JPH0251574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a breeding tank, particularly a breeding tank for marine organisms that utilizes a tidal pool.

Natural coasts, especially rocky beaches and sandy beaches, are dotted with tidal pools, which are the living base and breeding grounds of many organisms, including useful aquatic organisms.
The existence of these "fields" has an impact on the biological communities far offshore, and therefore also contributes to the coastal fisheries that utilize some of these biological communities.

In other words, marine organisms such as algae proliferate in the tidal pools, and young fish and young fish grow by eating them, and in the offshore, large fish eat these young fish and young fish, which is a natural system. is formed.

An object of the present invention is to obtain a marine biological breeding tank in which a tidal pool formed on a sandy beach or a sandy beach is artificially created, thereby allowing marine life to grow.

In the marine biological breeding tank of the present invention, a reservoir having a depression having a height difference on the upper surface is provided at the back of the seawall of a sandy beach or a sandy beach in contact with the seawall, and the upper surface of the depression is lower than the sea level at high tide, It is characterized in that the level is higher than the sea level at low tide, and holes are provided in the seawall large enough to allow fish to enter and exit at this level.

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, a depression 4 is formed in the reclaimed area 3 adjacent to the seawall 2 in a stepwise manner from the upper surface thereof, and the seawall 2 is placed at the same level as the upper surface of the depression 4. A hole 5 is formed that is large enough for the fish to enter and exit, and a rock 6 is placed at the bottom of the depression 4 so that the top surface of the depression 4 is below the sea level at high tide and higher than the sea level at low tide, thereby promoting the proliferation of marine life. Configure the tank. Note that 1 indicates a mound established on a sandy beach or a sandy beach.

In another embodiment of the present invention, as shown in FIG. 2, the recess 4 is formed by, for example, a rectangular concrete block 7 having a plurality of recesses in the upper part, and the blocks 7 are placed adjacent to or apart from the sea wall 2. It should be placed on the seabed in front of the seawall.

In yet another embodiment of the present invention, as shown in FIG. 3, a concrete block 7 is placed on a sandy beach or a sandy beach, and a suitable epiphyte substrate is put into the depression 4 to create an artificial seaweed bed. Also, this case shows the case where the rock 6 is not thrown into the block 7.

Since the marine biological breeding tank of the present invention has the above-described structure, seawater always accumulates in the depression 4, that is, forms a tidal pool, and the following effects can be obtained.

(a) Shallow, well-lit, secluded tidal pools provide good habitat for many species of coastal anemones, small crustaceans, various snails, barnacles, oysters, mussels, and other aquatic organisms.

(b) The function of tidal pools produces aquatic organisms that serve as food for young and juvenile fish, and as a result, fish gather due to the food factor.

(c) Shallow tidal pools that are well exposed to sunlight are good habitats for seaweed and algae such as eelgrass and sargassum. The inside of the tidal pool is isolated from the sea during low tide, so it is not preyed on by large fish during that period.

(d) It is expected that the increased sessile organisms and algae in the tidal pool will absorb nutrients and remove organic suspended matter, maintaining good water quality.

(e) Since there are no competing species of the target algae and grasses in the artificial tide pool using Block 7, the creation of a seaweed bed can be expected. Also, if management is required, the work is easy because the water is shallow and the water is inside a concrete box.

(f) A plane with height differences that takes into consideration the vertically stratified distribution of periphyton and algae is formed by a stepped portion or a plurality of blocks 7, thereby ensuring a habitat for periphyton and algae. be done. or,
The rocks 6 in the artificial tide pool have the advantage of creating a space rich in variety.

[Brief explanation of drawings]

Figure 1 is a sectional view of the marine biological breeding tank of the present invention, Figure 2 is a sectional view of the marine biological breeding tank of the present invention;
3 are sectional views showing other embodiments of the present invention. 1... Mound, 2... Seawall, 3... Reclamation area, 4... Hole, 5... Hole, 6... Rock, 7...
...Concrete block.

Claims (1)

[Scope of Claims] 1. A reservoir having a depression with a height difference on the upper surface is provided at the back of the seawall of a sandy beach or sandy beach in contact with the seawall, and the upper surface of the depression is lower than the sea level at high tide and at low tide. A marine biological breeding tank characterized in that the level is higher than the sea level, and holes large enough to allow fish to enter and exit the seawall at this level are provided. 2. A large number of concrete blocks with depressions on the top surface are placed in front of the seawall of sandy beaches and sandy beaches.
A marine biological breeding tank characterized in that the upper surface of the depression is lower than the sea level at high tide and higher than the sea level at low tide.