JP2008206496A - Method for producing suspended row for culturing shellfishes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a suspended row, by which shellfishes can be cultured efficiently, in a method for culturing the shellfishes in a suspended style. <P>SOLUTION: This method for producing the suspended row including fixing spats to the suspended row with an adhesive, in a method for culturing the shellfishes in a suspended style, has the step of adjusting spat-adhering positions by means of wave form or V-shaped pedestals. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a drooping chain used when culturing shellfish in a drooping manner.

  As a method of culturing shellfish, a hanging type is generally used in which shellfish are attached to a base material such as a wire or a rope and cultured in the sea. Shells can be attached by attaching a basket to a wire or rope and placing an appropriate amount of juvenile shellfish in it (cargo culture), or making a hole directly in the shell and fixing it with a vinyl string or a binding band. And a method of cultivating juveniles collected as scallops as a seedling device (hanging naked) are known.

  However, when a cage is used, it is necessary to secure the distance between the ropes depending on the size of the cage, and the amount of culture is sometimes limited. The method of fixing with a vinyl string, a binding band or the like may not be usable depending on the type of shellfish, and requires a great deal of labor for the shell removal process after cultivation. Moreover, when it cultures using a seedling device as it is, when the shellfish are densely adhered, growth is suppressed, and the size may not be sufficient as a product, or the shape may be distorted.

In order to improve these, the method of adhering shellfish to a base material using an adhesive agent and cultivating it has been proposed (Patent Document 1, Patent Document 2). However, since these all use organic adhesives, their durability is not sufficient. Moreover, there is a concern about the influence of the organic adhesive on the environment.
Japanese Utility Model Publication No. 53-106499 JP-A-55-165735

  Accordingly, an object of the present invention is to provide a method for producing a drooping chain for efficiently cultivating shellfish in a method of culturing shellfish in a hanging manner.

  As a result of various studies in view of such circumstances, the present inventors have made a drooping series manufactured by adjusting the bonding position of the juvenile using a corrugated or V-shaped pedestal when the juvenile is fixed to the drooping series with an adhesive. As a result, it was found that shellfish can be efficiently cultivated, and the present invention was completed.

  That is, the present invention is a method of manufacturing a drooping series in which shellfish are cultivated in a drooping manner by fixing the juvenile shells to the drooping series with an adhesive, and the bonding position of the juvenile shellfish is determined by corrugated or V-shaped pedestals. The present invention provides a method for manufacturing a drooping series characterized by adjusting.

  According to this invention, when fixing shellfish to a rope, a base material can be easily located in the center of the shellfish to fix irrespective of the shape of a shellfish. In addition, since the number and interval of shells to be fixed can be easily adjusted according to the type and size of shellfish, shells of sufficient size and good shape can be cultivated efficiently, improving productivity. This makes it possible to cultivate products with high added value. In addition, if an inorganic hydraulic composition is used as the adhesive, peeling work after the cultivation is easy, and the adjustment of the shipping amount is also easy.

Examples of shellfish cultivated by the method of the present invention include oysters and scallops, and are particularly suitable for oyster culture.
As the shellfish, shellfish collected by a seedling device can be used by a normal method. The size of the young shellfish is preferably 1.5 to 10 cm, particularly 3 to 8 cm.

The pedestal used in the present invention is corrugated or V-shaped, the peak height is 15 to 100 mm, particularly 30 to 80 mm; the pitch is 50 to 200 mm, particularly 60 to 150 mm; the number of peaks is 1 to 50, especially What is 5-30 is preferable. The material of the pedestal is not particularly limited, and for example, a resin such as polycarbonate or vinyl chloride, a steel material, or the like can be used.
By using such a pedestal, the bonding position of the juvenile shellfish can be easily adjusted.

  Examples of the base material of the drooping line include a wire and a rope. Moreover, it is preferable that the length of a base material is 2-8 m, especially 2-6 m.

In the present invention, first, juveniles are arranged on a pedestal. The interval between the larvae is preferably 5 to 15 cm, particularly 7 to 12 cm.
Next, a base material such as a wire or a rope is stretched so as to come into contact with the juvenile shell while being pulled, and both ends are fixed. And using an adhesive agent, a young shellfish is fixed to a base material. At this time, the number of juvenile shells per point is preferably 1 to 6, particularly 2 to 4 in order to obtain a shell having a sufficient size and a good shape. Moreover, it is preferable that the number of juveniles attached per droop is 60 to 150, particularly 80 to 120.

  As the adhesive, a slurry of a hydraulic composition mainly composed of cement is preferable. The cement used in the hydraulic composition may be any cement as long as it is stipulated in JIS. Portland cements, blast furnace cement, fly ash cement, slag cement, eco cement, alumina cement, etc. It is possible to use a seed or a mixture of two or more kinds in an appropriate ratio. From the viewpoint of workability and strength development, it is particularly preferable to use early-strength Portland cement. These cements can be used alone, but can also be used by mixing admixtures such as gypsum, limestone fine powder, silica fume, and calcium aluminate as necessary.

  In the hydraulic composition, carbonates, sulfates, nitrites, nitrates, chlorides, hydroxides, and the like of alkali metals and alkaline earth metals are further added to the slurry as materials for adjusting the curability. It can also be added within a range that does not affect. These materials may be mixed with cement or a powder obtained by mixing cement and an admixture in advance, or may be added by dissolving in water at the time of kneading.

Such a hydraulic composition is used as a slurry. Specifically, the hydraulic composition and water as described above can be used by kneading at a ratio of 25 to 50 parts by mass of water with respect to 100 parts by mass of the hydraulic composition.
The adhesive is preferably used in an amount of 5 to 40 g per shell to bond the juvenile shell to the base material. When a plurality of larvae are bonded to one point of the base material, several larvae are arranged in advance on the base so that the positions of the bonded larvae are evenly centered on the base material. Apply an appropriate amount of adhesive according to the number and shape.

  After bonding, the adhesive is sufficiently cured, and shellfish may be cultivated by a normal method as a drooping chain.

  Hereinafter, the present invention will be described in detail by way of examples.

Example 1
(1) Installation of pedestal:
Pedestals A to C were prepared using commercially available polycarbonate corrugated sheets so as to satisfy the conditions shown in Table 1. Moreover, the base D which does not use a corrugated sheet as a comparison was also produced.

(2) Manufacture of drooping series:
A drooping chain that satisfies the conditions shown in Table 2 was manufactured. That is, juvenile oysters are arranged on the pedestal so as to have a predetermined number and interval, and the nylon rope is stretched so as to be in contact with the juvenile while pulling so that there is no slack, and both ends are fixed. Here, about 80 g of an adhesive material kneaded with early-strength Portland cement (manufactured by Taiheiyo Cement) and tap water was placed, and a juvenile shellfish was further adhered thereon. The adhesive was sufficiently cured by allowing it to stand for 1 day as it was, and a drooping ream for cultivation was obtained.

(3) Drooping state:
After leaving still for one day, the number of larvae peeled off when removing the drooping run from the pedestal and the ratio of the peeled larvae to the number of adhered larvae (hereinafter, peel rate) were determined. In addition, the state of adhesion between the juvenile shellfish and the rope was visually observed and evaluated according to the following criteria. The results are shown in Table 3.
A: The rope is located almost at the center of the bonding site, and the juveniles are evenly bonded.
○: There is a bias in the bonding area of the rope, but there is no particular problem with the bonding of juvenile shellfish.
(Triangle | delta): The situation where a rope is distorted in the adhesion | attachment site | part and there is variation in the direction of the adhering shellfish.
X: A situation in which the rope is detached from the bonding site and a lot of juvenile shells are peeled off.

  From the results in Table 3, according to the method of the present invention, the number of juvenile shells that can be bonded per drooping chain can be greatly increased, the number of juvenile shells to be peeled off after bonding is small, and the bonding position of the juvenile shells is also good. It was confirmed that a drooping series for aquaculture could be manufactured.

Claims (6)

  A method for cultivating shellfish in a drooping manner, and a method for producing a drooping series in which a juvenile is fixed to a drooping series with an adhesive, characterized in that the bonding position of the juvenile shellfish is adjusted by a corrugated or V-shaped base. A manufacturing method of the drooping series.   The method for producing a drooping ream according to claim 1, wherein the shellfish is an oyster.   The method for producing a drooping chain according to claim 1 or 2, wherein the adhesive is made of a slurry of a hydraulic composition mainly composed of cement.   The length of the base material used for a drooping series is 2-8 m, The manufacturing method of the dripping series of any one of Claims 1-3.   The manufacturing method of the drooping series according to any one of claims 1 to 4, wherein the number of shellfish attached per drooping series is 60 to 150.   The method for producing a drooping series according to any one of claims 1 to 5, wherein an interval when the shellfish is attached to the drooping series is 5 to 15 cm.