JPH05306511A - Tiered construction work with fish bank and fish path - Google Patents

Abstract

PURPOSE:To obtain a fish path allowing fish to escape from fish banks when the water flow in waterway is greatly reduced when constructing a tiered part with fish banks wherein dust and drifting logs are hard to deposit. CONSTITUTION:A fish bank block 1 consists of a bottom slab 2, vertical walls 3 extending toward bilateral directions on the back edge of the slab 2, a receiving wall 5 extending toward bilateral directions on the front edge of the slab 2, an escape path 6 partly formed in the wall 5, and a support wall 4 frontwards projecting from the upper end of the walls 3. The blocks 1 are set by turning the rear side of the walls 3 upwards to form a slower stage, and the next blocks 1 are set on the blocks 1 of the lower stage by turning the rear parts of the walls 3 upwards to form an upper stage to construct a tiered construction work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canopy for a waterway such as a river or an artificial canal, and a fishway, and more particularly to a canopy with a fish nest and a fishway suitable for aquatic organisms such as fish, shellfish and crabs. Is.

[0002]

2. Description of the Related Art As a conventional head drop with fish nest, as described in Japanese Utility Model Laid-Open No. 3-79325, a flat rectangular base portion, a rear vertical wall erected at its rear edge portion, and a front edge portion are provided. A fish nest block consisting of an upright front vertical wall and a horizontal wall connected to the upper end of the rear vertical wall is used, and the fish nest blocks are buried in the riverbed and lined up in the transverse direction of the waterway. There is known a head drop forming method in which a lower stage is formed, an upper stage is formed at a position spaced from the lower stage upstream from the lower stage in the same manner as the lower stage, and fish nests are formed in these fish nest blocks.

[0003]

However, in the above head drop construction, there was no escape route for fish or the like anywhere in the fish nest block, so when the water flow rate of the river decreased significantly, There was a problem of being trapped in a nest. Further, there is a possibility that driftwood, dust, or the like may be caught and accumulated on the front vertical wall standing upright on the front edge of the substrate portion.

[0004] Therefore, an object of the present invention is to provide a novel head drop structure with a fish nest in which fish or the like can escape from the fish nest and the driftwood or dust is unlikely to be accumulated when the water flow rate in the water channel is significantly reduced. To provide. Further, another object of the present invention is to provide a novel fishway with a fish nest that can easily raise the fish even when such a drop construction is provided and protect the fish in the rise from the birds. To do.

[0005]

In order to achieve the above-mentioned object, a head drop with fish nest of the present invention comprises a bottom plate, a vertical wall extending in the left-right direction upright at the rear edge of the bottom plate, and A fish nest block having a support wall protruding forward from the upper end of the vertical wall is used, and the fish nest blocks are arranged in a row in the transverse direction of the water channel so that the rear surface of the vertical wall faces the upstream side. The lower stage was formed, and the upper stage was formed by arranging the next fish nest block above the lower stage fish nest block so that the rear surface of the vertical wall faces the upstream side (claim 1).

[0006] Another head drop with fish nest of the present invention is a bottom plate, a vertical wall extending in the left-right direction, which is erected on a rear edge of the bottom plate, and a support erected on an intermediate part of the bottom plate. A fish nest block provided with a wall was used, and the construction was performed in the same manner as the above-mentioned drop structure with a fish nest (claim 2).

In the above means, the terms "upper stage" and "lower stage" mean a relatively upper stage and a lower stage, of course, not limited to two stages, and three or more stages depending on the drop. It is possible to build a head drop.

Next, the fishway with a fish nest of the present invention is particularly preferably provided in combination with the present invention or a conventional drop structure, and the bottom plate and the left-right direction erected at the rear edge of the bottom plate. Using a fish nest block having a vertical wall extending in a vertical direction, a support wall protruding forward from the upper end of the vertical wall, and a receiving wall extending in the left-right direction upright on the front edge of the bottom plate. The fish nest blocks are arranged in a row in the longitudinal direction of the water channel so that their side faces face each other (claim 3). In this fish path with a fish nest, it is preferable that the receiving walls of adjacent fish nest blocks are alternately positioned on opposite sides (claim 4).

[0009]

According to the drop structure with the fish nest according to the first or second aspect, the bottom plate of the upper fish nest block can be placed and supported on the upper surfaces of the vertical wall and the support wall of the lower fish nest block.
However, it is not essential to place the fish nest blocks in this way, and the fish nest blocks in the upper and lower stages may be placed, for example, on a concrete base cast on site. Then, only by changing the relative positions of the upper and lower fish nest blocks, it is possible to adapt to the drop work with different slopes.

Further, a fish nest close to nature suitable for habitat of aquatic organisms such as fish, shellfish and crab is formed over a wide area for the following reasons. First, a fish nest is formed on the upper surface of the bottom plate for each fish nest block in each stage. Since the top surface of this bottom plate is horizontal, gravel, cobblestone or cobblestone (in order of increasing size)
Any of these can be laid singly or in a uniform height or in an uneven shape. In the sense of changing the fish nest, it is preferable to lay it in a concavo-convex shape by combining gravel, cobblestone, or cobblestone.

Further, since direct sunlight is appropriately applied to the fish nest from above the front edge of the bottom plate, the water temperature is appropriately increased, and an environment favorable for growth of aquatic plants such as aquatic plants and algae is formed. In addition, since the shade is appropriately formed below the support wall, it creates a good environment for resting aquatic organisms. Moreover, the fish nest has a very good water circulation, thus forming an environment rich in oxygen and nutrients.

Further, in the head drop with fish nest according to the first or second aspect, since the front vertical wall unlike the conventional example is not erected on the front edge of the bottom plate, the flow rate of the water channel is remarkably reduced. When it does, aquatic organisms can freely pass above the front edge of the bottom plate and easily escape from the fish nest. Moreover, since driftwood and dust do not get caught on the front edge of the bottom plate, it is hard to accumulate.

Next, according to the fishway with a fish nest according to claim 3, since a tunnel-shaped fishway without a step portion is formed in the fish nest block, a cavity does not occur in the water flow, and the fishway according to claim 1 Similar to the above-mentioned head drop with fish nest, a fish nest close to nature is formed in this fishway, so it is easy for the fish to rise. In addition, since the support wall of the fish nest block functions as the ceiling of the fishway, it is possible to protect the fish on the slope from the attack of birds.

Furthermore, according to the fishway with a fish nest according to the fourth aspect, since the water flow in the fishway changes its direction from the open portion above the receiving wall to the outside of the fishway alternately, the flow velocity decreases, In addition, it is easier for the fish to rise. Moreover, since the support walls are alternately located on the opposite side, it is more difficult for birds to attack the fish.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A head drop structure with a fish nest according to a first embodiment of the present invention will be described below with reference to FIGS.
First, the fish nest block 1 used in this example is molded into a shape as shown in FIG. 1 with concrete in which reinforcing reinforcing bars are embedded, and the thickness of each part is 200 mm. It should be noted that the dimensions of the respective parts listed below are examples, and can be appropriately changed.

This fish nest block 1 is provided with a horizontal bottom plate 2 formed in the shape of a square plate, and its lateral length is 1980.
mm, the width in the front-back direction is 2000 mm. A vertical wall 3 extending in the left-right direction is integrally erected on the rear edge of the bottom plate 2,
The height from the bottom surface of the bottom plate is 1000 mm. Vertical wall 3
A support wall 4 horizontally projecting forward is integrally formed at the upper end of the, and the projecting width from the rear surface of the vertical wall is 1000 mm.

A receiving wall 5 extending in the left-right direction is integrally erected on the front edge of the bottom plate 2. The length in the left-right direction is 1830 mm, which is shorter than the bottom plate 2, and the height from the top face of the bottom plate is 3.
It is 00 mm. Therefore, an escape path 6 in the front-rear direction is formed on the right side of the receiving wall 5 at this front edge portion, and the opening width thereof is 150 mm.

A blocking wall 7 extending in the front-rear direction is integrally provided upright in the middle of the left edge of the bottom plate 2. The width in the front-rear direction is 1100 mm, which is shorter than the bottom plate 2, and the height from the top surface of the bottom plate is 2. It is 150 mm. Therefore, a left-right escape path 8 is formed between both ends of the blocking wall 7 and the vertical wall 3 and the receiving wall 5 at the left edge portion, and the opening width thereof is 250 mm.

Grooves are formed on the front surface 9 of the support wall 4 and the front surface 10 of the receiving wall 5 at intervals of 100 mm in the vertical and horizontal directions to form an uneven surface in a grid pattern. This uneven surface contributes to improving the natural feeling of the landscape and fish nests. Further, the bottom plate 2 and the support wall 4 are formed with connection holes 11 for passing bolts that connect the fish nest blocks 1 when the fish nest blocks 1 are stacked vertically.

Regarding the receiving wall 5, in addition to the embodiment shown in FIG. 1, there is no embodiment as shown in FIG.
There is a mode in which the height is lowered as shown in FIG.

Now, the drop structure with a fish nest of this embodiment is constructed by using the fish nest block 1 as shown in FIGS. 2 to 5, for example. First of all, in the head drop construction shown in FIGS. 2 to 4, the stepped concrete foundation 16 is formed on the stepped portion of the river bed 15.
Is laid in the field so as to extend in the transverse direction of the river, and stones 17 are laid on the riverbed 15 immediately upstream and downstream thereof. On the first stage of the concrete base 16, a plurality of fish nest blocks 1 are placed and lined up with the rear surface of the vertical wall 3 facing the upstream side, and the bottom plate 2 has an upper surface on which gravel, stones or boulders (hereinafter, stones). Etc. 18) are singly or combined and are laid at a uniform height or in an uneven shape to form the first step of the drop construction.

Similarly, a plurality of fish nest blocks 1 are laid in rows on the second and third steps of the concrete base 16, and further, stones 18 and the like are laid, and the second and third steps of the drop construction are carried out. Are formed. At this time, as shown in FIGS. 2 and 3, the upper bottom plate 2 is attached to the upper surfaces of the lower vertical wall 3 and the support wall 4.
By mounting the front part of the, it is possible to construct a steep head drop. Further, as shown in FIG. 4, if the upper bottom plate 2 is not applied to the upper surfaces of the lower vertical wall 3 and the support wall 4, a gentle slope heading can be constructed.

The second-stage and third-stage fish nest blocks 1 are sufficiently stabilized by their own weight. However, if bolts (not shown) are connected to the connection holes 11 of the upper base 2 and the lower support wall 4 to connect them, it is possible to more reliably prevent the fish nest blocks 1 from being displaced from each other. When subsidence or the like occurs, the fish nest blocks 1 can be connected to each other in a flexible structure. Further, as shown in FIGS. 3 and 4, anchor rebars 19 fixed to the fish nest block 1 and protruding rearward are embedded in the concrete base 16 to prevent the fish nest block 1 from being displaced due to earth pressure and flowing water. Preferably.

Next, in the head drop structure shown in FIG. 5, the fish nest blocks 1 of the first stage to the fourth stage are placed and lined up on the front surface of the existing dam 12 through the cast-in-place concrete 13. In addition, the bottom plate 2 of the upper stage is formed on the upper surfaces of the vertical wall 3 and the support wall 4 of the lower stage
The front part of the is placed and a steep head drop is constructed. Crushed stones 18 are also laid on the upper surface of the bottom plate 2. A drainage port 32 is provided through the vertical wall 3 of the fish nest block 1 so as not to block the drainage hole 14 of the dam 12.

2 to 5, the upper fish nest block 1 may be stacked directly above the lower fish nest block 1 or may be stacked in a staggered manner. In either case, the bolts can be connected.

Since the head structure with fish nest of this embodiment is constructed as described above, it has the following actions and effects. (1) Due to the following reasons, it is possible to form near-native fish nests suitable for aquatic organisms such as fish, shellfish, and crabs over a wide area. On the upper surface of the bottom plate 2 of the fish nest block 1, a shallow and wide depression surrounded by the vertical wall 3, the receiving wall 5 and the blocking wall 7 is formed, and this depression forms a fish nest close to nature. Further, since this fish nest is formed for each fish nest block 1 in each stage, the total area thereof is extremely large.

Since the upper surface of the bottom plate 2 is horizontal, it is possible to lay chestnuts or the like 18 in the fish nest. This Kuriishi, etc. 18
Is prevented from falling down forward by the receiving wall 5,
Since the blocking wall 7 prevents movement in the left-right direction, the bottom wall 2 is held at a substantially uniform thickness. The cobblestones 18 thus retained form a favorable environment for activities of aquatic organisms, spawning, and the like.

Direct sunlight is appropriately applied to the fish nests between the upper end of the receiving wall 5 and the front end of the support wall 4, so that the water temperature is appropriately increased, and an environment is favorable for the growth of aquatic plants such as aquatic plants and algae. To form. Since the shade is appropriately formed below the support wall 4, an environment good for resting aquatic organisms is formed. Since the fish nest is a shallow depression along the water stream, the water circulation is very good, forming an environment rich in oxygen and nutrients.

(2) Since the escape paths 6 in the front-rear direction are formed between the adjacent receiving walls 5, and the escape paths 8 in the left-right direction are formed on both sides of the blocking wall 7, the flow rate of the river When the water content is significantly reduced, the aquatic organism can escape from the fish nest through the escape paths 6 and 8 to the lower fish nest or waterway.

(3) Further, according to the aspect in which there is no receiving wall as shown in FIG. 4 or the aspect in which the height of the receiving wall 5 is lowered as shown in FIG. When the water is reduced, aquatic organisms can freely pass above the front edge of the bottom plate 2 and easily escape. Further, driftwood, dust, etc. do not catch on the front edge of the bottom plate 2 and are unlikely to be deposited.

By the way, the fish nest block 1 is provided with a support wall 4
Has a function of restricting the upward movement of the fish. Therefore, if the fish nest blocks 1 are lined up slightly obliquely from the transverse direction of the river to construct a head structure with a fish nest, the fish in the uphill will gather at the end of the head structure. It can be an effective catch location. On the other hand, if the fish nest block 1 without the support wall 4 is used as a part of the drop construction, the fish will be easily lifted. In this way, the elevation of the fish can be controlled.

Next, the drop structure with a fish nest according to the second embodiment of the present invention will be described with reference to FIGS. First,
The fish nest block 21 used in this embodiment is formed of concrete in which reinforcing reinforcing bars are embedded in a shape as shown in FIG.

This fish nest block 21 is provided with a horizontal bottom plate 22 formed in the shape of a rectangular plate, the left end face and the right end face of which are downwardly sloping slopes, and the horizontal length of the bottom face is 1
800 mm, width in the front-back direction is 2000 mm, thickness is 20
It is 0 mm. A vertical wall 23 extending in the left-right direction is integrally provided upright at the rear end of the bottom plate 22, and the length in the left-right direction is 2
The height from the bottom surface of the bottom plate is 1000 mm. The front surface of the vertical wall 23 is an inclined surface, and the gradient (represented by the horizontal distance when the height is 1; the same applies hereinafter) is 1 minute.

A pair of support walls 24 are integrally erected at the central portions of the left and right edges of the bottom plate 22, and the height from the top face of the bottom plate is 800 mm. The facing surface of both support walls 24 is an inclined surface, and the slope thereof is 5 minutes. A through hole 28 is formed in the center of the bottom plate 22 so as to extend downwardly from the facing surface. Also, both support walls 2
The front and rear surfaces of No. 4 are also inclined surfaces, and their slope is 1.5 minutes.

At the front edge of the bottom plate 22, a trapezoidal receiving wall 25 extending in the left-right direction is integrally erected. The upper surface of the receiving wall 25 has a horizontal length of 800 mm, which is higher than the upper surface of the bottom plate. The length is 800 mm. Therefore, the receiving wall 25
The left side and right side of is a slope with a 5 minute slope,
An escape path 2 in the front-rear direction that widens toward the left and right of them
6 is formed. In addition, a through hole 29 continuous to the upper surface of the bottom plate 22 is provided at the center of the receiving wall 25 to form a tapered hole that expands forward. The rear surface of the receiving wall 25 is an inclined surface, and the inclination thereof is 1 minute.

The receiving wall 25 is shown in FIG.
In addition to the above mode, there is a mode in which there is not at all as shown in FIG. 8 and a mode in which the height is reduced as shown in FIG.

A plurality of flat convex strips 30 extending in the left-right direction are integrally formed on the lower surface of the bottom plate 22 at intervals, and the upper surfaces of the vertical wall 23 and the support wall 24 are fitted between them. A fitting recess 31 having a width of 250 mm is formed.

Now, the drop structure with a fish nest of this embodiment is constructed by using the fish nest block 21 as shown in FIGS. 7 to 10, for example. First, the method of constructing the head drop structure of FIGS. 7 to 9 is basically the same as that of the first embodiment, and FIG.
8, FIG. 8 is FIG. 4, and FIG. 9 is each fish nest block 1 of FIG.
Is replaced by the fish nest block 21, the same members are designated by the same reference numerals in the drawings to avoid redundant description. However, the upper surfaces of the lower vertical wall 23 and the support wall 24 can be fitted into the upper fitting recess 31.

Next, in the head drop structure shown in FIG. 10, the fish nest blocks 21 of the first to third steps are inclined with respect to the concrete base 16 provided obliquely and their receiving walls 25 are provided.
Are placed and lined up with their front surfaces aligned flush with each other. A lid 3 is placed on the upper surface of the fish nest block on the third stage.
3 is covered and further covered with cast-in-place concrete 34.

7 to 10 as in the first embodiment.
In the above, the fish nest block 21 in the upper stage may be stacked directly above the fish nest block 21 in the lower stage, or may be stacked in a staggered manner.

Since the head construction with fish nest of this embodiment is constructed as described above, the same operation and effect as those of the first embodiment
In addition to (1) to (3), the following actions and effects are exhibited. (4) As described above, the lower vertical wall 23 is provided in the upper fitting recess 31.
Since the upper surfaces of the support wall 24 and the support wall 24 are fitted to each other, the upper and lower fish nest blocks 21 are prevented from being displaced from each other, particularly in the front-rear direction due to earth pressure or flowing water force.

(5) Since the front surface of the vertical wall 23, the facing surface and the front and rear surface of the support wall 24, and the slope surface of the receiving wall 25 are inclined surfaces, compared with the upright surface, It is suitable for arthropods such as crabs, crayfish, and hermit crabs to climb up and down, creating an environment in which they are easy to work.

(6) Further, through holes 28 and 29 are formed through the bottom plate 22 and the receiving wall 25, and these holes are provided on the vertical wall 23, the supporting wall 24 and the receiving wall as shown in FIG. 5 or 6. Since each of the inclined surfaces of 25 is located at the upper and lower ends of the inclined surface or in the vicinity thereof, crabs or the like climbing or descending the inclined surface are not covered with the through holes 28, 29.
It is easy to move to the upper or lower fish nest through Therefore, an environment more suitable for activities such as crabs is formed. Further, the through hole 29 also functions as an escape path in the front-rear direction.

By the way, the head drop with fish nest shown in FIG.
The front end of the bottom plate 2 of the upper fish nest block 21 is the lower vertical wall 2
Since it protrudes forward from position 3, it has the effect of controlling the upward movement of fish. Therefore, if the relative positions of the upper and lower fish nest blocks 21 in the front-rear direction are changed to increase or decrease the protrusion amount, or to eliminate the protrusion amount, the elevation of the fish can be controlled.

Next, a fish path with a fish nest according to a third embodiment of the present invention will be described with reference to FIGS. 11 to 13. 11
As shown in FIG. 5, for example, a step structure with a fish nest according to the first embodiment is constructed in the transverse direction of the river, and a fish path with a fish nest according to the present embodiment is constructed in the longitudinal direction of the river on one side of the step construction. There is. The fish nest block 1 similar to that of the first embodiment is used for this fish path, and is constructed as shown in FIGS. 12 and 13.

That is, on the river bed 15, a concrete base 35 extending in the longitudinal direction of the river and having an upper surface inclined according to the slope of the river and the step construction is cast on site. Place a plurality of fish nest blocks 1 on this upper surface so that their side faces face each other and that the receiving walls 5 of the adjacent fish nest blocks 1 are located on opposite sides of each other. It is lined up. Further, on the upper surface of the bottom plate 2 of the fish nest block 1, rubble stones 18 are laid.

Since the fishway with a fish nest of this embodiment is constructed as described above, the following actions and effects are obtained. (1) For the following reasons, a fishway that is suitable for fish is formed. Since a tunnel-shaped fish path with no steps is formed in the fish nest block 1, no cavities are generated in the water flow, and the fish easily rises.

For the same reason as in the first embodiment, since a fish nest close to nature is formed in this fish path, it is easy for the fish to rise. Less functional deterioration due to sediment accumulation. Further, in this embodiment, since the receiving walls 5 of the adjacent fish nest blocks 1 are located on the opposite sides,
Since the water flow flowing in the tunnel-shaped fishway changes its direction from the open portion above the receiving wall 5 to the outside of the fishway alternately and overflows, the flow velocity decreases and the fish tends to rise.

(2) Further, since the support wall 4 of the fish nest block 1 functions as a ceiling of the fishway, it is possible to protect the fish on the slope from birds. In particular, in this embodiment, since the support walls 4 are alternately located on the opposite side as a result of positioning the receiving wall 5 as described above, it is difficult for birds to attack.

The present invention is not limited to the configuration of the above-mentioned embodiment, and can be embodied with appropriate modifications, for example, as follows, without departing from the spirit of the invention. (1) Support wall 4 of the first embodiment and support wall 24 of the second embodiment
Provide both and. (2) Dividing and forming a fish nest block into two or more members, and using them by combining or assembling them.

[0051]

EFFECTS OF THE INVENTION Since the head drop with fish nest according to claim 1 or 2 of the present invention is configured as described above, the fish,
It is possible to form a fish nest close to nature suitable for habitat of aquatic organisms such as shellfish and crab over a wide area, and when the water flow in the waterway is significantly reduced, the aquatic organism can escape from the fish nest. Further, it has an excellent effect that driftwood and dust are hard to be accumulated.

In addition to the above-mentioned effects, according to the fishway with a fish nest according to the third aspect, it is easy for the fish to rise, and the fish in the rise can be protected from the attack of birds. The fish channel with a fish nest according to claim 4 further enhances this effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a fish nest block used in a first embodiment of the present invention.

FIG. 2 is a perspective view of a head drop construction of the first embodiment constructed by the fish nest block.

FIG. 3 is a sectional view of the head drop.

FIG. 4 is a sectional view of a modification of the first embodiment in which the relative position of the fish nest block is changed.

FIG. 5 is a cross-sectional view of another modification of the first embodiment constructed on an existing dam.

FIG. 6 is a perspective view of a fish nest block used in the second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a head drop construction of a second embodiment constructed by the fish nest block.

FIG. 8 is a sectional view of a modification of the second embodiment in which the relative position of the fish nest block is changed.

FIG. 9 is a cross-sectional view of another modification of the second embodiment constructed on an existing dam.

FIG. 10 is a sectional view of still another modification of the second embodiment.

FIG. 11 is a plan view of a river in which a fishway according to the third embodiment is constructed.

FIG. 12 is a perspective view of the fishway.

FIG. 13 is a cross-sectional view of the fishway.

[Explanation of symbols]

 1 Fish nest block 2 Bottom plate 3 Vertical wall 4 Support wall 5 Retaining wall 6 Escape route 21 Fish nest block 22 Bottom plate 23 Vertical wall 24 Support wall 25 Receiving wall 26 Escape route

Claims (4)

[Claims] 1. A fish nest block having a bottom plate, a vertical wall extending in the left-right direction, which is provided upright at a rear edge of the bottom plate, and a support wall which projects forward from an upper end of the vertical wall. Then, the fish nest blocks are arranged in a row in the transverse direction of the water channel so that the rear surface of the vertical wall faces the upstream side to form a lower stage, and the next fish nest block is arranged vertically above the fish nest block in the lower stage. A head drop with fish nest that is formed by lining up so that the rear surface of the wall faces the upstream side and forming the upper stage. 2. A fish nest block comprising a bottom plate, a vertical wall extending in the left-right direction which is provided upright on the rear edge of the bottom plate, and a support wall which is provided upright in the middle of the bottom plate. The fish nest blocks are arranged in a row in the transverse direction of the water channel so that the rear surface of the vertical wall faces the upstream side to form a lower stage, and the next fish nest block is formed above the lower fish nest block in the vertical wall. A head drop with fish nest that is formed by lining up so that the rear surface faces the upstream side and forming the upper stage. 3. A bottom plate, a vertical wall extending in the left-right direction upright at a rear edge of the bottom plate, a support wall projecting forward from an upper end of the vertical wall, and a front edge of the bottom plate. A fishway with a fish nest, which uses a fish nest block provided with an upright and leftwardly extending receiving wall, and the fish nest blocks are arranged in a row in a longitudinal direction of a water channel so that their side faces face each other. 4. The fishway with a fish nest according to claim 3, wherein the receiving walls of adjacent fish nest blocks are alternately located on opposite sides.