43 results about "Fish migration" patented technology

This invention discloses a fishway illumination-based fish-attracting experimental device, belonging to the field of fish-attracting experimental technology. It includes: an experimental water tank, positioned above a reservoir, divided into an upstream, midstream, and downstream section, with an adaptation zone in the downstream section; a support frame erected above the midstream section, covered with a black cloth; and an illumination mechanism located on the upper wall of the midstream section, comprising LED lights and connecting components. Through the structural design of the connecting components, this invention allows for multi-dimensional flexible adjustment of the LED lights' horizontal position, illumination angle, and vertical height, breaking the limitations of fixed illumination modes in traditional experimental devices. The position and angle of the illumination can be adjusted according to experimental needs, and the adjustment operation is simple and convenient. It enables multi-parameter illumination research, allowing for quantitative study of the impact of different illumination conditions on fish migration behavior, meeting the needs of different experimental scenarios, and providing support for personalized fish-attracting research.

The invention discloses a partition plate type fishway built on a floodplain, and relates to the technical field of fishways, the partition plate type fishway comprises a fishway and a movable cover plate, the fishway is a partition plate vertical seam type fishway, the movable cover plate is arranged at an opening in the upper end of the fishway, and the movable cover plate is detachably connected with the fishway. According to the partition plate type fishway built on the floodplain, fish migration can be achieved for a floodplain type river channel, and silt can be prevented from blocking the fishway when river water overflows the floodplain.

The application discloses a non-constant flow water-saving type flipper step type fishway and a fish migration method. A plurality of flippers are arranged in the fishway body along the length direction of the fishway body. Each flipper transversely divides the fishway body, thereby forming a plurality of migration pools surrounded by two adjacent flippers. The elevation of the upper end of each flipper gradually decreases along the water flow direction. All the flippers can connect or disconnect the adjacent migration pools. The first flipper, the second flipper, the third flipper and the like are opened and closed in turn according to the set rhythm until the uppermost flipper. The fish enters the upper migration pool in the opening process of the flipper and migrates step by step, thereby realizing the fish flip. The application basically has no requirement on the swimming ability of the fish. The drop water formed in the opening process of the flipper has an attracting effect on the fish, is very beneficial to the fish migration, and the water flow for realizing the migration is smaller than that of the existing fishway.

The present application belongs to the technical field of hydraulic engineering and environmental protection engineering facilities, and particularly relates to an ecological flow releasing facility with a fishway and a construction method thereof. The present application is directed to the reconstruction and expansion of hydraulic engineering with ecological requirements. The fishway and the ecological flow releasing system adopt a short tunnel around dam scheme, which has little influence on other buildings of the hub. Rock plug is used for water retaining, and the installation of the water retaining gate is completed before the flood season, thereby avoiding the risk of flood control during the construction period due to the increase of the retaining and releasing water buildings caused by the reconstruction and expansion. The overall layout of the fishway engineering and the ecological flow releasing facility is considered, the tunnel section adopts the layout of the fishway on the top and the ecological releasing pipe on the bottom, the tunnel section type is beneficial to the stability of the surrounding rock, the construction difficulty is small, and the excavation and support amount is small. The tunnel section adopts a sunlight fiber optic introduction system for lighting, which can make the fishway tunnel section more close to the natural conditions, and the adverse effects of the fishway tunnel section engineering on fish migration are minimized.

The utility model discloses a fish releasing swing valve capable of being rapidly opened and closed. The fish releasing swing valve comprises a valve body, a valve plate and an oil cylinder. According to the utility model, the split type valve plate is matched with the scissor type hinged linkage mechanism, and the opening and closing stroke of the valve plate is obviously shortened by utilizing the synchronous reverse swinging of the symmetrical swing arms under the driving of the oil cylinder, so that the quick opening and closing are realized; the problem of response lag caused by long-stroke movement of a single valve plate of a traditional swing valve is solved, and the swing valve is particularly suitable for fish migration channel valve scenes with high requirements for opening and closing efficiency.

The invention provides a fishway and dam integrated device integrating multi-depth entrances and exits and multi-direction water replenishing and fish luring and an operation method, and belongs to the technical field of fishways. The device comprises a gravity dam section, a stepped fishway integrated in the gravity dam section and a water replenishing pipeline pre-buried in a wall body of the gravity dam section; the upstream side and the downstream side of the gravity dam section are provided with multi-elevation entrances and exits and matched gates respectively, a fishway bottom plate and partition plates of the stepped fishway are distributed in a stepped mode, and the water supplementing pipeline is provided with multi-direction water supplementing sprayers around the fishway entrance. According to the operation method, through cooperative opening and closing of multi-depth inlets and outlets, multi-direction and multi-flow-speed fine regulation and control of water supplementing nozzles, stepped fishway energy dissipation and flow aiding and dam water retaining mode switching, fishway and dam structure function integration is achieved. Extra land acquisition and pouring are not needed, the engineering cost and construction difficulty are reduced, the method can adapt to dynamic changes of the water level of the reservoir, migration depth preferences of different fishes are considered, the fish luring and passing efficiency is improved, and the fish passing window period is prolonged.

The invention discloses a lake ecology appropriate water level determination method based on juvenile fish migration and adult fish fattening, and relates to the field of water ecology and water conservancy projects. The method comprises the following steps: acquiring lake basic data; establishing a two-dimensional hydrodynamic model, and simulating a hydrodynamic field in key periods of migration of juvenile fishes and fattening of adult fishes of the target fishes; constructing a habitat model, and calculating a habitat suitability index HSI and a weighted available area WUA; constructing a water level-WUA response curve and performing segmentation fitting; identifying a WUA stable high-value platform through a first-order derivative threshold value, and determining a suitable water level interval; and establishing scheduling mapping between the appropriate water level and the upstream discharged flow. According to the method, water level-habitat quantitative association is realized according to the staging habitat requirements of four major Chinese carps in the Yangtze River, an operable scheduling threshold value is output, the problems that a traditional method is not staging, the index is single and the method is disjointed with engineering are solved, and the method is suitable for ecological scheduling and management of riverway-communicated lakes.

The invention discloses a cobitidae fish migration channel simulating natural hydraulic conditions and a design method, and relates to the technical field of fish migration channels, the cobitidae fish migration channel simulating the natural hydraulic conditions comprises a river bank, a water channel is arranged on the river bank, and a dam is transversely arranged in the middle of the water channel. A traditional fishway is mainly designed for economic fishes with high swimming capacity, and a substantive ecological barrier is formed for benthic species with weak swimming capacity such as cobidae fishes. According to the invention, through intelligent linkage of the liftable rockfill dam and the self-adaptive inclined plate, a continuous adjustable hydraulic condition from an almost barrier-free gentle slope to a controllable challenging step is created. Especially in a dry season / juvenile fish period mode, the fishway is converted into a continuous smooth slope, so that juvenile fishes and weak individuals can easily move upwards in a creeping mode close to a natural state, and the migration blocking problem is fundamentally solved.

The utility model discloses integrated fish migration channel monitoring equipment which comprises a channel shell, a flow velocity detector is arranged at the inlet end of the channel shell, an elastic expansion shell is fixed to the inner wall of the channel shell, a channel is conical after the elastic expansion shell expands, and a mounting plate and a lifting support are arranged at the top of the flow velocity detector. A capturing box and a moving mechanism are arranged at the outlet end of the channel shell, a light supplementing lamp belt and an outlet collecting piece are arranged at the position close to the outlet end of the channel shell, the light supplementing lamp belt is located on the bottom face in the channel shell, and the outlet collecting piece is located on the top face in the channel shell. The flow velocity detector at the inlet end can detect the velocity of water flowing into the channel shell, when the flow velocity exceeds a threshold value, the inflator pump is automatically triggered to enable the elastic expansion shell to form a conical contraction structure, the elastic expansion shell is matched to effectively slow down the flow velocity to a suitable range, and definition and integrity of image acquisition are ensured.

The application relates to the technical field of fish protection, in particular to a biomimetic fishway multi-parameter optimization method considering fishway environment and water quality requirements, which comprises the following steps: obtaining the dissolved oxygen concentration in the fishway water body. According to the difference between the dissolved oxygen concentration and the preset reference oxygen demand, the guide water temperature for guiding fish to bypass the high flow speed area is determined. Based on a global optimization model of graph theory, the positions of multiple to-be-guided fish group clusters and the positions of multiple adjustable guide nodes are processed to determine the optimal matching relationship between the to-be-guided fish group clusters and the adjustable guide nodes. According to the optimal matching relationship, the corresponding adjustable guide node is controlled to output the guide fluid with the guide water temperature. The application provides a method for coordinating the conflict between the oxygenation operation and the fish migration.

The invention relates to the technical field of fish migration dam-passing facilities, in particular to a double-channel type ascending fishway which comprises a vertically-arranged supporting column, and a fishway body is fixedly connected to the outer side of the supporting column in a spiral surrounding mode. The top end of the fishway is connected with a buffer pool which is communicated with an upstream river channel, and the bottom end of the fishway is communicated with a downstream river channel; a partition plate is arranged on the inner side of the fishway in the length direction and divides the fishway into an inner part and an outer part, the inner side is a high-speed fishway, and the outer side is a low-speed fishway. A plurality of fish passing openings are formed in the partition plate at equal intervals, water guide plates extending into the high-speed fishway are arranged at the fish passing openings, and a plurality of water baffles are arranged in the low-speed fishway in a staggered mode; the double-channel type fishway is arranged according to the water flow velocity difference between the inner side and the outer side of the spiral fishway, the water flow velocities in the two fishways are different, and therefore the fishway can be suitable for more complex river ecology, and a more suitable upward dam passing channel is provided for various fish schools with different habits.

The invention discloses a suspended ecological silt-removing fish box, which comprises an anchor, a traction chain, a suspended box body and a protection plate. The suspended box body is connected to the top of the anchor through the traction chain, and the protection plate is arranged outside the suspended box body. A fish migration channel and an inner recessed cavity are arranged between the suspended box body and the protection plate. The suspended box body is driven by the thrust on the upper layer of the water area to agitate the silt at the bottom of the water area, so that the water flow carries away part of the silt, and the native cave-dwelling fish is protected. The structure is simple and firm.

The invention relates to the technical field of fish migration in water conservancy and hydropower engineering, in particular to a framed bent supporting structure for fishway engineering of a hydropower station, which comprises an engineering foundation part for providing a supporting foundation; the fishway part comprises a fishway side wall which is arranged above the engineering foundation part and used for forming a fishway aqueduct, and the fishway aqueduct is used for providing a fishway with the height increased during fish migration; the hydropower station fishway project adopts a framed bent supporting structure, and is suitable for construction of a hydropower station fishway in a mountainous area with wide land acquisition range, large slope excavation volume, high environmental protection requirement and strict ecological red line control; the occupied area of a project and the slope excavation scale are effectively reduced, the water and soil loss phenomenon is relieved, and the ecological environment of a sensitive area can be effectively protected; the scheme of proper slope ratio and circling design is adopted, the elevation of the fishway is increased through the framed bent supporting structure, the continuity and comfort of a fish migration channel are facilitated, and the requirement for fish upstream migration in the high-altitude mountainous area can be met.

The invention relates to a multi-modal underwater bionic fish monitoring system and method based on acousto-optic magnetic fusion. The system is characterized in that data acquired by a bionic fish device is directly transmitted to an edge calculation processing unit; and preprocessing the data, issuing an instruction and uploading the data to the cloud cooperative control platform. The method comprises the steps that after receiving data, a cloud cooperative control platform judges whether the data is normal or not, if the data is normal, LSTM is directly called to complement time sequence data to generate a three-dimensional ecological thermodynamic diagram, if the data is abnormal, a fish shoal migration mode is associated to generate the three-dimensional ecological thermodynamic diagram, and then a bionic fish operation optimization path is generated through calculation; and finally, an instruction is issued to the bionic fish device. The invention realizes low-influence and high-efficiency water body monitoring.

The invention relates to the field of fish migration channels, and discloses a fishway inlet water replenishing pool structure which comprises a water replenishing pool, a water replenishing channel arranged on one side of the water replenishing pool and a stilling pool arranged between the water replenishing pool and the water replenishing channel, and further comprises a filtering assembly arranged in the water replenishing pool and used for filtering water in the stilling pool. The filter is used for filtering a water source flowing into the water replenishing tank; the desilting assembly is arranged in the water supplementing pool and used for cleaning sludge in the water supplementing pool; the ultrasonic liquid level meter is arranged above the water supplementing pool and used for monitoring the water level and the sludge amount in the water supplementing pool, a water supplementing source can be effectively filtered, impurities, suspended solids and pollutants in water can be removed, the operation state of the water supplementing pool can be known in time, an accurate basis is provided for reasonably adjusting water flow and arranging desilting work, and the water supplementing pool is convenient to use. And the desilting assembly can automatically clean silt in the water supplementing pool, the labor burden of workers is relieved, and the desilting work efficiency is improved.

The application discloses a navigation facility. The navigation facility comprises a deep navigation channel and a semi-submersible floating ship loader. The deep navigation channel is formed at the bottom of a normal navigation channel and passes through a bridge crossing a navigation channel. The semi-submersible floating ship loader is configured to float in the deep navigation channel with a controllable draught and is used for carrying a ship through the bridge crossing the navigation channel. The technical scheme provided by the application can solve the navigation requirement under the condition that the height of an existing bridge is limited, and also meets the requirements of not affecting the normal use of the bridge, river flood discharge in flood season, fish migration and the like.

The utility model relates to the technical field of fish breeding, in particular to a groove well type fish ladder convenient for fish to trace, which is characterized in that circulating pipe groups are respectively and fixedly arranged on a plurality of stairways, a plurality of reducing pipes are connected in the circulating pipe groups through a convenient dismounting mechanism, water baffles are respectively and fixedly arranged at the upper parts of the circulating pipe groups, and protective baffles are arranged on the front side and the rear side of each water baffle. The protective baffle is fixedly arranged on the circulating pipe set, the partition plates are fixedly arranged on the stairways respectively, and the circulating pipe set is connected with the side walls of the partition plates, so that fishes can enjoy wheezing in the flow tracing process, the fishes do not need to pass through the fish ladder in a flying mode, and the flow tracing of the fishes is more convenient and labor-saving.

This invention discloses a submerged fish lock, a type of fish passage facility. It employs a culvert-type structure with pressurized flow, creating a continuous, stable, low-velocity water flow within the lock through the rational arrangement of gates and the design of a drainage system, ultimately enabling fish passage. The fish passage chamber is equipped with, from upstream to downstream, an upstream maintenance gate, a first working gate, a second working gate, and a downstream maintenance gate. A ventilation hole is provided in the fish passage chamber between the upstream maintenance gate and the first working gate. An inlet, drainage equipment, and pipes are provided in the fish passage chamber between the first and second working gates. The beneficial effects of this invention are: protecting fish migration and restoring the ecological balance of the river.

The application discloses a kind of bionic fish ladder microfluidic chip and integrated cell sorting and drug screening platform thereof.The fish ladder microfluidic chip adopts fish ladder-shaped main channel of tapering-dilating alternation, internally set micro barrier array with gap gradually decreasing, and vortex stop zone is formed in dilating section, overall imitates the ladder-ramp pool structure of "fish ladder" in fish migration channel.Based on cell deformation difference, it realizes label-free, mild, high-throughput sorting;After sorting, cell directly flows into downstream 3D culture chamber, can in situ carry out drug screening.The application integrates sorting, screening and culture in single chip, avoids damage and state change caused by cell transfer in traditional method.The "fish ladder microfluidic" concept defined in the application has clear bionic source and identifiable structural characteristics, and can be used as an iconic term in the technical field.Especially suitable for efficient screening of active ingredients in complex system of traditional Chinese medicine and tumor stem cell research.

The utility model discloses a portable fish migration GPS positioning device with self-supply kinetic energy, which comprises a head elastic ring belt and a tail elastic ring belt, the head elastic ring belt and the tail elastic ring belt are sleeved on the surface of a fish body, the head elastic ring belt is close to the position of a front fish fin, and the tail elastic ring belt is close to the position of a rear fish fin. An elastic strap is arranged between the head elastic girdle and the tail elastic girdle, and a GPS positioning device, a miniature storage battery and a miniature water flow power generation device are arranged on the elastic strap; the utility model solves the problems that the GPS positioning device added on the migratory fish at present causes permanent physiological trauma to the migratory fish, and the GPS positioning label of the migratory fish cannot monitor the long-distance, large-span and long-term fish trajectory.

The invention provides floating type fishway equipment and a fishway system, and relates to the technical field of water conservancy and hydropower engineering facilities, the floating type fishway equipment comprises a floating type fishway main body, a main drainage device, a connecting device and a telescopic connecting piece, the floating type fishway main body comprises a fish tank and a water tank device, the fish tank is installed on the upper portion of the water tank device, and the main drainage device is installed on the water tank device; the water tank device comprises a plurality of water ballast tanks arranged in the extending direction of the fish tank. The floating fishway main body is arranged at the downstream of the fixed fishway; the main drainage device is respectively communicated with the plurality of water ballast spaces and is used for selectively filling and draining water into the water ballast spaces; the connecting device is used for movably connecting the floating fishway main body with the fixed fishway; one end of the telescopic connecting piece is communicated with one end of the fish tank, and the other end of the telescopic connecting piece is communicated with the fixed fishway. The floating fishway equipment can dynamically adapt to the continuous change of the water level so as to ensure that a fish migration channel is always smooth.

The invention discloses a method and a system for identifying a problem river reach after fishes pass through a dam, and belongs to the technical field of aquatic ecology monitoring. According to the method, behavior data after fishes pass through a dam and river channel environment data are collected, a standardized data set is constructed through preprocessing, five types of core features such as migration path deviation degree, dead time and water flow velocity are extracted, a recognition model is constructed by adopting a lightweight deep neural network, model parameters are optimized through adaptive learning rate adjustment and cross validation, and the fish migration path is identified. And determining a preset threshold value based on the ROC curve, and finally judging the problem river reach through the abnormal probability value. According to the method, automatic and high-precision recognition of the problem river reach is achieved, the defects that a traditional method depends on manual patrol, is low in efficiency and high in subjectivity are overcome, a scientific basis is provided for ecological restoration of the fish migration channel, and good practicability and popularization value are achieved.

The invention discloses a fishway structure, and relates to the technical field of fishways, the fishway structure comprises a fishway and a connecting structure, the fishway is detachably connected with a side pier, an upstream vertical quay wall and a downstream vertical quay wall of a rubber dam through the connecting structure, and the fishway is a partition plate vertical seam type fishway. The invention aims to provide the fishway structure, the fishway structure can be mounted at positions such as a rubber dam without a fishway, and the problem of fish migration is solved.

This invention provides a fishway migratory ramp structure for *Sinocyclocheilus fasciatus* suitable for small, slow-flowing rivers, relating to the field of fishway engineering technology. It includes: a water-blocking support, a movable water-blocking section, a position detection section, a linear drive section, and a monitoring and cleaning section. The movable water-blocking section is arranged in a row, and this row is installed on the water-blocking support. The position detection section is also arranged in a row, and this row is installed on the movable water-blocking section. The linear drive section is installed on the top of the water-blocking support. The monitoring and cleaning section is installed on the linear drive section. A control box is installed on the front side of the water-blocking support. This invention achieves a relatively shallow water depth when all rectangular drainage holes are in the lower half, and a relatively deep water depth when all rectangular drainage holes are in the upper half. It solves the problem of the inconvenience of workers adjusting the water flow depth using the water-blocking stones, which increases the difficulty of adjusting the water depth.

The invention discloses a fish migration channel restoration scene simulation and optimization decision method, and relates to the technical field of fish migration channel restoration and simulation optimization, and the method comprises the steps: obtaining a target fish migration season time interval, and constructing a discrete departure time set; calculating the accumulated migration time of each dam in combination with the river reach length, the water flow and the water cross-sectional area, and performing environmental suitability and time passing judgment on the discrete departure time based on the river reach water temperature and the fish passing facility operation time range to obtain a prefix time overlap ratio and a dam bottleneck degree index; the method comprises the following steps: constructing a plurality of repair scenes, performing translation adjustment on a running time range of a fish passing facility of a bottleneck dam, calculating a time overlap ratio of each scene, and selecting the scene with the maximum time overlap ratio as an optimal repair scene. According to the invention, the overall through capability of the fish migration channel in the stepped river reach can be improved.

The invention belongs to the field of mariculture equipment, and relates to a guide type artificial ecological fish reef for migratory fishes, which comprises a fish reef body, the fish reef body is of a hollow triangular pyramid structure with an upward conical tip, the bottom of the fish reef body is of an open structure, and the fish reef body is formed by splicing a triangular pyramid and a plurality of triangular prisms through metal connecting pieces; the three side faces of the triangular pyramid and the three side faces of each triangular pyramid frustum are each provided with a plurality of triangular hollowed-out holes, and the porosity of the side faces of the fish reef body is lower when the side faces of the fish reef body are closer to the upper layer. A plurality of supporting components used for supporting the fish reef body on the seabed are arranged at the bottom of the fish reef body. The artificial ecological fish reef adopts a triangular pyramid type structural design, combines a guiding function and an ecological function, forms a stable hydrodynamic condition in ocean current, guides migratory fish clusters, realizes artificial controllable accurate control of a demersal and migratory fish migration path, is suitable for deep and far sea water areas, aims to promote migratory fish resource recovery, and has a good application prospect. And the sustainability of fishery resource utilization is improved.

The utility model discloses a new dam apron in the technical field of water conservancy, including dam body, the water flow below of dam body is provided with apron main slope body, the both sides of apron main slope body are provided with the side waterfalls of a plurality of layers of layerwise under superimposed, the middle part of apron main slope body is provided with the intermediate waterfalls of a plurality of layers of layerwise downward superimposed, is provided with the buffer slope between intermediate waterfalls and below main river course, the left and right sides of apron main slope body all are provided with landscape footpath, the fishway is repaired between apron main slope body and one side bank, and the fishway communicates the water flow of dam body upstream and apron main slope body downstream. The utility model discloses form transverse turbulence through side dragon scale shape waterfalls, and the impact force of dispersion side wing water flow is protected bank base, and the central wave shape waterfalls longitudinal ladder type broken main stream, and cooperate end buffer slope energy dissipation. Special fishway connects dam body upstream and downstream, and guarantees fish migration channel, and restores aquatic ecological chain.

The utility model relates to the technical field of fish ecology, in particular to a migration simulation device for aquaculture, which comprises a swimming channel, a fixed step is fixedly connected to the bottom of one end of the swimming channel, a plurality of groups of movable steps are equidistantly mounted on one side of the fixed step, and nozzles for spraying water are mounted on two sides of the fixed step and the movable steps. The bottom of the fixed step and the bottom of the movable step are connected with an adjusting plate in the runner through a connecting plate and a connecting rod, the connecting rod corresponding to the movable step is slidably connected with the adjusting plate, a T-shaped sliding groove is formed in the inner wall of the runner, the two sides of the fixed step and the two sides of the movable step are matched with the T-shaped sliding groove in a sliding mode through T-shaped sliding blocks, and the spray head is fixed to the tops of the T-shaped sliding blocks. The migration simulation device for aquaculture has height adjustability, the fish ladder structure can be adjusted according to different fish migration habits, the natural water flow environment is accurately simulated, and the requirement for fish migration environment simulation in aquaculture is greatly met.

The invention belongs to the technical field of water conservancy and hydropower engineering fish passing devices, and discloses a fish guiding device based on a bionic fishway and a control method thereof.The fish guiding device comprises a bionic fishway body and an acousto-optic fish luring assembly and further comprises cleaning mechanisms arranged on the two sides of the interior of the bionic fishway body; the cleaning mechanism comprises worm wheels rotationally connected to the two sides of the interior of the bionic fishway body, and a pushing plate is fixedly installed on one side of each worm wheel. A first connecting rod and a cleaning plate can be driven by a moving ring to reciprocate, bristles, close to one side of the acousto-optic fish luring assembly, of the cleaning plate can make contact with the acousto-optic fish luring assembly in the moving process of the cleaning plate, and the acousto-optic fish luring assembly is cleaned through movement of the cleaning plate; and finally, the acousto-optic fish luring assembly is cleaned by a cleaning plate through a driving motor I, so that the acousto-optic fish luring assembly can stably guide the fish migration, and the reliability of the whole fish migration guide is improved.

The utility model relates to the field of hydraulic engineering facilities, concretely relates to fishway (1) and barrage, wherein the fishway includes at least partly setting in the slope section on the stilling basin (3) downstream of the water gate a plurality of sections of the return section (11) connected in turn, and the slope of each return section is less than the slope of the slope section, to form the fish migration channel that the return ground extends from the bottom end of the stilling basin to the lock chamber of the water gate, and the bottom end of the fish migration channel is provided with the fishway entrance (13), and the top end is provided with the fishway exit (14) that communicates with the lock chamber of the water gate, when using, the fish in the downstream is attracted by the water flow that flows out in the fishway and is suitable for the migration, to enter the fishway and enter the lock chamber of the stilling basin upstream against the current, because the fishway return ground extends to the lock chamber of the water gate, the form of segmented climb relieves the height difference of the stilling basin, makes the water flow speed in the fishway lower, thereby is suitable for the migration of fish, makes fish be able to pass through the stilling basin and the water gate by the fishway.