JP3684442B2 - Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a loggerhead seedling collecting device, a pearl oyster seedling production method, a pearl oyster culture rod, and a pearl oyster culture method.
[0002]
[Prior art]
In general, in the production of red scallop seedlings, the parental shellfish (adult) is induced to spawn by waiting for the germ cells to mature. The egg and sperm obtained by this method are fertilized. Since floating larvae with shells are reached approximately 24 hours after fertilization, breeding of floating larvae will be started. For culture, administer cultured phytoplankton. In 14-20 days, it grows to a shell length of 300 μm and becomes an attachment stage larva. Therefore, oyster shells are spread on the bottom of the aquarium, and a light-shielding curtain cut into a strip shape with a rod placed over the top of the aquarium is hung into the aquarium as a seedling device to attach larvae.
[0003]
Conventional seedling devices have a low seeding efficiency per tank because the number per seedling and the number of breeding water that can be accommodated in the breeding tank are limited. The rate of attachment to the seedling device per tank was about 15% with shading curtains and about 25% with oyster shells. In addition, the conventional seedling device has a problem in that it takes time and labor to shift to and manage intermediate growth at sea level.
[0004]
The red oysters are treated as seedlings for aquaculture or release since they have a shell length of about 3 cm and end their adherent life and shift to benthic life.
[0005]
There is a simple method of aquaculture, such as carp culture. In aquaculture pods, unlike the sand, the red oysters roll inside without being stable, and the shell of shells on the surface of the shells, which is a characteristic of the red oysters, is peeled off. The appearance of Japanese mussels and mussels, as well as the deterioration of the color of the body, are seen, resulting in low commercial value.
[0006]
In addition, as a submerged drooping method, a method (sand floor drooping method) has been developed in which sand is placed in tarai and seedlings are accommodated in order to create the same state as the seabed. With this sand-flooding method, sufficient load-bearing capacity cannot be obtained from the structure and materials of talai and containers, so there are limits to the number of stages, which places a heavy burden on the work surface and intensively aquaculture management with a small fishing area It ’s difficult.
[0007]
In all parts of the country, the mainstream is a method of aquaculture in which seedlings are placed in rebar rods and submerged. Reinforcing rods are heavy, so production efficiency per unit area is poor, and because the weight is large, facilities such as ships are large. In recent years, a large amount of death has occurred due to the deterioration of sediment, which is a major problem.
[0008]
In the production of red scallops, it is necessary to improve the efficiency of seed production and simplification of intermediate breeding in the sea during the seedling process. Improvement of quality is demanded, and it is desired to develop a device suitable for reducing the labor of a series of processes from seed production to aquaculture, intensive production, work efficiency, intermediate breeding and aquaculture.
[0009]
[Problems to be solved by the invention]
Therefore, the present invention provides a scallop seedling seedling device, a scallop seedling seedling that can increase the production efficiency of akagai, which is not inferior to conventional technology, has a high commercial value, can be intensively managed and labor-saving, and can improve production efficiency. An object is to provide a production method, a loggerhead culture rod and a loggerhead culture method.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned purpose, it is important to reduce the weight, ease of management in the aquarium, and improve the adhesion rate of the conventional seed-collecting device, which is important in the production of artificial seedlings but has been complicated. Focusing on this point, the material and structure were improved.
In addition, in the conventional aquaculture method, since only the sea bottom of the fishing ground is used, the production amount per unit area is limited. Therefore, in order to solve this problem, the weight of the aquaculture container is reduced, and each container creates a situation similar to the seabed, enabling multi-stage drooping vertically from the sea surface, improving productivity and ease of management. It was improved and developed so that the produced red oysters had the same quality as those caught from the seabed.
[0011]
The scallop seedling collecting device according to the present invention has a plurality of tape bundles formed by turning back a plurality of water-resistant tapes having a specific gravity equal to or less than the specific gravity of seawater and arranged in parallel at intervals, and connects the intermediate portions of the tape bundles. It is characterized in that it is connected with a material and a weight is fixed to one end of the connecting material.
[0012]
In the present invention, it is preferable that the seedling device is lightweight, robust, clean, high-density accommodation and easy to handle, and the water-resistant tape is preferably made of a plastic tape. The connecting material is preferably made of a chemical fiber yarn.
The scallop seedling collecting device according to the present invention stands up in water with a weight attached to the bottom when submerged in seawater. For this reason, since it is not necessary to suspend, it can be freely thrown into the water tank and the facility material cost can be reduced. The tape bundle has a large surface area compared to the case where the tape bundle is not formed into a bundle, and it is difficult to hinder water circulation in the water tank, and efficient seedling can be performed with a plurality of tape bundles.
[0013]
The scallop seedling seedling device according to the present invention is lighter and softer than the conventional seedling device using shells, so it is used with the larvae attached even when shifting to intermediate breeding at sea level. be able to. According to the scallop seedling harvesting device according to the present invention, the growth of akagai is not inferior to that of the prior art, the product value is high, more intensive management and labor saving are possible, the survival rate is improved, and the production efficiency is improved. Can be achieved.
[0014]
The method for producing a scallop seedling according to the present invention is characterized in that the seedling device according to the present invention is placed in seawater in which the scallop larvae float and the scallop is seeded with the seedling device.
[0015]
The scallop-cultured cocoon according to the present invention is characterized in that the inner bottom portion and the inner side portion of the cocoon are covered with a raised material having a hair foot of 2 cm to 5 cm. The length of the bristle is particularly preferably about 3 cm. The raised material is provided such that the hair feet extend toward the inside of the heel.
Since the inner bottom part and the inner side part of the cocoon are covered with the raised material of a predetermined length, the housed seedling can entangle the foot thread and support the body in the scallop-cultured cocoon according to the present invention. Moreover, the same situation as the sea bottom can be formed at the inner bottom of the coral.
[0016]
The scallop cultured culm according to the present invention can be cultivated in an intensive manner by being connected in multiple stages. According to the scallop cultured culm according to the present invention, the growth of the scallop is not inferior to that of the prior art, and the product value is high, more intensive management and labor saving can be achieved, and the production efficiency can be improved.
[0017]
The loggerhead culture method according to the present invention is characterized by cultivating a pearl oyster larvae in the oyster cultivating rod according to the present invention.
In particular, the loggerhead culture method according to the present invention is characterized in that the seedling device according to the present invention is placed in seawater where the oyster larvae float and the scallop is seeded with the seedling device and then attached to the seedling device. It is preferable to cultivate the scallop larvae that have been prepared by placing them in the scallop culture culm according to the present invention.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention.
As shown in FIG. 1 (B), for the preparation of the scallop seedling seedling device 1, 43 g of sago as a weight 3 was bound to one end of a chemical fiber yarn 2 for repairing a fishing net that had been cut to a length of about 100 cm in advance. A plurality of water-resistant plastic tapes 4 having a width of about 1 cm and having a length of 100 cm are prepared. The water resistant plastic tape 4 is made of a nylon tape having a specific gravity equal to or lower than that of seawater and water. As shown in FIG. 1 (A), the tape 4 is folded back a plurality of times with a length of 10 cm to form a tape bundle 5. At this time, the tape 4 is twisted, and the tape 4 is bundled while making a ring. A plurality, for example ten, of such tape bundles 5 are made.
[0019]
Ten prepared tape bundles 5 are passed through the previously prepared thread 2 and are spaced apart at equal intervals. The yarn 2 serves as a connecting material for the tape bundle 5. The ends of the thread 2 are tied so that the tape bundle 5 does not come off. The oyster seedling seedling device 1 thus created arranges a plurality of tape bundles 5 at intervals in parallel, connects intermediate portions of each tape bundle 5 with a connecting material, and fixes a weight 3 to one end of the connecting material. It is made up. The scallop seedling harvester 1 has a structure that does not hinder the circulation of seawater while maintaining a large surface area.
[0020]
In this method for producing a scallop seedling using the seedling device 1, the seedling device 1 is placed in the seawater in which the oyster larvae float, and the seedling device 1 is used to harvest the red oyster. When the seedling device 1 is put into the aquarium, the weight 3 side is attached to the bottom, and the seedling device 1 rises vertically from the bottom of the aquarium in the shape of a seaweed by its own buoyancy. Since the seedling device 1 does not need to be hung, it can be freely put into the water tank. In addition, since the seedling device 1 uses the plastic tape 4 in a bundle, the surface area is large, and the water circulation in the water tank is significantly improved as compared with the conventional method. Thereby, efficient seedling is possible in all layers from the bottom layer to the upper layer of the seedling device 1.
[0021]
Since the seedling device 1 is lighter and softer than conventional seedling devices such as shells, it can be used with the juveniles attached even when shifting to intermediate growth on the sea surface. As a result, the weight of the cultured trough is reduced, and the intermediate breeding facility is not required to be strong, leading to a reduction in facility material costs. In addition, the seedling device 1 also sufficiently plays a role as a sticking substrate for juvenile shellfish in an intermediate breeding pot, has good water passage, and can improve growth and survival rate.
[0022]
As shown in FIG. 2, the inner shell 12 and the inner side 13 of the cocoon-cultured cocoon 10 are covered with a raised material 11 having a hair foot of about 3 cm. This cultured trough 10 uses the sea surface vertically, cultivates a large amount of red oysters in a space-saving manner, and obtains the same quality as those caught from natural fishing grounds.
[0023]
The oyster cultivated salmon 10 can be manufactured by improving the existing cultivated salmon 10. The ready-made aquaculture rod 10 is formed by covering the bottom portion 12, the side portion 13, and the upper portion of two round rings with a net 14. The typical aquaculture rod 10 is a standard double circle, has two suspensions 15 and 15, and has a bottom diameter of 46 cm. The red scallop cultured cocoon 10 was prepared by sewing a 3 cm-long raised hair carpet on the entire bottom net of the existing cultivated cocoon 10 so that the carpet stood about 3-5 cm on the side of the cocoon. The carpet is attached such that the hairs extend to the inside of the culture rod 10. This scallop-cultured cocoon 10 has a structure for receiving juveniles by covering the bottom surface of the cocoon and the side surface of the ridge about 3 cm from the bottom surface with the raised material 11. As the carpet on the bottom surface, a hairy foot having a length of about 3 cm was used as the length of the hairy foot that can accommodate the seedlings that are entangled with the foot thread and support the body. The raised material 11 may be a mat material in addition to a carpet.
[0024]
In the akagai culture method using the akagai culture pod 10, the oyster shells are placed in the oyster culture cultivar 10 and cultured. In the oyster culture method, the seedling device 1 described above is placed in the seawater where the oyster larvae float and the scallop is collected using the seedling device 1, and then the oyster shells attached to the seedling device 1 are used as the oyster shell. It is preferable to cultivate in the inside of 10.
[0025]
As a result of this cultivation, floating mud naturally deposits on the bottom of the coral, creating a situation similar to that of the seabed, producing shellfish surface and body color, etc. It became possible. The akagai dive into the raised foot of the raised material 11 to support the body. When bred alone, many oysters and other oysters adhered to the shell of the red oyster, causing the growth of the red oyster to stagnate. On the other hand, in the red oyster culture pod 10, the bottom is covered with floating mud, so that there are almost no attached organisms in the shell, and the red oyster can grow smoothly. According to the oyster cultivated cocoon 10, the pearl oyster larvae can live in the cultivated cocoon 10 without sand while maintaining a natural posture.
[0026]
Looking at the growth and survival rate of red oysters using this improved red oyster culture paddy 10, the shell length that can be shipped as a product has reached a size of 7 cm or more in about 2 years from seedling, and this growth is compared with the sand bed hanging method However, the survival rate improved to 90%.
[0027]
Due to its structure, the aquaculture rod 10 can be connected in multiple stages, and the facilities are lightweight. By using this aquaculture rod 10, aquaculture can be conducted intensively, and a limited aquaculture ground can be vertically connected. It has become possible to cultivate red oysters on a practical scale, improving the profitability more intensively than conventional methods, up to the size that can be used for shipping products. The cultured trough 10 can withstand the weight after the accumulation of floating mud, and when it is lifted to the sea surface, the floating mud can be easily dropped out from the mesh.
[0028]
At present, loggerhead aquaculture has become established in some areas in Miyagi Prefecture, leading to an increase in fishermen's income. In the future, this aquaculture is in the direction of further development and is being established as a new aquaculture industry that has never existed before. In addition to this aquaculture, the prefecture is also actively engaged in oyster fishing boat fishing, but in recent years there has been concern about the depletion of resources and the need for breeding by seedling release has been screamed. By using the above-mentioned loggerhead seedling harvester 1, akagai seedling production method, akagai cultivating rod 10 and akagai culturing method, efficient production of larger seedlings with higher survival rate after release as well as expansion of akagai culture area Is also possible. Furthermore, there is a possibility that the large-scale mortality problem, the three-dimensional utilization of the sea surface, and the lightening of the facilities in the seabed subsidence type loggerhead culture currently being conducted mainly in western Japan may be solved by using this culture method. This technology is expected to spread nationwide.
[0029]
【The invention's effect】
According to the present invention, the growth of the red oyster is not inferior to that of the prior art, has a high commercial value, can be more intensively managed and labor-saving, and can improve the production efficiency. A production method, a loggerhead culture rod and a loggerhead culture method can be provided.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing a method for producing a tape bundle (A) and (B) a front view of a scallop seedling collecting device according to the present invention.
FIG. 2 is a perspective view of a scallop cultured culm according to the present invention.
[0028]
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scallop seedling collecting device 2 Chemical fiber yarn 3 Weight 4 Plastic tape 5 Tape bundle 10 Red scallop cultured ridge 11 Brushed material 12 Inner bottom 13 Inner side 14 Net 15 Lifting hand

Claims (5)

A plurality of tape bundles formed by bending a plurality of water-resistant tapes whose specific gravity is equal to or less than the specific gravity of seawater are arranged in parallel at intervals, and the middle part of each tape bundle is connected with a connecting material, and a weight is attached to one end of the connecting material. A seedling collector for red scallop seedlings, characterized by being fixed. 2. A method for producing a red oyster seedling, wherein the seedling device according to claim 1 is placed in seawater in which red oyster larvae float and the red oyster is collected with the seedling device. An oyster culture cultivated rice cake, wherein the inner bottom portion and the inner side portion of the cocoon are covered with a brushed material having a hair foot of 2 cm to 5 cm. 4. A method for cultivating a pearl oyster comprising cultivating a pearl oyster shellfish in the oyster culture cultivating rod according to claim 3. The scallop larvae attached to the seedling device after the seedling device according to claim 1 is placed in seawater in which flounder larvae float and the scallop is collected with the seedling device. A akagai culture method characterized in that it is cultivated by placing it in a cocoon.

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