59 results about "Swimming speed" patented technology

The invention discloses a line-driven bionic flexible robotic fish and a using method thereof. The line-driven bionic flexible robotic fish comprises a rigid fish head, and a power source and a control module are arranged in the rigid fish head; the head end of the rigid fish body is connected with the rigid fish head; the flexible fish tail is connected with the rigid fish body, and the flexible fish tail comprises an elastic fish tail spine, a fish tail supporting joint, a tension spring and a flexible fish tail skin; the flexible fishtail driving module is arranged in the rigid fish body; wherein the flexible fishtail is driven by a single motor in cooperation with a stay wire, an intermuscular bone of a fish is simulated through a fishtail supporting joint, the swinging posture of the flexible fishtail is restrained while the driving stay wire is supported, and a nonlinear module is formed through a tension spring and an elastic fishtail spine. The intelligent flexible bionic robotic fish has the advantages that the energy consumption is reduced, and the swimming speed and the swimming efficiency can be improved.

The invention discloses a fish school toxicity behavior analysis method and system based on deep learning. The analysis method comprises the following steps: acquiring to-be-analyzed image data; the to-be-analyzed image data is input into a fish school recognition model, a fish school monitoring index is obtained, the fish school recognition model is obtained through training of a training set, and the training set is marked image data containing a fish school; and according to the fish school monitoring index, obtaining the early warning grade of the comprehensive toxicity of the fish school. The invention provides a fish school toxicity behavior analysis method and system based on deep learning, which has the functions of fish school detection, tracking and behavior recognition, and can automatically calculate the swimming speed, swimming distance and behavior classification index of a fish school under a fixed sequence image. And then the specific fish school swimming ability is combined with the abstract fish school behavior index, so that the function of accurately calculating the fish school water quality toxicity early warning level under the fixed sequence image is realized.

The invention relates to the technical field of data processing, and discloses a hydropower station fish gathering system inlet flow field adaptability optimization method and system. The method comprises the following steps: grading target fishes according to swimming speed and body length, setting a flow velocity adaptation threshold value, monitoring a flow field through an acoustic Doppler current meter, fusing data by using a Kalman filtering algorithm, calculating a fish rheotaxis index, and carrying out matching analysis to evaluate the adaptability of the flow field, according to the evaluation result, the flow guide pier and the microbubble curtain are controlled to conduct multi-stage linkage regulation and control, and a fuzzy PID control algorithm is adopted to achieve self-adaptive flow field control with the fish hydrotaxis index as a feedback signal. The problem that flow field optimization lacks fish behavior response feedback and multi-device coordination control in the prior art is solved, and the biological adaptability and the regulation and control precision of the inlet flow field of the fish gathering system are improved.

The invention discloses a fishway hydraulic power and fishway structure design method and related equipment, and the method comprises the steps: obtaining swimming capability parameters of each target fish species in a target water area, the swimming capability parameters comprising an induction flow rate, a critical swimming speed and an outbreak swimming speed; selecting the target fingerling with the minimum critical swimming speed as a limited fingerling; according to the critical swimming speed corresponding to the limited fingerling, calculating a first energy consumption rate of swimming of the limited fingerling at the first hydraulic flow speed; according to the first energy consumption rate, hydraulic function partitions and space sequence layout of the fishway are determined; and determining fishway hydraulic parameters according to the induction flow velocity of each target fingerling and the critical swimming speed and the outbreak swimming speed of the limited fingerling. According to the fishway, inclusive passing of the fishway to multiple species can be achieved, the structural design of the fishway can adapt to the natural behavior rhythm of fishes, the overall energy consumption of dam passing of fish schools is remarkably reduced, then the ecological efficiency of the fishway is improved, and the fishway can be widely applied to the technical field of fishway design.

The invention relates to the technical field of medicines, and provides a method for establishing a zebra fish fatigue model in order to better simulate the fatigue state of modern people. And forcing the zebra fish to continuously move through a magnetic stirring device and generating a fatigue state by noise stimulation so as to establish a fatigue model. The total movement distance, the swimming speed and the swimming track are used as behavior analysis indexes, the lactic acid content is used as a biochemical detection index, the atp2a2b gene expression quantity is used as a gene detection index, and compared with normally-treated zebrafish and zebrafish treated by Chinese traumatic injury pills, the reliability of the model is verified in multiple dimensions. The method is easy and convenient to operate, low in cost and suitable for fatigue mechanism research and anti-fatigue product development.

Embodiments of footwear to optimize propulsion while swimming in the water and walking on land, in particular, amphibious footwear capable of duty on land and in the water as well as versions that are optimized for predominantly use in the water for swimming. The exoskeleton amphibious footwear reduces metabolic demand of walking and swimming while also improving gait speed and swim speed. This is accomplished by assisting plantar flexion during land mode, and assisting dorsiflexion in water mode.

The utility model relates to the technical field of fishery breeding equipment, and discloses a touch type bait feeder convenient for feeding, which comprises a suspension block, a triggering quantitative feeding part and a positioning induction triggering part, and a suspension ring is sleeved on the outer wall of the suspension block. Through cooperation of the mounting block, the take-up wheel, the connecting line and the positioning anchor, the feeder can be positioned at a specific position in a fishpond, the feeding position of the feeder can be set in advance according to distribution habits of fish schools and water quality difference areas in large-scale fishpond cultivation, the ultrasonic fish school detector plays a key role, and the feeding effect of the feeder is improved. The dynamic states of fish schools around the feeder, including the number of the fish schools, the distance from the feeder and the swimming speed of the fish schools, can be monitored in real time, and when the ultrasonic fish school detector detects that a large number of fish schools are close to the feeder and the density of the fish schools exceeds a preset threshold value, a signal is transmitted to the controller; and the controller controls the stirring motor to start according to a signal received by the controller, and quantitative feeding is carried out.

The invention provides a fry adaptive domestication system and method based on multidirectional flow impact exercise, and relates to the technical field of fishery breeding, the system comprises three-section domestication pool bodies, the domestication pool bodies are detachably connected through flange plates, the bottom of each domestication pool body is fixedly connected with a supporting column, the upper portion of each supporting column is fixedly connected with a supporting seat, and the supporting seat is fixedly connected with the bottom of the corresponding domestication pool body. A motor is arranged on the upper portion of the supporting seat, a third bevel gear is fixed to the output end of the motor, and a connecting assembly facing the side wall of the domestication pool body in the radial direction is meshed with the third bevel gear. The invention provides a multi-directional flow impact training structure, which enables the fry to swim back and forth, turn and avoid and the like in radial, annular and spiral flow, the caudal peduncle muscle fiber density is improved by 20-30%, the swimming speed is improved by 40% compared with that of the traditional domesticated fry, the anti-countercurrent ability intensified training in the three-dimensional space of the fry is realized, and the endurance, explosive power and turning flexibility of the fry are improved in a balanced manner.

The invention relates to a fish autonomous swimming trajectory prediction method. The method comprises the following steps: acquiring time-varying hydraulic parameter information of each position of a flow field; the average value and standard deviation of the body length, the swimming capacity and the preferred hydraulic parameters of the fish are determined, the preference weight values of the fish for the various hydraulic parameters are analyzed, and the initial position coordinates, the initial swimming speed and the initial swimming direction of the fish are drawn up; determining the radius of a fish body induction coil according to the body length of the fish, and setting the tending direction of the fish in the next step; calculating the preference probability of fishes at all positions in the induction coil range for each hydraulic parameter; calculating comprehensive preference values of fishes at all positions for all hydraulic parameters, and determining the advancing direction of the fishes; setting fish swimming speed and time step length, and determining the position of the fish in the next step; and updating the position coordinates of the fish until the fish appears outside the flow field computational domain or the iteration step number reaches a preset value, and counting the position coordinates of the fish at all moments, namely obtaining the advancing track of the fish. The method has the advantages that the advancing tracks of fishes in various flow field environments can be predicted.

The invention relates to a shape rigidity variable tail fin and a bionic robotic fish and a motion mode thereof, and belongs to the technical field of underwater robot application. The device specifically comprises a tail handle center rod (35), a tail handle side rod (36), a tail fin center rod (49) and the like. The two sides of the tail fin center rod (49) are provided with single-side composite parallelogram mechanisms; a variable-stiffness regulation and control area of the tail fin is arranged between the tail fin center rod (49) and the tail handle center rod (35), and a first sliding block (37) is arranged between the tail fin center rod (49) and the tail handle center rod (35); the sliding of the first sliding block (37) can change the coverage range of the first sliding block (37) on a variable stiffness regulation and control area on one hand, and drives the single-side composite parallelogram mechanism to generate cooperative deformation on the other hand; the shape and rigidity of the tail fin of the robotic fish are cooperatively controlled, so that the swimming speed and the propelling efficiency of the robotic fish are effectively improved.

The invention relates to the technical field of marine fishing, and discloses a marine cephalopod fishing device and method based on lamplight trapping, the device comprises a light source system, a behavior monitoring system, a fishing device and a device main body framework, the light source system monitors seawater transparency, seawater flow velocity and illumination intensity in real time through a sensor array; according to the method, the initial lamplight parameters are acquired according to real-time data of a sensor, the initial lamplight parameters are optimized in combination with historical fishing data, and meanwhile, the phototaxis index, the swimming speed and the gathering degree of the cephalopods are monitored in real time through a behavior monitoring system. Based on the data, the equipment can dynamically adjust a light trapping strategy, in this way, the equipment can keep the best trapping effect in different sea areas and environments, and the fishing efficiency is remarkably improved.

The invention provides a method for acquiring autonomous propulsion performance of a flexible deformable body based on a resistance correction surface element method. The method comprises the following steps: (1) determining physical characteristics and initial parameters of the flexible deformable body and initial conditions and flow parameters of fluid; (2) carrying out direct numerical simulation on the flexible deformable body by using a classical surface element method to obtain the fluid pressure intensity borne by the object surface; (3) calculating resistance compensation applied to the center of mass of the flexible deformation body through an equivalent resistance model; (4) calculating the autonomous forward swimming speed when the flexible deformable body stably swims through the balance of the pressure and the equivalent resistance borne by the flexible deformable body in the swimming process; and (5) obtaining the hydrodynamic power and efficiency of the flexible deformable body according to the stress and the cruise speed of each part of the flexible deformable body. According to the method, the rapidity and convenience of the surface element method in calculating the fluid-solid coupling problem can be kept, and meanwhile, the error of the classical surface element method in practical application is remarkably improved.

The application relates to the technical field of aquatic product monitoring, and discloses a large yellow croaker swimming speed monitoring method and system based on target detection, which comprises the following steps: acquiring a to-be-monitored image of a target water area, real-time environmental flow rate data and real-time water body turbidity data of the target water area; performing target detection on the to-be-monitored image to obtain coordinate data of the large yellow croaker; performing linkage verification on the coordinate data to obtain verified coordinate data; determining real-time posture features of the large yellow croaker according to the verified coordinate data; optimizing the real-time posture features through a flow rate phase joint mechanism to obtain optimized posture features; and constructing a posture fluid coupling model according to the optimized posture features and the real-time environmental flow rate data to determine the swimming speed of the large yellow croaker. The application fully considers the influence of the posture of the large yellow croaker and the environment, and combines the biomechanical features to realize accurate calculation of the real swimming speed of the large yellow croaker.

The invention discloses a shellfish larva vitality measuring device, and relates to the field of marine bivalve shellfish larva behavioristics, a measuring device is arranged in a heat preservation device, swimming tracks and swimming speeds of shellfish larvae in different temperature environments are simulated through the heat preservation device, and the measuring device comprises a measuring chamber, a camera and a measuring scale, a measuring ruler is arranged on the inner side wall of the measuring chamber, the camera faces the measuring chamber and is arranged on the opposite side of the measuring ruler, the camera records the motion trail of the shellfish larvae in the measuring chamber in the background of the measuring ruler, and the clearness of the motion trail of the shellfish larvae in the video is increased through irradiation of the light source. The swimming speed of the shellfish larvae is calculated by combining a measuring scale in a video, so that the accuracy of shellfish larva vitality evaluation is improved; meanwhile, the invention further discloses a determination method applying the shellfish larva vitality determination device, and the vitality strength of the shellfish larvae under the actual condition is judged.

The application discloses a bionic fish structure with foldable and variable rigidity adjustment functions, and belongs to the technical field of bionic fish structures. In order to solve the problems of high energy loss rate, slow swimming speed, poor stability at high speed, and the fact that a large amount of space cannot be left in the fish head for bearing, the application comprises a fish head unit, a fish body unit and a foldable tail fin, the fish head unit and the foldable tail fin are arranged at two ends of the fish body unit respectively, the fish body unit comprises an outer skeleton, a foldable dorsal fin unit, a fish body swing unit and a fish tail variable rigidity adjustment assembly, the foldable dorsal fin unit, the fish body swing unit and the fish tail variable rigidity adjustment assembly are arranged in the outer skeleton, one end of the fish body swing unit is detachably connected with the fish head unit, the other end of the fish body swing unit extends out of the tail end of the outer skeleton and is detachably connected with the foldable tail fin, the foldable dorsal fin unit is located above the fish body swing unit, the top of the foldable dorsal fin unit penetrates through the outer skeleton and extends above the outer skeleton, and the fish tail variable rigidity adjustment assembly is located above the fish body swing unit and in the inner part of the outer skeleton. The application is used as a bionic fish structure for underwater detection.

The application relates to the technical field of image processing, and discloses a fish school target tracking and swimming speed calculation method based on a sonar image, which comprises the following steps: acquiring a sonar video set and a parameter set collected by a sonar sensor array, performing isochronous interval frame processing to obtain a first video frame set, performing screening and denoising to obtain a second video frame set, determining position data and fish school type data of a target fish school based on the second video frame set, the parameter set, a pre-trained identification model, performing identification frame marking on each video frame image in the second video frame set, extracting target data of the identification frame, and calculating the swimming speed of the target fish school. Through implementation of the application, from comprehensive and accurate data collection to high-quality image processing, accurate target identification and tracking are realized, and the problems that related technologies are not perfect, target loss or misjudgment is prone to occurring when multiple targets are tracked, and the demand for accurate measurement of fish school speed cannot be met are solved.

The present application belongs to the technical field of underwater bionic robot control, and particularly relates to a motion control optimization method for a flexible robotic fish, a program, a device and a storage medium. The present application first constructs a CPG network model of the flexible robotic fish based on a Hopf central pattern generator, simplifies the flexible joints of the caudal region of the flexible robotic fish into pseudo-chain models by using a pseudo-chain method, and connects adjacent pseudo-chains through pseudo-joints. The desired speed of the flexible robotic fish is obtained, the transportation cost of the flexible robotic fish is taken as an optimization target, and the control parameters corresponding to the lowest transportation cost are obtained through optimization. The present application constructs a motion control optimization method specially used for the flexible bionic robotic fish according to the characteristics of the flexible robotic fish, can effectively control and optimize most of the current flexible robotic fish, further improves the swimming speed and efficiency of the flexible robotic fish, and has a wide application prospect in the fields of underwater detection and underwater exploration.

The application discloses a four-fingered tetra intelligent net cage breeding system and method based on behavior recognition and low stress control, which comprises a flexible anti-collision light-blocking net cage module, an underwater AI behavior early warning module, a micro-bubble and sound-light soothing intervention module and a dry-free flexible transfer module. The flexible anti-collision light-blocking net cage eliminates net collision and scale shedding and visual disturbance from the physical structure, the underwater AI behavior early warning module extracts three-dimensional features of sudden change rate of swimming speed, spatial dispersion and gill cover vibration frequency to calculate a comprehensive stress index, realizes four-level grading early warning, the micro-bubble and sound-light soothing intervention module realizes targeted soothing through mute oxygenation, blue-green light and low-frequency sound waves, and the dry-free flexible transfer module realizes underwater zero-fishing transfer of fish bodies. The application improves the survival rate of four-fingered tetra by 22.6% and reduces the scale infection rate by 93.5%, solves the stress bottleneck of large-scale breeding of the four-fingered tetra and is suitable for large-scale near-shore net cage breeding of the four-fingered tetra.

A wearable device for tracking swim activities of a user is provided. The wearable device may include one or more sensors configured to generate sensor data, and based on the sensor data, the wearable device may determine swim metrics such as swim stroke count, swim stroke type, swim lap count, and swim speed. The determined swim metrics may be filtered based on one or more swim periods during which the user is likely to have been swimming. The wearable device may determine such swim periods based on the sensor data and / or the determined swim metrics.

The invention discloses a swimming speed measurement simulation display device for a swimming pool, and belongs to the technical field of swimming speed measurement, the swimming speed measurement simulation display device comprises the swimming pool, the outer wall of the swimming pool is provided with a speed measurement assembly and a timing assembly, the timing assembly is provided with a water removal assembly, one side of the swimming pool is provided with a display screen, and the speed measurement assembly comprises a mounting box. The mounting box is fixedly mounted on the side wall of the swimming pool, a first stroke groove is formed in the top surface of the mounting box, a first motor is fixedly mounted on the inner wall of the mounting box, and a power rod is rotatably mounted on the inner wall of the mounting box; according to the device, the speed measuring assembly is arranged, through the design, real-time swimming stroke capturing and speed measuring of an athlete are effectively achieved, the athlete does not need to wear any device, the speed is accurately measured, the athlete can conduct real-time comparison and interaction according to previous data or set data, the athlete is effectively helped to increase the swimming speed, and the use effect is good.

The application relates to the field of machine fish, and particularly discloses a high-speed bionic machine fish based on tail fin enhanced propulsion, which comprises a fish head bionic part, a fish body bionic part and a tail fin piece; the end of the fish body bionic part is movably connected with an open tail bone support; a crank rocker structure is arranged on the fish body bionic part; the crank rocker structure is connected with the open tail bone support; the open tail bone support is partially connected with the tail fin piece; and a tail handle side convex fin piece is arranged on the open tail bone support; the crank rocker structure is used for converting rotary motion into the reciprocating swing action of the whole body of the open tail bone support and the tail fin piece; the tail handle side convex fin piece is used for generating a backward rolling vortex and colliding with the leading edge vortex generated by the tail fin piece in the reciprocating swing process. The open tail bone support is used as the tail handle connecting structure of the machine fish to connect the tail fin piece and the fish body bionic part, so that a faster swimming speed can be obtained under the automatic swimming model of the machine fish.

The invention discloses a variable stiffness rope-driven robotic fish, which comprises a robotic fish body, a control part and an electronic function module, the robotic fish body comprises a rigid fish head part, a flexible fish skeleton and an adjustable fish tail part, the flexible fish skeleton is formed by combining a variable stiffness mechanism and a rope and is used for driving the robotic fish to swim, and the variable stiffness characteristic is provided by a spring element; a variable stiffness mechanism is matched with a rope driven by a motor to simulate the antagonism of muscles when fishes swim in nature, so that the swim speed and efficiency are improved to a certain extent, and tail fins of different models can be detached and replaced at the tail part of the fish; the control part, the electronic function module and the power supply are all arranged in the cavity of the fish head part; the robotic fish is controlled by an infrared remote control open loop, can realize swinging of the fish tail at different frequencies, can be used for researching optimization of a variable stiffness mechanism, and is expected to be used in the fields of underwater exploration, environment detection and the like after being carried with other detection modules.

The invention belongs to the technical field of underwater bionic robot control, and particularly relates to a motion control optimization method for a flexible robotic fish, a program, equipment and a storage medium. The method comprises the following steps: firstly, constructing a CPG network model of the flexible robotic fish based on a Hopf central pattern generator, simplifying flexible joints of a fishtail area of the flexible robotic fish into pseudo-chain models by using a pseudo-chain method, and connecting adjacent pseudo-chains through the pseudo-joints; and obtaining the expected speed of the flexible robotic fish, taking the transportation cost of the flexible robotic fish as an optimization target, and obtaining a control parameter corresponding to the lowest transportation cost through optimization. According to the characteristics of the flexible robotic fish, the motion control optimization method special for the flexible bionic robotic fish is constructed, control optimization can be effectively carried out on most flexible robotic fishes at present, the swimming speed and efficiency of the flexible robotic fish are further improved, and the motion control optimization method has wide application prospects in the fields of underwater detection, underwater exploration and the like.

The utility model discloses a swimming auxiliary device capable of increasing swimming speed, which comprises a body connecting piece used for being connected and bound with a body part, and further comprises a limiting head of a disc structure, a plurality of hinge seats and a plurality of umbrella ribs are arranged below the limiting head, and the limiting head is connected with the body connecting piece. The plurality of hinge seats and the plurality of umbrella ribs are radially and circumferentially distributed by taking the central axis of the limiting head as a center, and the distribution directions of the hinge seats and the umbrella ribs are in one-to-one correspondence; a rotating shaft is arranged at the inner end of each umbrella rib, and then the umbrella ribs are rotationally arranged on the corresponding hinge seats through the rotating shafts and are unfolded upwards or folded downwards by taking the rotating shafts as rotating points; when the umbrella ribs are opened upwards and abut against the lower edge of the limiting head, the opening angle of the umbrella ribs is the largest. And an umbrella film is fixedly connected between the adjacent umbrella ribs. The limiting heads are arranged above the umbrella ribs, a traditional complex tensile rope structure is abandoned, the overall structure is simplified, manufacturing difficulty and cost are reduced, and the umbrella has the advantages of being simple and firm in structure and easy to maintain.

The utility model relates to the technical field of water sports equipment, and particularly discloses a flipper which comprises a shoe body and a paddle body. The shoe body comprises a vamp on the upper portion, a toe cap on the front side and a sole at the bottom, and the vamp, the toe cap and the sole jointly define a shoe cavity capable of containing the foot. One end of the paddle body is connected with the vamp, the other end of the paddle body extends outwards, the other end of the paddle body is bent towards one side of the sole at a certain angle, and a paddling cavity is formed in the connecting position of the paddle body and the toe cap; a reset reinforcing rib is arranged in the paddling cavity, and the shoe head and the paddle body are connected through the reset reinforcing rib. According to the utility model, the paddle body extends outwards and is bent towards one side of the sole at a certain angle, so that water flow can be grabbed more effectively, and larger thrust can be generated in the backward paddling process. Therefore, the swimming speed of the user can be increased in breaststroke or similar swimming actions, and physical exhaustion is reduced.

According to the underwater bionic robot, through cooperation of three modularized propeller assemblies, when rapid swimming is needed in an emergency situation, three propellers of the robot can be used for driving in the same direction at the same time, and the swimming speed is increased; when a more complex scene task needs to be executed, the robot can freely and rapidly switch the swimming mode in multiple modes such as in-situ turning, in-situ rolling, omnidirectional moving and hovering, the passing ability problem of an underwater narrow and complex space is solved, the robot can rapidly swim or more flexible swimming scenes, and the requirement of the robot for the narrow and small space is met; on the other hand, a flexible film pressure sensor is attached to the surface of the flexible fin and used for sensing bending deformation of the flexible fin, so that whether the flexible fin breaks down or collides or not is sensed, the robot makes a decision, and the fault sensing and autonomous operation capacity of the robot is improved.

The invention discloses a multi-source data fusion-based circulating water culture water quality accurate regulation and control method, and belongs to the technical field of aquaculture. The method comprises the following steps: synchronously acquiring water quality parameters, fish school images and water body particulate matter multi-dimensional data through an acquisition system consisting of a water quality sensor, an underwater high-definition camera and a water body particulate matter sensor; a dynamic association model is constructed to fuse multi-source data, a deep learning image recognition algorithm is introduced to quantify the fish school food grabbing intensity and swimming speed, early warning of fish school stress is achieved, meanwhile, a time sequence prediction algorithm is adopted to construct a water quality prediction model, and real-time and historical data and a feeding plan are fused to predict the key water quality parameter change trend in several hours in the future; on the basis of the prediction result and the early warning signal, operating parameters of the aerator and the pH adjusting pump are regulated and controlled in real time, and a feeding strategy is dynamically optimized. Cooperative monitoring and advanced regulation and control of water quality and fish shoal behaviors are achieved, the culture water quality is effectively stabilized, fish shoal stress damage is reduced, and the benefits of circulating water culture are improved.

The present invention discloses a method, device, equipment and storage medium for adjusting sports training in a jet pool, the method comprising: obtaining a swimming posture image of a trainee in a jet pool captured by a camera, and obtaining the swimming speed and heart rate of the trainee detected by a wearable device; extracting swimming posture features from the swimming posture image to obtain swimming posture features, and extracting features from the swimming speed and heart rate to obtain swimming speed features and heart rate features; performing multimodal feature fusion on the swimming posture features, swimming speed features and heart rate features to obtain fusion features; analyzing the fusion features using a reward-based reinforcement learning algorithm to obtain a water jet mode and water jet speed currently suitable for the training of the trainee; and controlling the water jet operation of the jet pool according to the water jet mode and the water jet speed. The present invention can improve the training effect and training experience of the trainee in the jet pool.

An ultrasonic device (1) including an ultrasonic transducer (10), a fish echo tracking module (32), a fish speed calculation module (33), an ultrasound incidence angle calculation module (34), and an angle adjustment module (35) is disclosed. The ultrasonic transducer sequentially transmits a plurality of transmission waves toward a fish and generates an echo signal for each of the plurality of transmission waves. The fish echo tracking module tracks in time an echo of the fish from the echo signals. The fish speed calculation module calculates a swimming speed of the tracked fish from the tracked echoes of the fish. The ultrasound incidence angle calculation module calculates an ultrasound incidence angle of the plurality of transmission waves on the tracked fish based on a position of the fish relative to the ultrasonic transducer. The angle adjustment module adjusts the ultrasound incidence angle based on the swimming speed of the fish.

A method for testing the maximum swimming ability of fish, comprising the following steps: Step 1: Conduct a fish release experiment using an open flume device; Step 2: Obtain the swimming behavior of fish and the corresponding time under different factor conditions; Step 3: Determine the swimming speed of fish under different factor conditions in the open flume; Step 4: Establish a maximum swimming speed model of fish and a prediction model for the success rate of the maximum upstream distance of fish under different factor conditions in the open flume; the factors include the working flow rate, water temperature, and fish body length in the open flume device. The open flume device can better evaluate the maximum swimming speed of fish in a near-natural state, that is, in water flow environments with different temperatures, different body lengths, and different flow rates, under open conditions, and clarify the increase in the maximum swimming ability tested in the open flume compared to the closed environmental conditions.