JPH0147128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for floating a seaweed culture net.

Seaweed farming involves attaching seaweed spores to aquaculture nets.
The method of growing and harvesting seaweed in the sea or on the sea surface is practiced, but during the growth process of seaweed, it is necessary to remove seaweed, diatoms, and diseases that reduce quality and inhibit growth by lifting seaweed cultivation nets from the sea surface in a timely manner. The method used is to remove the substance by exposing it to the atmosphere.

Conventional seaweed cultivation methods are: in shallow seas, seaweed cultivation nets are strung on posts set on the seabed and are naturally exposed to the sea; in deep seas, seaweed cultivation nets are strung on tension ropes floating on the sea surface. Methods such as exposing the vessel to the sea using a flotation device fixed to it have been adopted. However, in the former case, the exposure time of the aquaculture net is limited by the tide, and in the latter case, the aquaculture net and flotation device are fixed, so during the seaweed harvesting season, the aquaculture net is removed from the flotation device. It is necessary to remove the cable, move it to the floating pick-up tension rope, and tension it, which requires a large amount of labor and time constraints. In order to expose the aquaculture nets to the sea again, they must either be transferred to the original flotation device or hauled up onto land, which increases the cost of nori production.

The present invention has been made for the purpose of solving the drawbacks of the conventional method described above.
A plurality of flotation devices that can float to the water surface, each consisting of a float attached to a frame around the bottom, are connected with a tow rope, passed under a seaweed culture net, and aquaculture is carried out on the device that floats without being fixed to the net. The idea is to lift the net out of the water and expose it to the atmosphere. The present invention will be explained in detail below with reference to the drawings.

The flotation device for exposing the seaweed culture net to the atmosphere used in the present invention is preferably a three-dimensional framework device that has a float attached to the bottom frame and can float to the water surface. The drying device (Japanese Patent Application No. 57-049651) is most suitable. That is, a plurality of rising frames are provided approximately perpendicularly to the rear end and middle part of the bottom peripheral frame having a rounded tip in the front, and the plurality of rising frames and the apex of the bottom peripheral frame are provided near the top of the bottom peripheral frame. A device is provided in which a plurality of connecting rods are provided in an inclined manner from the intermediate upright frame to the tip end, are installed from the intermediate upright frame to the rear end upright frame, and a float is attached to the bottom peripheral frame. The content shall be as follows. The framework constituting this device is preferably made entirely of synthetic resin or metal pipes, round bars, or a combination thereof. Although it depends on the size, usually a plurality of them are connected in series with a tow rope.

At a desired time, the flotation device 1 is installed by passing under the aquaculture net 4 stretched over a tension rope 3 floating on the sea surface by operating the tow rope 2. The flotation device 1 floats above the sea surface by the buoyancy of the float 5, and therefore the aquaculture net 4 is naturally lifted onto the plane formed by the rising frames 6, 6' of the flotation device 1. In the present invention, unlike conventional methods, the flotation device is not fixed to the aquaculture net, so it is very easy to expose the net to the atmosphere at the right time, and when the net is returned to the sea surface after the exposure, the tow rope is removed. The purpose can be achieved by simply pulling it out from under the net. Furthermore, after use, multiple flotation devices can be stacked together and compacted for storage. Furthermore, with the above-described configuration, the tip of the device scoops up the net by simply pulling the tow rope once, making it extremely easy to dry out the net. In addition, since it consists of a plurality of devices, by increasing or decreasing the number of devices, it is possible to dry out the seaweed buds according to their health and growth, and because they ride the waves well, healthy cultivation of seaweed can be achieved.

During the seaweed harvesting season, with the conventional method, the aquaculture net fixed to the flotation device must be removed and re-strung on the floating tension rope for harvesting before harvesting, which requires a great deal of labor, time and effort. Expenses are required;
In reality, this work is nearly impossible due to time constraints on the day of harvesting, but the flotation method of the present invention can avoid such work, and has the advantage of requiring only a small number of flotation devices, thereby eliminating regional restrictions. This is an epoch-making invention that allows seaweed to grow without being exposed to any damage.

Next, the present invention will be explained by examples.

A culture net with a width of approximately 2 m and a length of approximately 18 m was used, which was strung on a tension rope suspended on the sea surface. Five flotation devices 1 shown in FIGS. 1 and 2 were connected with tow ropes 2 and used. The size of the flotation device is as follows.

Length (tip to rear end) 254 cm Height: middle part 70 cm, rear end 90 cm Width: middle part 115 cm, rear end 175 cm One end of the tow rope is tied to the tension rope 3, and the other end is tied to the net 4
The flotation device was installed by passing under the net. The flotation device was floated by the action of the float 5, and the net was lifted onto the flotation device and easily exposed to the atmosphere. After several hours of exposure,
By untying the ties between the tow line and the tension line and pulling out the other end, the flotation device could be separated from the net and taken out of the tension line, and the net fell to the sea surface and the seaweed continued to grow. .

[Brief explanation of drawings]

Figure 1 is a plan view when the flotation device is pulled in and installed under the stretched aquaculture net, and Figure 2 is
FIG. 3 is a perspective view of a portion of the net when the net is lifted as the flotation device floats; 1... Levitation device, 2... Traction cable, 3... Tension cable, 4...
Aquaculture net, 5...Float.

Claims (1)

[Claims] 1. A seaweed cultivation net is constructed by connecting multiple flotation devices that can float to the water surface, which are three-dimensionally assembled from synthetic resin or metal pipes and/or round rods and with floats attached to the bottom peripheral frame, with a tow rope. 1. A method for flotation of a seaweed cultivation net, characterized in that the net is lifted from the water surface onto the floating device without being fixed to the net and exposed to the atmosphere.