Ecologically simulated fish fry rewilding training fishway and rewilding training method

Abstract

The present invention relates to the technical field of fish reproduction and release facilities, and specifically to an ecologically simulated fish fry wilding training fishway and a wilding training method. A water reservoir, a water supply unit, a return water unit, a fishway body, and an inlet fishway; the water supply unit is used to supply water from the water body to the water reservoir; one end of the fishway body is connected to the water reservoir through a water discharge valve, and the other end of the fishway body is connected to the water body through an inlet fishway; a water retaining gate is provided on the inlet fishway; a first resting pool, a second resting pool, and a third resting pool are provided in the fishway body; a number of stone steps are provided on the fishway body; and at least two water retaining steps are also provided. In response to the technical problem of low survival rate of released fry, the present invention is more in line with the characteristics of the wild habitat of released fish, and can train the fry's ability to adapt to natural water bodies by adjusting the flow rate and flow rate in the fishway body, meet the needs of fish wilding training, and also meet the needs of zoned breeding in the fishway body at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of fish proliferation and release facilities, and in particular to an ecologically simulated fish fry wilding training fishway and a wilding training method. Background Art

[0002] The fry currently being artificially bred in the fish breeding and release stations have sufficient feed and excellent conditions, but they rarely get exercise. The fish have poor physical constitution and weak swimming ability, which makes them intolerant to handling. They are inevitably damaged during the process of catching, transporting, temporarily holding and counting before release, resulting in a low survival rate after release. After entering the natural habitat, the probability of becoming food for predators increases, and the probability of death is higher than that of wild individuals. Summary of the Invention

[0003] In response to the technical problem of low survival rate of released fish fry, the present invention provides an ecologically simulated fish fry rewilding training fishway and rewilding training method, which is closer to the wild habitat characteristics of released fish. By adjusting the flow rate and flow rate in the fishway pond, the ability of fish fry to adapt to natural water bodies can be trained, thereby meeting the needs of fish rewilding training and the needs of zoned breeding in the fishway pond.

[0004] The technical solution provided by the present invention is: an ecological fishway for wild fry training, comprising a water reservoir, a water supply part, a return water part, a fishway body, and an inlet fishway; the water reservoir is located at a high place, and a water treatment facility is provided in the water reservoir; the water supply part is used to supply water from the water body to the water reservoir; the fishway body extends from a high place to a low place, and slopes are provided on both sides of the fishway body, one end of the fishway body is connected to the water reservoir through a discharge valve, and the other end of the fishway body is connected to the water body through the inlet fishway; a discharge pipe is provided at one end of the fishway body close to the inlet fishway, and the discharge pipe is used to connect to the water body, and a discharge valve is provided on the discharge pipe; a water retaining gate is provided on the inlet fishway, and a fish blocking net is provided on the top of the water gate; the return water part comprises a circulating water pump and a return water pipe, and the return water pipe is connected to the end of the fishway body end and a water reservoir, the circulating water pump is arranged at the end of the fishway pool body, on the connecting path between the return water pipe and the water reservoir, and the return water pipe is provided with a return water control valve; the fishway pool body is provided with a first rest pool at one end close to the water reservoir, the fishway pool body is provided with a second rest pool at one end close to the inlet fishway, and at least one third rest pool is provided in the middle of the fishway pool body, and the third rest pool is located between the first rest pool and the second rest pool; a plurality of stone ridges are provided on the fishway pool body, and the stone ridges include a plurality of stones arranged at intervals along a direction perpendicular to the extension direction of the fishway pool body; and also include at least two water retaining ridges, at least one water retaining ridge is located between the first resting pool and at least one third resting pool, and at least one water retaining ridge is located between the second resting pool and at least one third resting pool, and the water retaining ridges are stone ridges with sandbags filled in the vertical seams.

[0005] Optionally, the water supply unit includes a pumping station and a pipeline. The pumping station includes several submersible pumps. The submersible pumps are located one meter below the dead water level of the water body. The pumping station is connected to the water reservoir through a pipeline.

[0006] Optionally, when there are two or more third rest pools, at least one water retaining ridge is located between different third rest pools.

[0007] Optionally, the distance between adjacent stone steps is 3m, the spacing between stones in each row of the stone steps is 0.2-0.4m, and the diameter of the stones is 0.7m-1.0m.

[0008] Optionally, the height of the water retaining ridge is 0.4m.

[0009] Optionally, the slope ratio of the fishway pool body is 0.5%, and the bottom slopes of the first rest pool, the second rest pool and the third rest pool are 0.

[0010] Optionally, the water depth in the fishway pool is 0.5-0.8m.

[0011] Optionally, a fry escape prevention device is provided at the pipe mouth of the water discharge pipe.

[0012] A rewilding training method, utilizing the above-mentioned eco-simulated fry rewilding training fishway, comprising: an initial training lasting 20 days and a later training lasting 10 days; the initial training comprises initial water rewilding training, initial bait type adjustment and initial feeding method adjustment; when performing the initial water rewilding training, the opening of the drain valve is adjusted daily or regularly, the flow rate and flow velocity in the fishway pool are slowly adjusted, the water depth in the fishway pool is controlled to vary within the range of 0.4-0.5m, and the flow velocity in the fishway pool is controlled to vary within the range of 0.1-0.2m / s; when performing the initial bait type adjustment, on the basis of feeding floating feed, live bait is gradually increased, 20% of live bait is increased every week, and the proportion of floating feed is reduced, eventually reaching about 50% of live bait and floating feed; when performing the initial feeding method adjustment, the daily scheduled, fixed-point and quantitative feeding is gradually adjusted to irregular, irregular and fixed-point feeding every day. The feeding is not quantitative, and the total daily feeding amount remains unchanged during the initial feeding method adjustment period; the later training includes later water rewilding training, later feeding method adjustment and anti-predator ability training; during the later water rewilding training, 10 days before the fry are released, the opening of the water discharge valve is adjusted daily or regularly, the flow rate and flow rate in the fishway pond are adjusted, the water depth in the fishway pond is controlled to vary within the range of 0.6-0.8m, and the flow rate in the fishway pond is controlled to vary within the range of 0.3-0.5m / s; when the later feeding method is adjusted, the feeding amount is reduced by 20% every day from 10 to 5 days before the fry are released, and feeding is stopped 5 days before release; during the anti-predator ability training, 10 days before the fry are released, small-sized alien predator species of 10-15cm are placed in the fishway pond, and one alien predator species is placed for every 1,000 to 10,000 fry to train the fry in anti-predator ability.

[0013] Beneficial effects

[0014] The technical solution provided by the present invention has the following beneficial effects compared with the existing technology: in response to the technical problem of low survival rate of released fish fry, the present invention provides an ecologically simulated fish fry wild training fishway and wild training method, which are closer to the wild habitat characteristics of released fish. By adjusting the flow rate and flow rate in the fishway pond, the ability of fish fry to adapt to natural water bodies can be trained, thereby meeting the needs of fish wild training and the needs of zoned breeding in the fishway pond. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the ecologically simulated fish fry wilding training fishway proposed in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the partial structure of the ecologically simulated fish fry wild training fishway proposed in an embodiment of the present invention.

[0017] Figure 3 for Figure 2Schematic diagram of the cross-sectional structure in the AA direction. DETAILED DESCRIPTION

[0018] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0019] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended solely to illustrate the relevant inventions and are not intended to limit the inventions. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the drawings. Terms such as "first" and "second" in the present application are provided for the convenience of describing the technical solutions of the present invention and do not have a specific limiting effect. They are general references and do not constitute a limitation on the technical solutions of the present invention. It should be noted that the embodiments and features therein in the present application may be combined with each other unless there is a conflict. In the description of the present invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present invention.

[0020] Example 1

[0021] Combined with attachment Figure 1-3This embodiment proposes an ecological fry wild training fishway, including a water reservoir 100, a water supply unit, a water return unit, a fishway body 101, and an inlet fishway 102; the water reservoir 100 is located at a high place, and a water treatment facility is provided in the water reservoir 100; the water supply unit is used to supply water from the water body to the water reservoir 100; the fishway body 101 extends from a high place to a low place, and slopes are provided on both sides of the fishway body 101. One end of the fishway body 101 is connected to the water reservoir 100 through a water discharge valve. The other end of the body 101 is connected to the water body through the water inlet fishway 102; a discharge pipe 103 is provided at one end of the fishway body 101 near the water inlet fishway 102, and the discharge pipe 103 is used to connect to the water body, and a discharge valve is provided on the discharge pipe 103; a water retaining gate 104 is provided on the water inlet fishway 102, and a fish intercepting net is provided on the top of the water gate; the return water part includes a circulating water pump and a return water pipe 105, and the return water pipe 105 connects the end of the fishway body 101 and the water reservoir 100, and the circulating water pump is provided. At the end of the fishway pool body 101, on the communication path between the return water pipe 105 and the water reservoir 100, a return water control valve is provided on the return water pipe 105; a first resting pool 111 is provided at one end of the fishway pool body 101 close to the water reservoir 100, a second resting pool 112 is provided at one end of the fishway pool body 101 close to the inlet fishway 102, and at least one third resting pool 113 is provided in the middle of the fishway pool body 101, and the third resting pool 113 is located between the first resting pool 111 and the second resting pool 112 The fishway body 101 is provided with a plurality of stone ridges 12, and the stone ridges 12 include a plurality of stones 121 arranged at intervals along a direction perpendicular to the extension direction of the fishway body 101; it also includes at least two water retaining ridges 13, at least one water retaining ridge 13 is located between the first rest pool 111 and the at least one third rest pool 113, and at least one water retaining ridge 13 is located between the second rest pool 112 and the at least one third rest pool 113, and the water retaining ridge 13 is a stone ridge 12 with sandbags 131 filled in the vertical seams.

[0022] The eco-friendly fishway for fry rewilding training of the present embodiment is closer to the characteristics of the wild habitat of released fish. By adjusting the flow rate and flow velocity in the fishway pond 101, the ability of fry to adapt to natural water bodies can be trained to meet the needs of fish rewilding training, such as the needs of upstream domestication of migratory fish, rewilding training of fry habitats, and rewilding training of feeding-anti-predation abilities, etc. It can also meet the needs of zoned farming in the fishway pond 101.

[0023] The fishway for training fish fry in the wild of this embodiment can be set up near a water body such as a river, a stream or a reservoir. When it is implemented, the topography of the water body can be flexibly utilized to ensure that the fishway pool 101 extends from a high point to a low point. The slope ratio of the fishway pool 101 can be 0.5%. The reservoir 100 is located at a high point, which is the highest point of the fishway for training fish fry in the wild. In one embodiment, the effective volume of the reservoir 100 is not less than 1000m3 .

[0024] The water in reservoir 100 comes from a nearby body of water. The water supply unit delivers this water to reservoir 100 for use in the ecologically simulated fry rewilding training fishway. The advantage of using this water source is that fish will eventually migrate to that body. Therefore, using this water source for the ecologically simulated fry rewilding training fishway improves fish adaptability and is more environmentally friendly. The water in reservoir 100 is released into the fishway body 101 through a drain valve, which can be controlled either electrically or manually.

[0025] In a preferred embodiment, water treatment facilities are also provided in the water reservoir 100. For example, water treatment facilities such as filters and ultraviolet disinfection devices are provided at the bottom of the water reservoir 100 for filtering and purifying water quality, so that the water from the water body accumulated in the water reservoir 100 is precipitated and filtered before flowing into the fishway tank body 101 by gravity, thereby reducing pollution to the fishway for ecological fry wild training, reducing maintenance costs to a certain extent, and also ensuring the survival rate of fish.

[0026] In one embodiment, the water supply unit includes a pump station 141 and a pipeline 142. Pump station 141 is connected to the water reservoir 100 via pipeline 142. Pump station 141 includes several submersible pumps, each located one meter below the dead water level. There are at least three submersible pumps, creating a three-in-one backup system to ensure water supply to the water reservoir 100.

[0027] In one embodiment, the bottom width of the fishway pond 101 is 5m, the maximum depth is about 1.5m, and the top width is 8m. The water depth for fry breeding is generally 0.5-0.8m, so the water depth in the fishway pond 101 can be 0.5-0.8m. In this embodiment, the maximum water flow rate of the ecological fry wild training fishway during operation is about 0.59m. 3 / s.

[0028] The fishway pond body 101 and the slope are compacted with original soil, mixed with pebbles and boulders, and paved with 600g / m 2 Geotextile, 1.5mm HDPE single rough surface geomembrane and 600g / m 2 The bottom of the fishway pond 101 can also be paved with fine gravel, pebbles, etc. according to the habitat needs of fish.

[0029] This embodiment is also provided with a first resting pool 111, a second resting pool 112 and at least one third resting pool 113 for fish to rest and improve the survival rate of fish. The water flow in the first resting pool 111, the second resting pool 112 and the third resting pool 113 is relatively slow and the terrain is relatively flat. The first resting pool 111 and the second resting pool 112 are preferably distributed at the head and tail of the fishway pool body 101, and the at least one third resting pool 113 is located in the middle of the fishway pool body 101. In a preferred embodiment, the total area of ​​the first resting pool 111, the second resting pool 112 and the at least one third resting pool 113 is at least 1000m 2 The bottom slopes of the first rest pool 111, the second rest pool 112 and the third rest pool 113 are 0.

[0030] In this embodiment, there are also arranged stone steps 12, and there are multiple groups of stone steps 12 along the extension direction of the fishway pool 101. The layout of the stone steps 12 is to dissipate energy and reduce the flow in the fishway pool 101. At the same time, it can also simulate the conditions of natural water bodies to a certain extent, and be closer to the wild habitat characteristics of released fish. The diameter and spacing of the stone 121 are determined based on the experience value and the flow rate required for training fry. The water depth for fry breeding is generally 0.5 to 0.8m, so the water depth in the fishway pool 101 can be 0.5 to 0.8m. Combined with the above-mentioned embodiment, the maximum water flow rate of the ecological fry wild training fishway during operation is about 0.59m 3 / s, and the spacing between the rocks 121 can generally be 0.2 to 0.4 meters. The cross-section of the rock steps 12 generally accounts for 20% to 30% of the flow area. In one embodiment, a group of rock steps 12 can be set every 3 meters in the fishway pond 101. A group of rock steps 12 consists of one or more rows of rocks 121. Each row of rocks 121 can have 6 rocks, with a spacing of 0.3 meters. The rocks 121 have a diameter of 0.7 to 1.0 meters.

[0031] In addition to the rock sill 12, the eco-friendly fry rewilding training fishway of this embodiment is further provided with a water retaining sill 13. The water retaining sill 13 is a rock sill 12 with sandbags 131 filled in the vertical seams. When the gaps in the vertical seams of the rock sill 12 are filled with sandbags 131, a water retaining effect is achieved, thereby forming the water retaining sill 13. The laying height of the sandbags 131 also determines the water retaining height. In one embodiment, the laying height of the sandbags 131 is 0.4m, thereby making the height of the water retaining sill 13 0.4m. The height of the water retaining sill 13 is 0.4m, which is slightly lower than the minimum aquaculture water depth of 0.5m. This ensures that the minimum aquaculture water depth conditions are met within the fishway pond 101 and controls the flow rate within the fishway pond 101.

[0032] Since the fishway for ecological fry wild training is long and has a certain flow rate, there may be uneven distribution of fry during breeding. Therefore, it is considered to set several water retaining barriers 13 in the fishway pond 101 to divide the fishway pond 101 into at least three areas for fry breeding and domestication.

[0033] When a water retaining dam 13 is provided, the flow velocity at the top of the water retaining dam 13 will be relatively high, thereby exceeding the speed of the fry's sudden swimming. The fry on the downstream side cannot pass through the water retaining dam 13, while the fry on the upstream side will seek a slow-flowing area to survive, away from the water retaining dam 13. Therefore, the provision of the water retaining dam 13 can create conditions for upstream and downstream zoned breeding, preventing all the fry from being concentrated together and causing excessive breeding density. In one embodiment, when one third resting pool 113 is provided, two 0.4m high water retaining dams 13 are provided in the fishway pool body 101, dividing the fishway into three areas for fry breeding and domestication, located respectively between the first resting pool 111 and the third resting pool 113, and between the second resting pool 112 and the third resting pool 113.

[0034] In this embodiment, the use of sandbags 131 as water barriers 13 provides greater flexibility and convenience, and makes it easier to adjust the number, location, and height of water barriers 13 based on the fry's preferred flow rate and rewilding training. For example, if the fry are less able to swim, four or more water barriers 13 may be required, or the water barriers 13 may be raised to reduce the flow rate within the fishway body 101. For example, if there are two or more third resting pools 113, at least one water barrier 13 can be located between different third resting pools 113.

[0035] In this embodiment, the fishway pool body 101 is connected to the water body through the inlet fishway 102, and the fish in the fishway pool body 101 eventually enter the adjacent water body through the inlet fishway 102. A water retaining gate 104 is provided on the inlet fishway 102. In one embodiment, the water retaining head is designed to be 0.8m, and the gate sill elevation is 3252.78m. Furthermore, a fish blocking net can be provided on the top of the water retaining gate 104 to prevent fish from passing through the top of the gate. In one embodiment, the fish blocking net is 0.4m high, and the network pores are approximately 1cm×1cm. The water retaining gate 104 and the fish blocking net can be a detachable combined structure. For example, the fish blocking net and the gate are connected with bolts to form a whole, which can be easily disassembled for maintenance and replacement.

[0036] In this embodiment, a drain pipe 103 and a drain valve are provided at the end of the fishway tank 101 to release water into the water body, thereby further controlling the water level in the fishway tank 101. Furthermore, a fry escape prevention device can be provided at the outlet of the drain pipe 103 to prevent the fry from escaping.

[0037] The eco-friendly fish fry wild training fishway of this embodiment adopts partial circulation aquaculture and realizes water recycling by providing a return water part, which plays the role of saving water resources, regulating the water volume of the fishway, and saving the use and consumption of the water supply part.

[0038] The return water section includes a circulating water pump and a return water pipe 105. The return water pipe 105 connects the end of the fishway tank 101 and the reservoir 100. The circulating water pump is located at the end of the fishway tank 101, connecting the return water pipe 105 and the reservoir 100. A return water control valve is installed on the return water pipe 105. Circulating water flows back through the return water section to the reservoir 100 or the fishway tank 101. The return water can be controlled by adjusting the power or number of the circulating water pumps and the opening of the return water control valve. In a preferred embodiment, the return water section can be replenished by approximately 20% of its water volume daily.

[0039] Part of the working method of the ecological fish fry wild training fishway in this embodiment is as follows: when the ecological fish fry wild training fishway is activated, the number and position of the water retaining ridges 13 are determined, sandbags 131 are laid on the corresponding stone ridges 12 to form the water retaining ridges 13, the water retaining gate 104 at the end of the fishway is closed, the water supply part and the return water part are started, the waterproof valve of the water reservoir 100 is opened, and the return water control valve is opened, so that the water depth in the fishway pool body 101 is maintained at 0.5m and a micro-flow state.

[0040] When the flow rate and water depth of the fishway for ecological fry wild training are adjusted, the amount of water in the fishway pool 101 can be replenished by increasing the amount of recycled water from the circulating pump, thereby increasing the fishway flow rate, water depth and other acclimation conditions; by releasing water through the drain pipe 103 and reducing the amount of recycled water from the circulating pump, the fishway flow rate, water depth and other acclimation conditions can be reduced.

[0041] When the ecological fry wild training fishway is stopped, the sandbags 131 in the fishway pool 101 are removed as needed, the water valve is opened, and the circulating water pump is turned off, and the fishway can stop running. The above operations can also control the water depth of the fishway as needed.

[0042] When releasing fry into the ecological fry wild training fishway, the sandbags 131 in the fishway are cleared, the water release valve is opened, the circulating water pump is turned off, and the water retaining gate 104 is lifted at the same time, all the water release valves of the reservoir 100 are opened, and all water is discharged into the fishway pool 101. The fry can then directly enter the adjacent water body through the water inlet fishway 102 with the water body.

[0043] Example 2

[0044] Combined with attachment Figure 1-3This embodiment employs a rewilding training method using the eco-friendly fish fry rewilding training fishway described in the technical solution of Example 1. The method includes: initial training lasting 20 days and later training lasting 10 days. The initial training includes initial water rewilding training, initial bait type adjustment, and initial feeding method adjustment; the later training includes later water rewilding training, later feeding method adjustment, and anti-predator training.

[0045] During the initial water rewilding training, the opening of the water discharge valve is adjusted daily or regularly, and the flow rate and flow velocity in the fishway pond 101 are slowly adjusted to control the water depth in the fishway pond 101 to vary within the range of 0.4 to 0.5 m, and the flow velocity in the fishway pond 101 to vary within the range of 0.1 to 0.2 m / s, so that the fry gradually adapt to the simulated ecological water habitat.

[0046] During the initial feed adjustment phase, gradually add live bait to the floating feed, increasing the live bait by 20% each week and reducing the floating feed ratio, ultimately reaching a 50% / 50% ratio of live bait and floating feed. During this period of feed adjustment, the fry's basic intake can be guaranteed, while live bait can make it easier for them to eat, allowing them to gradually adapt to the wild environment.

[0047] During the initial feeding adjustment, the system gradually shifts from daily feeding at fixed times, locations, and quantities to feeding at irregular times, locations, and quantities. During this period, the total daily feed amount remains constant. This is also used to simulate the uncertainty of predation in the wild, allowing the fry to gradually adapt to the wild environment.

[0048] When conducting the later stage of rewilding training with flowing water, 10 days before the fry are released, the opening of the drain valve is adjusted daily or regularly, the flow rate and flow velocity in the fishway pond 101 are adjusted, the water depth in the fishway pond 101 is controlled to vary within the range of 0.6 to 0.8 m, and the flow velocity in the fishway pond 101 is controlled to vary within the range of 0.3 to 0.5 m / s. During this period, the fry can better adapt to the variable flow velocity of water bodies in the wild, thereby further achieving the purpose of rewilding training. It should be noted that the water depth and flow velocity in the fishway pond 101 are controlled within the above range, mainly because if the flow velocity in the fishway pond 101 is too fast and exceeds the continuous swimming speed of the fish, all the fry will be washed to the downstream area of ​​the fishway pond 101, and the purpose of effective training and zoning breeding of the fry cannot be achieved.

[0049] When adjusting feeding practices later in life, reduce the daily feed intake by 20% from 10 to 5 days before release, and then completely stop feeding the fry until 5 days before release. During this period, introducing a limited amount of bait into the rearing environment can effectively cultivate the fry's feeding ability, improve their feeding success rate, and contribute to their survival rate after release. The main reason for maintaining a 5-day feeding period is that excessively long feeding periods weaken the fish, hindering their growth. However, not stopping feeding or stopping feeding for too short a period weakens their foraging ability, also hindering survival. Based on practical experience, reducing feeding 10 days before release and stopping feeding for 5 days before release are most beneficial for the fry's growth during the rewilding period and improving their survival rate after release.

[0050] Short-term exposure to harmful fish or predation information stimulation before release can improve the anti-predation ability of fish, and the ability to escape from natural enemies can be quickly improved by short-term exposure to natural enemies before release. Therefore, this embodiment further conducts anti-predation ability training in the later training. Since the density of fry breeding in the wild training site is much higher than that in the wild river, after the ferocious fish are put in during anti-predation training, they may prey on a large number of fry in a short period of time, which will affect the scale of reproduction and release. In order to achieve the anti-predation training effect without affecting the release scale, this embodiment puts small-sized foreign predatory fish species of 10 to 15 cm into the fishway pond body 101 10 days before the fry are released. For every 1,000 to 10,000 fry, one foreign predatory fish species is put in to conduct anti-predation training on the fry in order to achieve a certain anti-predation training effect.

[0051] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A rewilding training method using an ecologically simulated fry rewilding training fishway, characterized in that: The ecological fish fry wild training fishway includes a reservoir, a water supply part, a return water part, a fishway body, and an inlet fishway; The water reservoir is located at a high place and is provided with a water treatment facility; the water supply part is used to supply water from the water body to the water reservoir; the fishway pool body extends from a high place to a low place, and is provided with side slopes on both sides of the fishway pool body; one end of the fishway pool body is connected to the water reservoir through a water discharge valve, and the other end of the fishway pool body is connected to the water body through the inlet fishway; a discharge pipe is provided at one end of the fishway pool body close to the inlet fishway, the discharge pipe is used to connect to the water body, and a discharge valve is provided on the discharge pipe; a water retaining gate is provided on the inlet fishway, and a fish intercepting net is provided on the top of the water gate; The return water part includes a circulating water pump and a return water pipe, the return water pipe connects the end of the fishway pool body and the water reservoir, the circulating water pump is arranged on the communication path between the end of the fishway pool body, the return water pipe and the water reservoir, and the return water pipe is provided with a return water control valve; The fishway body is provided with a first resting pool near one end of the water reservoir, a second resting pool is provided near one end of the fishway body entering the water, and at least a third resting pool is provided in the middle of the fishway body, and the third resting pool is located between the first resting pool and the second resting pool; The fishway pool body is provided with a plurality of stone steps, wherein the stone steps include a plurality of stones arranged at intervals along a direction perpendicular to the extension direction of the fishway pool body; The invention also includes at least two water retaining ridges, at least one of which is located between the first rest pool and the at least one third rest pool, and at least one water retaining ridge is located between the second rest pool and the at least one third rest pool, wherein the water retaining ridges are stone ridges with sandbags filled in the vertical seams; The rewilding training method includes: initial training lasting 20 days and later training lasting 10 days; The initial training includes initial water rewilding training, initial bait type adjustment and initial feeding method adjustment; During the initial water rewilding training, the opening of the water discharge valve is adjusted daily or regularly, and the flow rate and flow velocity in the fishway pool are slowly adjusted to control the water depth in the fishway pool to vary within the range of 0.4 to 0.5 m, and the flow velocity in the fishway pool to vary within the range of 0.1 to 0.2 m / s; When adjusting the initial feed types, gradually add live feed on top of floating feed, increasing the live feed by 20% each week and reducing the proportion of floating feed, until the final ratio reaches 50% each. When adjusting the feeding method in the initial stage, the feeding should be gradually adjusted from fixed time, fixed location and fixed quantity to irregular time, irregular location and irregular quantity. During the adjustment of the feeding method in the initial stage, the total amount of feeding per day should remain unchanged. The latter stage training includes the latter stage water rewilding training, the latter stage feeding mode adjustment and the anti-predation ability training; During the later stage of water rewilding training, 10 days before the release of fry, adjust the opening of the water discharge valve daily or regularly, adjust the flow rate and flow velocity in the fishway pool, control the water depth in the fishway pool within the range of 0.6-0.8m, and control the flow velocity in the fishway pool within the range of 0.3-0.5m / s; When adjusting the feeding method in the later stage, reduce the feeding amount by 20% every day from 10 to 5 days before the release of fry, and stop feeding 5 days before release; When conducting anti-predation training, 10 days before the release of the fry, small-sized alien predatory fish species of 10 to 15 cm are placed in the fishway pond. For every 1,000 to 10,000 fry, one alien predatory fish species is placed to conduct anti-predation training on the fry.

2. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 1, characterized in that: The water supply unit includes a pump station and pipelines. The pump station includes several submersible pumps. The submersible pumps are located one meter below the dead water level of the water body. The pump station is connected to the water reservoir through pipelines.

3. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 2, characterized in that: When there are two or more third rest pools, at least one water retaining ridge is located between different third rest pools.

4. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 1, characterized in that: The distance between adjacent stone steps is 3m, the spacing between stones in each row of the stone steps is 0.2-0.4m, and the diameter of the stones is 0.7m-1.0m.

5. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 1, characterized in that: The height of the water retaining ridge is 0.4m.

6. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 1, characterized in that: The slope ratio of the fishway pool body is 0.5%, and the bottom slopes of the first rest pool, the second rest pool and the third rest pool are 0.

7. The method for rewilding fry using an ecologically simulated fishway according to claim 1, characterized in that: The water depth in the fishway pool is 0.5-0.8m.

8. The method for rewilding fry using an ecologically simulated rewilding fishway according to claim 1, characterized in that: A fry escape prevention device is provided at the pipe mouth of the water discharge pipe.

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