JPH0659145B2 - Fry breeding facility - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention is intended to maintain a proper environment for the growth environment of bivalve molluscs such as clams and clams, that is, in the middle stage of the growing process. It is related to training facilities.

《Prior art》 As a method for artificially growing bivalves, in the past, mainly seedling-produced larvae were cultivated indoors to a shell length of about 2 mm. It was a method of releasing it to a breeding ground in the sea area and letting it grow under the natural conditions until it grows to an adult.

According to this method, since the shell length is released to the natural world with a small shell length, the growth of the shellfish is hindered by waves and sediment, the survival rate becomes 1% or less, and the production amount of adult shellfish could not be expected.

Therefore, a technique has been developed in which a part of the sea area is surrounded by a net, or a plurality of sand-covered beds laid in a trough-shaped plastic container hanging from the sea are lined up to carry out intermediate growth of juveniles.

<Problems to be solved by the invention> However, any of these technologies does not differ much from the natural conditions and is also affected by the waves, and there are adverse effects due to driftwood, algae, dust, etc. in the sea area, as well as tide difference. As a result, the sludge that entered the inside of the equipment or container accumulated on the sand and deteriorated the bottom sediment, which hindered the growth of the shellfish and made it unable to grow sufficiently.

It is an object of the present invention to provide a growing facility suitable for growing juveniles, which is less affected by waves and can quickly remove floating mud and the like to keep the bottom fresh.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention is constructed at a place where a tide difference occurs, and has a slab, and a skeleton having an outer wall of a height that sinks below the sea surface at high tide, A juvenile shell bed that is laid at the bottom of the body and has a high center and a slope so that the circumference is low, and a juvenile shell bed that consists of sand and the like, and around the juvenile shell bed inside the outer wall of the body. A drainage opening provided above the outer wall of the body and opening above the low water level outside the outer wall of the body and outside the outer wall of the body to open and close the drainage opening. It consists of an opening and closing gate,
Further, the opening / closing gate has a door member that slides and traverses the drainage opening up and down and has an opening that matches the drainage opening, and a float integrated with the door member, and changes in tide level. When the door member moves up and down through the float associated with the above, the position of the opening is moved up and down to open and close the drainage opening.

<Operation> The float rises as the tide rises from low tide to high tide, and the drainage opening closes at a certain tide.

When the tide level decreases from high tide to high tide, the float descends, releasing the drainage opening.

The drainage due to this release action is performed more rapidly than the ebb time, so the sludge accumulated on the juvenile bed is removed by this rapid flow.

<< Embodiment >> An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 is a concrete disk-shaped frame constructed on a ground E such as a sandy beach where a tide difference occurs.

The skeleton 1 includes a bottom plate 2 formed in a disk shape, an outer wall 3 that is integrally provided upright on the outer peripheral portion of the bottom plate 2, and gates 4 provided at four positions on the outer wall 3.

The height of the outer wall 3 is set lower than the height of the sea surface HWL at high tide, and the bottom of the opening 4a of the gate 4 is set at a height position corresponding to the sea surface LWL at low tide or a position slightly higher than this. Has been done.

Inside the body 1, on the bottom plate 2, a juvenile shell bed made of sand or the like laid so that the central top portion GL rises high and the periphery is laid with a low slope so as to match the bottom portion of the opening 4a. 5 are provided.

Drainage trenches 6 are concentrically and radially buried in the surface of the juvenile shell bed 5 and communicate with the opening 4a.

The particle size of the sand composing the juvenile shell bed 5 is selected to be suitable for the growth of juvenile shellfish, and juveniles grown indoors to some extent are bred in the juvenile shell bed 5.

On the gate 4, a door 8 integrated under the FRP float 7 is arranged so as to be able to move up and down, and the opening 4a is opened and closed according to the rising and lowering operation of the float 7 due to the tide difference. The float 7 and the door 8 form an open / close gate.

The detailed structure of the gate 4 is as shown in FIGS. 3 (a) and 3 (b), and the float 7 is housed in the recess 4b formed in the upper part of the gate 4 and integrated in the lower part thereof. The door 8 crosses the opening 4a and slides up and down.

The float 7 moves up and down according to the tide level, and when the float 7 descends at low tide, the opening 8a formed in the door 8 is opened by the opening 4a.
The opening 4a is opened in accordance with.

Further, when the door 8 is pulled up by the rise of the float 7, the opening 4a is closed.

The float 7 contacts the top plate 4c provided on the upper part of the recess 4b to keep the door closed, and the tide level inside the skeleton 1 fluctuates as shown by the chain line during the opening / closing operation during the ebb and flow cycle shown in FIG. .

A filter 9 composed of a plurality of ropes or the like is provided on the front surface of the opening 4a to prevent a suspended matter contained in seawater from entering the skeleton 1.

Further, a fish net (not shown) or the like is put on the upper surface opening of the structure body 1 to prevent excessive solar radiation and prevent foreign matter from entering the facility at the time of overflow.

In the above configuration, when the tide level LWL at low tide, as shown in FIG. 3 (a), seawater is taken in through the openings 4a and 8a, and the lower part of the juvenile bed 5 is immersed in seawater.
This prevents the juvenile shell bed 5 from drying up and excessively rising in temperature.

Next, when the tide level rises and the sea level rises to the position of the float 7, the float 7 rises and the door 8 also rises accordingly.

This ascending operation continues until the sea surface exceeds the top GL of the juvenile bed 5. Further, as the door 8 rises, the opening 8a and the opening 4a do not match as shown in FIG. 3 (b), and the opening 4a is closed. Further, the tide level when the door is closed is slightly lower than the top portion GL, and therefore, the top portion GL of the juvenile shell bed 5 is exposed for a period of time until the high tide.

When the tide level further rises from this state, the float 7 hits the top plate 4c and the like, and the further rise of the door 8 is restricted, and the door 8 is kept closed.

In the high tide state, seawater overflows the top end of the outer wall 3, invades the inside of the skeleton 1 to be filled, and then the skeleton 1 is completely submerged.

In the process from high tide to low tide, the opening 4a is closed until the sea level falls from the highest position of the float 7. Therefore, the inside of the body 1 is kept full of water,
A tide difference occurs between the inside of the body 1 and the surroundings.

And when the sea level drops to the highest position of float 7,
The float 7 begins to fall in response to the decrease in the tide level, and the door 8 also descends.

This operation starts at a position where the surrounding tide level is slightly higher than the top portion GL of the juvenile shell bed 5, and when it is considerably lower than the top portion GL, the opening 8a of the door 8 overlaps the opening 4a and the opening 4a is opened.

When the opening 4a is opened, the seawater inside the skeleton 1 is rapidly discharged according to the height difference, and due to this rapid discharging action, the sludge accumulated on the surface of the juvenile shell bed 5 is washed away and the top GL is removed. Exposed.

After that, the seawater inside the body 1 is gently discharged along the trench 6 according to the ebb tide, and the door 8 is opened / closed again in the cycle shown by the chain line in FIG. 4 according to the cycle of ebb and flow.

Therefore, the floating mud accumulated on the juvenile shell bed 5 is discharged by the rapid draining action of seawater at each time of the tidal cycle, thereby preventing the growth inhibition of the juvenile shell due to the floating mud.

In the above-mentioned breeding facilities, for example, in the case of clams, it is suitable as a sea intermediate breeding facility for growing 2-5 mm size juveniles grown on land to 5-10 mm size. It has been reported that the yield of shellfish released is 42% or more, and that of 10mm or more is 90% or more.

<Effects of the Invention> As described in detail with reference to the above examples, in the juvenile shellfish breeding facility according to the present invention, there is little influence of waves, etc. It is possible to provide suitable conditions for the growth of juveniles and is suitable as a facility for stably producing edible bivalves.

Further, according to the present invention, since the sludge in the facility is removed by utilizing the tide difference, the management is easy and the running cost is low.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing a fry shell growing facility according to the present invention, FIG. 2 is a plan view thereof, FIGS. 3 (a) and 3 (b) are detailed explanatory views of a gate portion, and FIG. It is a graph which shows the relationship between a cycle and the water level in a facility. 1 ... Disk-shaped skeleton, 2 ... Bottom plate 3 ... Outer wall, 4 ... Gate 4a ... Opening, 5 ... Jukai bed 7 ... Float, 8 ... Door 8a ... Opening

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 999999999 Komatsu Construction Co., Ltd. 3-5-4 Shiba Park, Minato-ku, Tokyo (71) Applicant 999999999 1-16 14 Shibuya, Shibuya-ku, Tokyo No. (71) Applicant 999999999 Toa Construction Industry Co., Ltd. 5 Yonbancho, Chiyoda-ku, Tokyo (71) Applicant 999999999 Japan Tetrapod Co., Ltd. 2-7-1 Nishishinjuku, Shinjuku-ku, Tokyo (71) Applicant 999999999 Mitsui Shipbuilding Co., Ltd. 5-6-4 Tsukiji, Chuo-ku, Tokyo (71) Applicant 999999999 Wakatsuki Construction Co., Ltd. 1-4-7 Hamacho, Wakamatsu-ku, Kitakyushu-shi, Fukuoka (71) Applicant 999999999 Bridgestone, Tokyo Central 1-10-1, Kyobashi, Ku (72) Inventor Seiichi Hosono 2-3, Kandajicho, Chiyoda-ku, Tokyo Obayashi Tokyo Book Co., Ltd. (72) Inventor Fumio Kaneko 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Yoshitaka Omori 1-1-7 Toyosu, Koto-ku, Tokyo Onoda Cement Co., Ltd. (72) Inventor Mitsuru Mimura 1-8-10 Azabudai, Minato-ku, Tokyo Komatsu Construction Co., Ltd. (72) Inventor Yukio Oami 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction Co., Ltd. (72) Inventor Hideo Ogino 5 Yonbancho, Chiyoda-ku, Tokyo Toa Construction Industry Co., Ltd. (72) Inventor Yuji Noguchi 2-7-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Tetrapod Co. 72) Inventor Shoji Tsumaya 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui & Co., Ltd. (72) Inventor Kunio Funada 2-23-18 Shimomeguro, Meguro-ku, Tokyo Wakatsuki Construction Co., Ltd. (72) Inventor Shinji Morimura Bridgestone Corporation, 1 Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa

Claims (1)

[Claims] 1. A skeleton having a bottom slab constructed at a place where a tide difference occurs and having an outer wall of a height that sinks below the sea level at high tide, and a skeleton laid at the bottom of the skeleton and having a high center and a surrounding area. Is provided with a gradient to be low, and a juvenile shell breeding bed made of sand and the like, and in the outer side of the body outer wall with an opening in the inner side of the outer body wall of the outer shell of the juvenile shell up to the upper part of the periphery The drain opening provided above the outer wall of the body, which opens above the low tide level, and the opening / closing gate provided outside the outer wall of the body to open / close the drain opening, and the opening / closing gate is A door member that vertically slides across a drainage opening, and has a door member having an opening that matches the drainage opening, and a float integrated with the door member, and the above The vertical movement of the member, spat nurturing facility, characterized in that for opening and closing the drainage opening up and down the position of the opening.