JPS63141523A - Eelgrass field creation method - 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 (Industrial Application Field) The present invention relates to an eelgrass bed creation method for artificially creating an eelgrass bed.

(Conventional technology) Seaweed beds in shallow waters, especially eelgrass beds, are marine resources II! It has been revealed by many biology and fisheries researchers that it is a place where

Furthermore, the eelgrass field has an ffl environment purification function due to the carbon dioxide assimilation effect of the eelgrass and the action of the root threads.

In recent years, Japan's coastal fishing industry for medium- to high-grade fish has been in decline because eelgrass beds have disappeared due to land reclamation and water/sediment pollution, resulting in the loss of habitat for fish (especially young fish). This is said to be one of the reasons. For this reason, attempts have already been made by local governments, electric power companies, etc. to artificially create eelgrass beds.

Conventional methods for creating eelgrass beds include the following:

(b) Germinated seeds of eelgrass are placed in a double moji net and the net is placed in the sea.

(b) A double net containing germinated eelgrass seeds is fixed to a concrete frame and placed in the sea.

(c) Sow eelgrass seeds directly on the sandy bottom surrounded by moji netting.

(d) Seeds of eelgrass seeds are sown in paper pots in an aquarium, and after growing, the pots are placed in the sea.

(e) Spread sand on the seabed and sow eelgrass seeds on top of it.

(f) Transplant the eelgrass collected by Gatsuto boat onto the sand bed on the seabed.

(G) Seeds of eelgrass are sown in muddy soil in an aquarium, grown in co-current flow of seawater, and then transplanted into the sea.

(Problems to be Solved by the Invention) These construction methods have a problem in that the survival rate after transplanting to the seabed is low. This is considered to be due to the following reasons.

(a) The density of eelgrass is too low.

(b) Underground rhizomes become unstable due to biological activities, waves, etc.

(C) Predation damage by fish and benthic organisms.

(d) The bottom sediment at the transplant site is unsuitable for eelgrass growth.

An object of the present invention is to provide a method for creating an eelgrass bed that has a high survival rate after transplanting into the sea or the seabed, has a high growth density and is highly resistant to feeding damage, and can form a stable eelgrass bed at an early stage. It is in.

(Means for Solving the Problems) A method for creating an eelgrass bed according to the present invention to achieve the above object is to sow eelgrass seeds on a rock wool mat, and place the seeds on the rock wool mat in an aquarium. The method is characterized in that the eelgrass seedlings are germinated and raised, and the grown eelgrass seedlings are transplanted into the sea or on the seabed together with the rock wool mat.

(Function) As described above, the rock wool mat used as a substrate for sowing eelgrass in the present invention has (1) shape and strength:! One node is free, and the porosity is large, making it suitable for root system development.
(Since J has a large specific gravity and sinks in water, it is easy to install it in an aquarium or on the seabed. (4) Because it is made from natural rocks, it will be reduced to soil after a certain period of time. ■ It cannot be rolled or bent. It is possible to transport the seedlings after raising them and to install them on the seabed.

In addition, when seeds are sown on the rock wool mat and raised in an aquarium, (1) high-density habitat is possible, and c2) water temperature
It is now possible to control sunlight and nutrients to create R-suitable growth conditions, making it easier to manage fertilization, etc. (4)
) Growth can be controlled to suit the size and timing of transplantation.

Furthermore, when eelgrass seedlings are transplanted together with rock wool mats into the sea or on the seabed, (1) the rock wool mats serve as a substrate for eelgrass growth, so they can be transplanted regardless of the soil type or chemical conditions of the sea bed, and (C) the rock wool mats Its flexibility allows it to adapt to the undulations of the seabed, and since eelgrass seedlings grown at high density on rock wool mats are transplanted directly into the sea or onto the seabed, a high-density eelgrass bed is immediately formed and is highly resistant to feeding damage. (a) The root system of eelgrass is protected from fish etc. because it is inside the rock wool mat.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 5.

In this LIii example, as shown in Fig. 1, eelgrass is grown on a rock wool mat 1, placed in an aquarium 2 on land, and seawater is circulated or flushed with a pump 3 to germinate and germinate. Manage seedling raising.

Next, the eelgrass seedlings 4 grown as shown in FIG. 2 (A>(B)) are transplanted together with the rock wool mat 1 onto the seabed 5. It can correspond to the undulations of the seabed 5.The rock wool mat 1 is fixed to the seabed 5 by placing concrete blocks 6 intermittently on it to prevent it from being washed away.

FIGS. 3(A) and 3(B) show other examples of the state in which the rock wool mat 1 on which the eelgrass seedlings 4 have been grown is transplanted to the seabed 5. In this embodiment, a rock wool mat 1 is fixed with a bar-shaped concrete block 6.

FIGS. 4(A) and 4(B) show still another example of transplanting the rock wool mat 1 on which the eelgrass seedlings 4 were grown to the seabed. In Figure 4 (A>), a rock wool mat 1 on which eelgrass seedlings 4 have been grown is transplanted onto a caisson 7 installed on the seabed 5. In Figure 4 (8), a bail 8 is driven into the seabed 5, and the A rock wool mat 1 on which eelgrass seedlings 4 were grown was transplanted onto an artificial seabed 9 provided above.

FIG. 5 (A>(B) shows an example in which the rock wool mat 1 on which eelgrass seedlings 4 have been grown is transplanted into the sea. In FIG. 5 (A), the floating structure 10 is connected via the wire 11 and anchor the floating structure 1 to the seabed 5 with an anchor 12.
Rock wool mat 1 on which eelgrass seedlings 4 were grown was transplanted onto 0. Figure 5 (B) shows structure 13 as buoy 1.
4, float it in the sea and connect it to the anchor 12 via the wire 11.
Tethered to the seabed with
This figure shows an example of transplanting Rockwool Mat 1 on which .

When the height of the rock wool mat 1 from the seabed 5 is changed as shown in Figs. 4 and 5, eelgrass carries out photosynthesis,
They can easily obtain the depth of water they need to survive. In addition, there are 7 caissons, 9 artificial seabeds, 10 floating structures, and 1 structure.
The third prize is also a fishing reef.

(Effects of 'R Light) In the eelgrass field creation method according to the present invention, rock wool mats are particularly used as the eelgrass seeding substrate (base for sowing seeds), so the following effects can be obtained.

(a) Shape and strength can be adjusted freely.

(b) It has a large porosity and is suitable for root system development.

(0) Because it has a high specific gravity and sinks in water, it is easy to install it in an aquarium or on the seabed.

(d) Since it is produced from natural products, it is returned to the soil after a certain period of time and does not cause environmental destruction.

<e> Since it can be rolled up or bent, it is easy to transport the seedlings after raising them and to place them on the seabed.

Further, in the present invention, since seedlings are raised in an aquarium on land, the following effects can be obtained.

(f) High-density habitat becomes possible.

(9) It is possible to achieve optimal growth conditions by controlling water temperature, sunlight, and trophic differences.

(h) It is easy to manage fertilizer application, etc.

(1) Growth can be controlled to suit the size and timing of transplantation.

Furthermore, in the present invention, the grown eelgrass seedlings are transplanted into the seabed or the sea with the rock wool mat, so the following effects can be obtained.

<j) The rock wool mat can be used as a growth substrate for eelgrass, regardless of the soil type or chemical conditions of the ocean floor.

(k) Because rock wool mats are flexible, they can be transplanted to accommodate the undulations of the seabed.

(1) Since eelgrass grown at high density on rock wool mats is placed directly on the seabed, a high-density eelgrass bed can be formed immediately and is highly resistant to feeding damage.

(i) The root system of eelgrass is protected from fish etc. because it is inside the rock wool mat.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of the state in which eelgrass seedlings are grown according to the present invention, and Fig. 2 (A) and (B) are examples of the state in which a rock wool mat on which eelgrass seedlings are grown according to the present invention is transplanted to the seabed. 3(A) and 3(B) are a plan view and a longitudinal sectional view showing another example of a rock wool mat on which eelgrass seedlings have been grown in a state of being transplanted to the seabed, and FIG. 4(A) )(B
) is a vertical cross-sectional view showing two other examples of rock wool mats on which eelgrass seedlings have been grown and transplanted to the seabed, and Figure 5 (A
) (B) is a vertical cross-sectional view showing two examples of rock wool mats on which eelgrass seedlings have been grown in a state of being transplanted into the sea. 1...Rock wool mat, 2...Aquarium, 4...
Eelgrass seedlings, 5... on the ocean floor. Patent applicant: Pentayo Construction Co., Ltd. Agent
Patent attorney Isao Sasaki −
°゛：)□? Figure 4 (A) Figure 5 (A) Figure 4 (E3) Figure 5 CB)

Claims (1)

[Claims] Seeds of eelgrass are sown on a rock wool mat, germination and seedlings of the eel grass are raised on the rock wool mat in an aquarium, and the grown eel grass seedlings are transplanted into the sea or on the seabed together with the rock wool mat. A distinctive eelgrass field creation method.