape, a pyramid shape, etc. other than a cylindrical shape, a square tube shape, etc. can be illustrated. In this case, the cylindrical shape includes an elliptical shape,
In addition, the prismatic shape includes a triangle, a quadrangle, an octagon, a decagon, and the like. Usually a cylindrical shape is the most preferred shape.

A water hole 3 provided in the breeding tub 1 is for discharging seawater inside the breeding tub 1, and the seawater is exchanged through the water permeable hole 3. Accordingly, the number and size of the water holes 3 are not particularly limited, and it is essential that the water holes and the like can be efficiently replaced in the breeding tub 1. For example, when the breeding tank 1 is cylindrical and has a diameter of 50 cm and a height of 100 cm, the size of the water passage hole is about 5 to 20 mm in diameter, and it is preferable to provide about 50 to 100 holes. .

The water-permeable gel 4 filled in the water holes 3 effectively removes only the remaining ammonium or the like in which the remaining food and excrement contained in the seawater in the breeding tank 1 are dissolved. That is, a gel having a property of being permeable and allowing water to pass therethrough but not allowing larvae of floating organisms to be used is used. More preferably, a hardly decomposable water-permeable gel which is hardly dissolved or decomposed in water is used. Specific examples include agarose, mannan, alginate, curdlan, and the like. These gels usually fill the water holes 3 without gaps.

A film 5 covering the surface of the water-permeable gel 4
As such, a water-permeable crosslinked polyvinyl alcohol or the like is preferable. The water-permeable gel 4 and the water-permeable film 5 are preferably transparent when hydrated to avoid irritation to floating organisms.

In the present invention, as shown in FIG. 2, it is preferable to further use an outer tub 6. In this case, the outer tub 6 is larger than the breeding tub 1, and the material of the outer tub 6 is used. Etc. may be made of synthetic resin or glass. The outer tank 6 is provided with a filtering section 7, and the seawater in the outer tank 6 is filtered by the filtering section 7 via the pump 8 and circulated in the breeding tank 1. At this time, the dissolved ammonia and the like in which the feed and excrement are dissolved are filtered by the filtration unit 7, but the larva hardly migrates to the outer tank 6.

The floating organisms bred in the present invention are usually those that float and fluff during larvae, and are specifically larvae such as jellyfish, squid, sea urchin, abalone and shrimp.

When breeding these larvae using the breeding apparatus of the present invention, the breeding tank 1 of the present invention is first filled with a water-permeable gel 4 and a water-permeable film 5 is provided on the surface thereof.
When used alone as shown in FIG.
And then add the required amount of seawater. Then, the larvae are put in the larvae, and bred while feeding them according to a conventional method. Then, in order to prevent the seawater from being contaminated by the remaining food and excrement, the water passage 3 is appropriately opened and the water is purified through the water passage 3. At this time, the larvae of the floating organisms can be kept bred in the breeding layer 1.

In the present invention, as shown in FIG.
When the breeding tub 1 of the present invention is used in combination with a larger outer tub 6, the water permeable holes 3 filled with the water-permeable gel 4 are used while being opened.

[0022]

The present invention will be described in more detail with reference to the following examples.

[0023]

EXAMPLE 1 An outer tank 6 shown in FIG. 2 was used, and an apparatus having a double structure in which a rearing tank 1 of the present invention was provided at the center was used. The outer tub 6 is made of an acrylic resin having a thickness of 10 mm, the size is 200 × 200 × 100 cm, and the breeding tub 1 is made of an acrylic resin having a diameter of 80 mm made of an acrylic resin having a thickness of 10 mm.
m, 90 cm in height. This breeding tank 1
Has a uniform water hole 3 having a diameter of 10 mm on its surface.
Provided. The water holes 3 were filled with agarose as a water-permeable gel 4, and seawater was actually added to breed moon jellyfish larvae for one month.

At this time, the number of surviving moon jellyfish one month later was 82% (100 survived, 82 survived). At this time, among the water holes 3 provided in the breeding tub 1, the amount of gel in the water holes 3 was reduced in thirteen, and the larva passed through the water holes.

[0025]

Example 2 Mannan was used as the water-permeable gel 4 in place of the agarose in Example 1 described above, and all other operations were the same as in Example 1. As a result, the number of surviving moon jellyfish was 78.

[0026]

Comparative Example 1 The procedure of Example 1 was repeated except that the gel 4 in Example 1 was not used at all. in this case,
The number of surviving jellyfish was 21 and the jellyfish flowed out from the water hole 3 and was often caught in the pump 8 and died.

[0027]

Example 3 A crosslinked polyvinyl alcohol film 5 (thickness: 20 μm) was further provided on both sides so as to cover the surface of the water-permeable gel 4 in Example 1 described above, and all other operations were the same as in Example 1. As a result, the survival number of the jellyfish increased to 90, and the jellyfish did not pass through the water hole 3 at all.

[0028]

Comparative Example 2 The same operation as in Example 1 was carried out except that agarose in Example 1 was replaced with a water-impermeable oily gel. The number of surviving jellyfish at this time is 12
The seawater in the rearing tank 1 was contaminated.

In each of the above examples, the jellyfish jellyfish was a larva having an umbrella diameter of about 2 mm.

[0030]

Example 4 When squid larvae were used in place of the jellyfish in Example 3, the number of surviving animals was 89.

[0031]

By using the apparatus of the present invention, purification of seawater can be achieved without replacing seawater at all and effectively preventing the death of floating organisms.
It is very easy and reliable to successfully breed floating organisms, especially their larvae, which has been previously impossible. Therefore, the effect in industry is extremely large.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the breeding apparatus of the present invention.

FIG. 2 is an explanatory view showing another example of the breeding apparatus of the present invention.

[Explanation of symbols]

 1. Breeding tank of the present invention 2. larvae of floating organisms Water hole 4. 4. water-permeable gel 5. Water-permeable film or sheet Outer tank 7. Filtration unit 8. pump

Claims (4)

[Claims] 1. A floating organism breeding apparatus characterized in that a large number of water holes are provided on the wall surface of a floating organism rearing tank, and the water holes are filled with a water-permeable gel. 2. The floating organism breeding apparatus according to claim 1, wherein the surface of the water-permeable gel is covered with a water-permeable film or sheet. 3. The method of claim 2, wherein the water-permeable gel is agarose, mannan,
The floating organism breeding apparatus according to claim 1, wherein the apparatus is at least one of alginate and curdlan. 4. An apparatus for breeding floating organisms, wherein the tank for breeding floating organisms according to claim 1 is used as an inner tank, and the tank is installed in an outer tank which is a separately provided water tank.