JPS5995834A - Breeding of oyster - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for cultivating edible oysters in the sea.

[Technical background of the invention and its problems]

As is well known, oyster farming is carried out by attaching a large number of collectors with oyster seedlings attached to wires at appropriate intervals and suspending them from an aquaculture raft into the sea.

Oysters spawn in the summer (July to September). Farmers then fertilize the oysters that have spawned, pick them up between November and May of the following year, and ship them to markets and processing plants. The earlier (November to December) you can harvest and ship large quantities of oysters, the more advantageous you will be, but at this time of year,
The reality is that there are many oysters that are poorly fertilized, with eggs that are not fully fertilized, or that are not well-proportioned due to water power, X-O, etc., and as a result, the time when they can be shipped is delayed, and this is a major drawback to profitability. be.

[Purpose of the invention]

The present invention was made under these circumstances, and its purpose is to provide a method for cultivating oysters that can quickly produce oysters with good quality.

[Summary of the invention]

The present invention considers that it is appropriate to stimulate the physiological metabolism of the oyster itself in order to promote oyster fattening, and focuses on the fact that magnets have conventionally been used to promote the metabolism of the oyster's physiological body. A magnetic field is created in the seawater, and the magnetic force stimulates the oysters' physiology and increases their metabolism. This prevents the oysters from interlocking with the flow of seawater, making it easier for the oysters to feed, encouraging spawning, and improving fertilization and subsequent curing after spawning.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an oyster aquaculture facility. In the figure, 1 is a post-aquaculture facility floating on the sea surface. From this post-aquaculture facility, a large number of collectors 3 holding oysters 2 are placed in the seawater via wires 4. It is suspended.

As the collectors 3, for example, scallop shells are used, and the intervals between the collectors 3 are as shown in FIG.
It is maintained at about n.

Therefore, during the spawning season of oysters 2, a plurality of permanent magnets 6 as a magnetized system are attached to the wires 7 at regular intervals, and a series of oysters are suspended in seawater from 1 after cultivation. The lines of magnetic force of the magnet 6 are made to pass between each collector 3.

By doing this, the magnetic lines of force stimulate the oysters 2 to promote their metabolism, and the organic suspended matter such as plankton, which is food, is finely divided by the movement of the seawater in the magnetic shaft without agglomerating. Because it is separated and oyster 2 can easily feed,
Eggs are laid quickly and fertilization after spawning is good.

Generally, oysters spawn from July to September, so in August, oysters are cultured by hanging a magnet, and each of the oysters and oysters that were cultured at the same time without the use of a magnet are arbitrarily harvested. When the oysters from the tsf1 group were collected, 70% of them had laid eggs by the end of September, while only 30% of the oysters from the latter had laid eggs. It was clearly confirmed that the use of magnets was effective in promoting oyster spawning.

The early or late spawning of oysters has a large effect on the fertilization after spawning, which in turn leads to the quality of warehousing when shipped early. Therefore, in order to inspect the state of fertilization after spawning, oysters cultured using ab stones and oysters cultured without magnets were randomly sampled on the last day of each month of October, November, and December. We collected 10 pieces each, measured the total weight, weight of the shell, and weight of the flesh, and calculated the average value for each piece, and obtained the values shown in the table below.

Normally, the oyster's degree of infiltration is large before spawning, but after spawning, the amount of oyster's body becomes small, and then the oyster's degree recovers and its degree increases. The higher the degree of cracking, the better; in the industry, it is considered good if the degree of cracking is 45 degrees or higher. As is clear from the table above, oysters using magnets have recovered in Kurairi (Hitachi)
is better than oysters that do not use magnets, and therefore can be shipped earlier.

In the above embodiment, a magnet is suspended in parallel with the collector to form a porcelain ring around the collector, but the structure is not limited to this. For example, as shown in FIG. A tube 5 that maintains a constant mutual spacing between 3 and 3.
A permanent magnet 6 may be attached to the intermediate portion of the collector 3 as a magnetized member, and this magnet 6 may form a magnetic field around the collector 3. Furthermore, as means for constructing the magnetized member, in addition to using block-shaped magnets, magnetized metal powder solidified into a certain shape with a synthetic resin material, or a wire that suspends the collector may be used. The wire may be magnetized and the wire itself may also be used as a magnetized member.

〔Effect of the invention〕

As explained above, according to the present invention, the spawning of oysters is promoted by the simple means of forming a magnetic pot around the oyster collector by means of a magnetized part system, and the oysters can be stored quickly and easily. This has the effect of being able to obtain the following.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a perspective view of the support state of the collector in the same model 14 rero, and Fig. 3 is a perspective view showing another embodiment of the present invention. The strabismus shown is 1-1. 3...Collector, 6...Permanent magnet (magnetic part sinus).

Claims (1)

[Claims] A method for cultivating oysters, characterized in that a magnetic field is formed by a magnetized member around an oyster collector suspended in seawater, and oysters are spawned and subsequently cured within this magnetic field.