220 results about "Fish species" patented technology

Disclosed is a reservoir ecological operation method integrating ecological flow process and water temperature process requirements of fish species, including: establishing a habitat model for a target fish species and deducing an ecological flow process of a lift history of the target fish species; calculating a critical spawning water temperature threshold and a critical gonadal development accumulated temperature threshold; establishing a multi-objective reservoir operation model to obtain flow process and water level after optimized reservoir operation; establishing a multi-objective reservoir ecological operation model integrating both the ecological flow process and the water temperature process, and calculating reservoir outflow water temperatures before and after the optimized reservoir operation; and calculating an improvement difference between the critical water temperature threshold and the accumulated temperature threshold of the target fish species on arrival dates after the reservoir ecological operation and those before the optimized reservoir operation.

The invention discloses a multi-wave detection and imaging system for fish schools, which relates to the field of detection and imaging of fish schools and comprises a metamaterial acoustic emission module, a self-adaptive signal receiving module, a three-dimensional point cloud generation module, an image enhancement and generation module and an intelligent decision control module. According to the multi-wave detection and imaging system for the fish school, clustering parameters can be dynamically adjusted based on the real-time fish school density, the neighborhood radius is automatically expanded in a high-density area to avoid segmentation errors, and the core point judgment threshold is reduced in a low-density area to reduce missing detection; an acoustic attenuation model is constructed in combination with water body environment parameters, emission parameters are calibrated in real time, images can be enhanced, space and time dimension features are fused, the image resolution and definition are improved, accurate recognition of multiple fish species is achieved, the fish species can be better distinguished, meanwhile, a generative network is adopted to directly convert acoustic data into visual images, and the recognition accuracy is improved. Therefore, the generated image can reflect the actual distribution condition of the fish school more truly and accurately.

The invention discloses a device and a method for intelligently investigating types and quantity of fishes. The device comprises a self-adaptive sonar detection module, a three-dimensional image acquisition module, an image preprocessing module, a fish detection module, a main body segmentation module and an identification and classification module. The sonar module is integrated with a three-frequency-band transducer, can dynamically switch frequency according to fish school depth, and realizes target tracking counting and quantity estimation in combination with an algorithm; the image acquisition module constructs a fish school three-dimensional image model by combining a depth camera with a light attenuation compensation algorithm; the preprocessing module fuses acoustic and optical features and expands a data set; the detection and segmentation module is used for accurately positioning fishes and removing impurities; the identification and classification module realizes type identification based on transfer learning and supports incremental learning of new fingerlings. According to the method, through cooperation of multiple modules, the problems of insufficient detection precision, poor image quality and the like in traditional investigation are solved, efficient and accurate investigation of fish species and quantity is realized, and technical support is provided for fishery resource management and ecological protection.

The present invention belongs to the ecological field and provides a reservoir ecological regulation method that meets the requirements of fish spawning occurrence and fish egg density, including: obtaining the natural reproduction characteristic information and habitat information of fish species that produce drifting eggs in the regulated target river section, and determining the regulated target fish species; obtaining the first key habitat information required when the spawning occurrence probability of all fish species that produce drifting eggs and the regulated target fish species is not less than a first preset threshold; obtaining the second key habitat information required when the fish egg density of all fish species that produce drifting eggs and the regulated target fish species is not less than a second preset threshold; determining a reservoir ecological regulation plan according to the first key habitat information and the second key habitat information of the river section; and carrying out reservoir ecological regulation according to the reservoir ecological regulation plan. Through the above technical solution, the adverse impact of reservoir regulation operation on the spawning of fish species that produce drifting eggs can be alleviated, which is beneficial to promoting the restoration of fish resources and the protection of biodiversity.

The invention belongs to the technical field of deep sea culture, and discloses a novel bottom-supported truss lifting folding intelligent culture net cage which comprises a bottom-supported truss platform, a net cage body is arranged in the middle of the bottom-supported truss platform, and a netting is arranged on the net cage body; the netting cover is arranged at the top of the net cage and used for sealing the top of the net cage; the connecting and moving device is arranged on the seat bottom type truss platform and the netting, the connecting and moving device comprises a netting bottom frame located on the outer side of the bottom end of the netting, and a movable frame is arranged at the top of the netting bottom frame; the net drawing frame is arranged on the top of the movable frame and the outer side of the top end of the netting. The truss base ascends and descends, the breeding depth can be better changed, the lifting assemblies are independently connected with the corresponding foldable net cages, nettings are prevented from being disordered, the multiple net cages can independently ascend and descend, then different fishes are bred and independently collected, applicability is high, the net cage utilization rate is increased, and modular breeding is facilitated.

The invention discloses a Pelteobagrus vachelli population dynamic monitoring system and method, particularly relates to the technical field of fishery resource monitoring, and aims to solve the problems of inaccurate juvenile fish survival rate evaluation and poor monitoring timeliness in a benthic hidden environment in the prior art. The method comprises the following steps: arranging a benthic penetration type sonar array to synchronously collect a water body reflection signal and a benthic environment sample, and extracting juvenile fish specific gene fragments by combining an environment DNA (Deoxyribose Nucleic Acid) enrichment technology to generate concentration distribution data; screening juvenile fish distribution data by using an acoustic reflection signal and body length correlation model, and positioning an active hot spot area through space-time overlapping analysis; deploying a directional sound wave excitation device to obtain escape trajectory data, and calculating a survival rate in combination with a density attenuation model; finally, multi-source data and topographic features are fused to generate a real-time population dynamic monitoring result, and high-precision and non-intrusive monitoring of the juvenile fish population in the hidden environment is realized.

The invention provides an intelligent measuring and calculating method for the high-density fish body length of a culture pond in the technical field of fish body length measuring and calculating. The method comprises the steps that S1, a large number of historical fish school images are acquired to train a fish detection model; s2, setting a fish form constraint parameter, calibrating a camera parameter, collecting a culture pond video through a binocular camera, and analyzing the culture pond video to obtain a left eye image and a right eye image; s3, inputting the left eye image and the right eye image into a fish detection model to obtain a fish body bounding box carrying confidence, and filtering the fish body bounding box through the fingerling form constraint parameters and the confidence; s4, performing stereo matching on the fish body bounding boxes based on the left eye image and the right eye image so as to calculate the depth value of the fish body corresponding to each fish body bounding box; and S5, obtaining the fish body length based on the fish body bounding box through the camera parameters and the depth value. The method has the advantages that the accuracy, efficiency and reliability of measuring and calculating the length of the fish body are greatly improved.

The invention discloses a method for monitoring, describing and diagnosing abnormal behaviors of fishes, which constructs an abnormal behavior feature extraction network perceived by using abundant branch aggregation pixels in a backbone network, and improves the feature representation capability of the backbone network for irregular body surface shape parts of fishes and complex contour targets of underwater fishes. A detail enhancement module of parallel pixel fusion attention is introduced into a hybrid encoder, important features of each sub-region are independently enhanced, and meanwhile, natural transition of features between adjacent blocks is ensured during sub-feature image fusion. And a cross-scale abnormal small target decoupling detection head with dynamic weight distribution is constructed in a decoder and a detection head module, so that the model can accurately detect abnormal targets with relatively deviated underwater shooting angles and immature and small-sized to-be-detected fingerlings. The method is suitable for rapidly capturing abnormal behavior characteristics such as fish rollover, rapid convulsion and illness, and successfully improves the speed and precision of fish abnormal behavior monitoring.

The invention provides a fish body length estimation method and system based on a global guidance semantic segmentation network, relates to the technical field of computer vision and artificial intelligence, and aims to solve the problems that in a scene that a fish body in a monocular image and complex background interference coexist, and in a multi-fish-species mixed scene, the model segmentation generalization ability in the prior art is insufficient, and the fish body length estimation accuracy is poor. And high-precision and robust mask segmentation is difficult to realize. The method comprises the following steps: acquiring a fish body monocular image, and performing distortion correction on the fish body monocular image; inputting the corrected fish body monocular image into a trained global guide semantic segmentation network for semantic segmentation to obtain a semantic segmentation mask graph of the fish body and the calibration plate, and constructing a mapping relationship between the physical size and the pixel size of the calibration plate; and performing ellipse fitting on the semantic segmentation mask graph of the fish body, calculating the pixel length of the fish body, and converting the pixel length of the fish body into the actual length of the fish body. The method solves the problems in the prior art, provides the generalization ability of the network model, and achieves the precise estimation of the length of the fish body.

The invention provides a method for correcting and counting the natural breeding scale of fishes laying drifting eggs. The method comprises the following steps: collecting basic data of a target river section; collecting roes and fries of fishes laying drifting roes day by day at the lower boundary of the target river section, obtaining the number of early resources every day, sampling time, and collecting flow velocity and flow data near a net opening; through indoor culture and biological identification, the egg and fry development time of the fishes laying the drifting eggs is determined; based on the collected basic data, a target river section non-constant flow mathematical model is constructed, and model parameters are verified; according to the non-constant flow mathematical model, determining the specific section position of each fish laying the drifting eggs during egg laying; and calculating the flow corresponding to the section where the fishes laying the drifting eggs lay eggs and the flow velocity of the fishes drifting to the monitoring section from the downstream, and counting and calculating the overall spawning scale condition of the target river section during the monitoring period by adopting a spawning scale statistical method of the fishes laying the drifting eggs. And the natural breeding scale condition of the fishes in the target river section can be reflected more truly.

The invention discloses a lightweight multi-fingerling and fry counting device based on computer vision and a use method thereof, and belongs to the technical field of machine vision and machinery, and the lightweight multi-fingerling and fry counting device comprises a water flow conveying device and a counting and processing device. Wherein the water flow conveying equipment is composed of a fish inlet funnel, two different water conveying pipelines, a fish fry slideway and a fish outlet, the fish inlet is funnel-shaped, water flow conveying is adopted, the inclination angle of the water flow conveying equipment can ensure that fish fries are not clamped in the fish inlet, meanwhile, the water flow is ensured to wash the fish fries into the slideway, and the water conveying pipelines are all plastic pipelines. The fish inlet funnel and the fry slideway are made of plastic materials with frosted surfaces, and are more resistant to seawater corrosion compared with metal materials. The counting and processing device is composed of a camera at the top of the device, a displayer and a computer host at the bottom, and the compatibility and real-time computing capacity of different algorithms are effectively improved. According to the invention, counting work can be carried out on different types of fish, a large amount of plastic and lightweight aluminum metal are used, and the size and the weight of equipment are obviously reduced.

The invention discloses a fish repelling method and system based on multi-frequency sound wave cooperation and dynamic environment perception. The method comprises the steps that water area environment parameters are acquired, and the types and the density of fishes in the water area are recognized through sonar, water velocity and water quality parameters; matching an auditory sensitive frequency band set according to the fish species, and constructing a multi-frequency-band sound wave emission parameter set in combination with the water area environment parameters; according to the sound wave emission parameter set, the transducer array is controlled to emit a multi-band composite sound wave signal, and a sound field with a coverage angle of at least 180 degrees is formed; and monitoring the driving effect in real time, and dynamically adjusting the multi-band sound wave emission parameter set according to the density change of the fish school. According to the method, the fish repelling efficiency can be remarkably improved, the influence on non-target species is reduced, and an innovative solution is provided for ecological protection of water conservancy projects.

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 discloses an X-chromosome specific molecular marker of micropterus salmoides and application of the X-chromosome specific molecular marker. On the basis of a whole genome sequencing technology, the X chromosome specific molecular marker of micropterus salmoides is obtained. Aiming at the molecular marker, the invention also provides a detection primer pair and a detection method of the molecular marker, and by detecting the molecular marker, rapid and accurate screening of YY supermale fish individuals can be realized to obtain a YY supermale fish population. The obtained YY super-male fish group and a proper female fish group are jointly fed and bred, and then the micropterus salmoides all-male fingerling can be obtained. If the YY super-male fish group and the YY pseudo-female fish group are jointly bred and bred, largemouth bass offspring which is all YY super-male fish can be obtained. Compared with a traditional all-male breeding method of the largemouth black bass, the all-male breeding method of the largemouth black bass is beneficial to simplifying all-male breeding steps of the largemouth black bass, shortening breeding time, and beneficial to cultivation of all-male largemouth black bass fingerlings and popularization of single-male breeding of the largemouth black bass.

A comprehensive system for hatching drifting fish eggs includes a culture tank, a flow control system, a roundabout real-time monitoring system, a stepped egg transfer system, an egg release system, an egg collection system, a tailwater collection platform, and a water storage tank. This system eliminates the influence of previous single-factor conditions on hatching, achieving the adjustability of influencing factors under different hatching environments, real-time tracking of the entire egg hatching process, and simulation of natural water flow conditions. During the hatching process, the system replaces the cumbersome operation of multiple manual egg releases in previous patents with a single, fully automated egg release process, thereby improving the egg hatching rate. Furthermore, to identify the drifting path patterns of the eggs during hatching, side-view and top-view egg drift monitoring systems and a hydraulic characteristics testing system are provided. The hatching drift distance of the eggs, as calculated by the monitoring system, can provide a reference for the fish species richness of the river's main stream and tributaries.

This invention belongs to the field of molecular genetics and discloses a method and application for controlling fish fertility using in vivo gene editing technology. The applicant, for the first time, cloned a carp-specific U6 promoter and used this promoter to construct the U6 gene. MOVIE gRNA transgenic vectors and water The Cas9 vector allows for the establishment of an in vivo editing system. This strategy enables the heritability of sterility, a reproductive control trait, through hybridization of fertile parents to produce sterile offspring. The operation is highly efficient, simple, and environmentally friendly. Furthermore, since high-copy-rate short, scattered repetitive sequences exist in all fish species, this strategy has broad applicability across species.

To provide a lure for fishing capable of simultaneously aiming at the extension of a long casting distance of the lure for fishing and the control of a sinking speed.SOLUTION: The fishing lure 1 includes a lure having a large specific gravity, which is generally called a hard lure, as a base body (weight) 7, and a bag-shaped structure 8 formed of a soft resin, a soft rubber, or the like and covering the base body. Since the base body (weight) 7 and the structure 8 to be covered are integrated, the air resistance at the time of long distance casting and flying can be reduced, and the effect of extending the long distance casting distance is brought about. The mother body is provided with a mechanism for operating the structure to be covered, and the structure to be covered controls the sinking speed and appeals to the target fish species by the operation of the structure after landing on the water, so that an increase in the fishing result can be expected.SELECTED DRAWING: Figure 1

This invention discloses a multi-unit composite stress tiered breeding device and method for juvenile large yellow croaker, belonging to the field of aquaculture breeding technology. The device uses a central control unit as its sole core, forming a fully integrated unidirectional closed-loop drive system. Four independent breeding units are connected through a transparent channel with a centrally located aeration head, forming a physical flow-limiting isolation structure. Each unit independently regulates water temperature, salinity, and dissolved oxygen, creating a multi-factor composite stress gradient. The breeding method employs a three-factor linear equal-gradient synergistic progressive setting, utilizing the juvenile fish's autonomous adaptation and avoidance instincts to achieve cross-unit migration and natural selection. Combined with contour recognition and dynamic tracking algorithms, it monitors the fish population status and mortality rate in real time, and identifies superior offspring with comprehensive stress resistance through secondary verification under extreme stress. This invention offers high screening accuracy and automation, increasing the survival rate of superior individuals by over 40%, reducing labor costs by over 60%, and allowing for flexible adjustment of device parameters. It can be extended to the stress resistance breeding of other marine economic fish species.

The utility model relates to the technical field of fish farming, in particular to a fish farming anti-bird net convenient to fold and unfold, which comprises a plurality of groups of supports and a bottom groove, the top ends of the supports are provided with rails, the top ends of the rails are provided with notches, the bottom ends of the inner walls of the rails are fixedly connected with springs, and the bottom groove is provided with a plurality of grooves. The end face of the spring is fixedly connected with a movable plate, multiple sets of rolling balls are arranged at the top end of the movable plate, the rolling balls are embedded in the track, ropes are fixed to the outer portions of the rolling balls close to the edge of the support, and vertical rods are welded to the top ends of the rolling balls. According to the fish culture anti-bird net convenient to fold and unfold, by arranging the woven net surface, when the woven net surface is placed, the net can be folded and unfolded only by pulling the woven net surface by an operator, the woven net surface does not need to be detached from the bracket little by little, the operation difficulty and consumed operation time are reduced, and the fish culture anti-bird net convenient to fold and unfold is suitable for large-area fish pond culture; the problem that a large amount of time and manpower are needed to stretch or tighten the net face is solved.

The application discloses a kind of fishery propagation control optimization method and system for target water area.The method comprises the following steps: obtaining the fishery ecological change data of target water area, determining suitable propagation fish species and identifying its ecological preference;Collecting historical water layering structure data, analyzing seasonal extreme events using time series decomposition algorithm, and constructing extreme value feature dataset;Based on the dataset, generate water environment stress feature map, and develop propagation control scheme combined with fish ecological preference;Construct a propagation fish monitoring sensor network, monitor the propagation effect of fish in real time, and optimize network control according to monitoring quality information.The method can realize fine management and dynamic optimization of fish propagation process, improve the effect of fish propagation and ecological environment adaptability, and provide technical support for sustainable utilization of fishery resources.

The invention discloses a fish inlet structure of a fish passing facility, and relates to the technical field of fish passing facilities, the fish inlet structure comprises a fish passing channel, one side of the top end of the fish passing channel is movably connected with a first limiting side plate, and one side, far away from the first limiting side plate, of the top end of the fish passing channel is detachably provided with a second limiting side plate. A first limiting side plate and a second limiting side plate are arranged to limit the position of a fish body, meanwhile, a one-way drainage effect is achieved through protection buffer plates on the side faces of the first limiting side plate and the second limiting side plate, the problem that backflow of the fish affects drainage of other fingerlings is avoided, meanwhile, a plurality of buffer springs are arranged on the back faces of the protection buffer plates, and the safety of the fish is improved. When fishes pass through the space between the two protective buffer plates, the fishes directly impact the protective buffer plates, a certain buffer effect can be achieved through buffer springs, the problem that the protective buffer plates are damaged due to impact is avoided, the problem that the fingerling device is damaged can be avoided, and the drainage safety of the device is improved.

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a fish inlet structure of a fish passing facility and a dynamic fish inlet method, and the fish inlet structure comprises an outer plate, a gate and a first opening and closing leaf plate. A fish inlet channel is formed between the outer plates and comprises a front section, a middle section and a rear section, the gate is arranged at the downstream end of the fish inlet channel, namely the gate is located at the end of the front section of the fish inlet channel, an opening and closing window penetrating through the inner sides and the outer sides of the outer plates is formed in the front section of the outer plates, and the first opening and closing leaf plate is arranged at the opening and closing window. The first opening and closing leaf plate can adjust the opening and closing degree of the opening and closing window through rotation. According to the fish inlet, through the combination of the first opening and closing leaf plate, the second opening and closing leaf plate and water flow dynamics, upgrading of the fish inlet from static fixation to dynamic adaptation is achieved, the problem that a traditional fish inlet is insufficient in adaptability to water flow changes and fish variety differences is effectively solved, and the fish inlet efficiency of the fish inlet of the fish passing facility is effectively improved.

The application belongs to the technical field of water conservancy projects, and discloses a fish collecting device based on a lifting mechanism and a fish collecting method, wherein the fish collecting device based on the lifting mechanism comprises a fish collecting box body, a pair of tapered entrances are symmetrically arranged at the center of the two sides of the fish collecting box body, a pair of mounting plates are fixedly connected to the top edges of the fish collecting box body, and a protective shell is fixedly connected to the middle part of the fish collecting box body. Through cooperation of structures such as the arc-shaped bevel pipe, the inner bushing and the flexible spiral pad, a laminar flow type circular flow is generated in the fish collecting box body by the water pump, which is similar to a small vortex. The vortex drives the surrounding water to flow to the tapered entrance for fish entering, and forms a significant fish-attracting water flow. For fish species that like water flow, the water flow is used to drive fish into the fish collecting box body by using the rheotaxis of fish. The system can adjust the water pump power according to the body type, species and hydrological conditions of the target fish on the same day, so as to control the flow rate of the fish-attracting water flow and achieve the best effect.

A fishing rig is provided that combines differing combinations of assemblies to form a multipurpose fishing rig capable of fishing differing environments, species and differing fishing methods. The assemblies of the fishing rig include a main leader assembly that utilizes an inline float with a radial bore to attach to a side leader assembly. The side leader assembly includes at least a spacer bead and a cinch bead utilized for adjustable tensioning when attached to the main leader. A hook or lure assembly is provided and attached to the side leader assembly for either live bait, or lure fishing.

The application provides an underwater fish target detection method and device, and belongs to the technical field of target detection. The method comprises the following steps: inputting an underwater image into a target recognition model to obtain a fish species recognition result output by the target recognition model and position information of the fish in the underwater image; wherein the target recognition model comprises a backbone network and a fusion module; the backbone network comprises a plurality of serially connected feature extraction and restoration networks; each feature extraction and restoration network is used for performing feature extraction on the underwater image to obtain a fish feature map, and performing low-frequency information restoration on the underwater image to obtain a low-frequency texture feature map; the fish feature map and the low-frequency texture feature map are fused to obtain a restored feature map; and the fusion module is used for fusing the restored feature maps of the feature extraction and restoration networks. The underwater fish target detection method and device provided by the application can realize reliable and accurate detection of underwater fish targets.

The utility model provides a multifunctional fish breeding and culturing facility. The multifunctional fish breeding and culturing facility comprises a hatching spraying facility, a movable partition plate, a culturing water inlet pipe, a culturing tank body, a hatching frame and a culturing water outlet pipe, the depth of the cylinder body is gradually increased along the water flow direction; partition plate inserting grooves are formed in the inner wall of the breeding tank body at intervals in the water flow direction, and the movable partition plate is inserted into each partition plate inserting groove; the breeding space of the breeding tank body is divided into a plurality of breeding subareas through the movable partition plates. According to the utility model, intensive culture facilities are adopted to solve the problems of viscous fertilized egg incubation, culture of fishes with different habits and partitioned culture of fishes with different specifications in different stages, so that the production and culture in the whole stage from parent fish culture, parent fish spawning and fertilization, fertilized egg incubation to open fry culture, fry culture and fish culture are realized; the artificial injury to the fishes caused by frequent conversion of culture facilities in the culture process is avoided, and the culture efficiency and effect of the fishes are improved.

The present application relates to fish breeding technical field, propose a kind of fish egg hatching device and hatching method, including three-way pipe, oxygenation pipe, incubation pipe, adjusting piece and shaftless propeller, wherein, three-way pipe has first pipe mouth, second pipe mouth and third pipe mouth;Oxygenation pipe is connected with first pipe mouth and passes through, and the aeration end of oxygenation pipe corresponds third pipe mouth;Incubation pipe one end is connected with second pipe mouth and passes through;Adjusting piece is set in third pipe mouth;Shaftless propeller is set on the end of incubation pipe away from three-way pipe.This application can control the flux of third pipe mouth by adjusting piece, i.e. the oxygen content of water flow into incubation pipe through third pipe mouth can be controlled;At the same time, incubation pipe is used for water flow, by controlling the power of shaftless propeller, i.e. water flow can be controlled, so it is convenient to control the oxygen content of water flow and flow rate, when setting multiple devices for hatching, distinctive hatching cycle contrast can be obtained, which is beneficial to help hatching staff to accumulate relevant experience.

The invention relates to the technical field of fish monitoring, in particular to a rare fish nondestructive monitoring method and system based on water eDNA sample recognition. A hotspot model is constructed through historical eDNA sampling distribution, sampling hotspot transfer prediction is achieved, and the optimal sampling point position is determined; high-throughput sequencing and a base sequence recognition decision tree are combined, the sequence rare degree is judged, and valuable and rare fishes are retrieved; further coupling the water flow dynamic model and the eDNA migration state space model, and tracing the potential migration area or inhabitation area of the rare fish; and a dynamic population community graph is constructed based on the time sequence community change, and the seasonal scale trend is analyzed. According to the method, accurate nondestructive monitoring of seasonal distribution rules and community structure trends of the rare fishes is realized on the basis of efficient collection and accurate identification of the eDNA of the water body, and a reliable scientific basis is provided for resource protection of the rare fishes in different water areas.

The invention relates to the technical field of fry and fingerling breeding, in particular to an anti-wind-wave marine ranch breeding device which comprises a base plate and a bottom plate, an anti-falling enclosure assembly is arranged above the base plate, a plurality of connecting columns are fixed to the bottom face of the base plate, a plurality of limiting frames are arranged below the base plate, the connecting columns penetrate through the limiting frames, and the connecting columns penetrate through the limiting frames. The bottom ends of the connecting columns are fixed to the top face of the bottom plate, a first netting is fixed between the base plate and the bottom plate, and a second netting is fixed between the bottom plate of the first netting and the base plate. The device has the advantages that the limiting frame is hollow and provided with the vent holes, bubbles are released to water through the air pump and the air delivery pipe, the dissolved oxygen concentration is increased, and healthy growth of fishes is promoted. A reserved cavity and a liquid dispersing hole are formed in the driving screw rod, and an antimicrobial agent or a nutritional agent is injected through pressurization of a liquid injection pipe, so that uniform spraying is realized, and manual operation errors are reduced.

The present invention relates to the field of fishway technology, and in particular to a method for the structure, construction, and design of a canal fishway, comprising the following steps: S1: establishing a fishway database at a hub, evaluating the swimming ability of target fish species passing through the fishway, and determining the migratory ecological characteristics of the target fish species; S2: designing a fishway scheme and determining a preliminary design scheme for the fishway structure; S3: designing a physical model of a local section of the fishway project, and conducting a physical model test of the local section of the fishway project to obtain a recommended scheme for the pool chamber structure located upstream of the eel channel in the vertical slot fishway; S4: establishing an overall model of the fishway, and conducting an overall model test of the fishway to determine the overall structural scheme of the fishway. The design method of a canal fishway in the present application provides a theoretical basis for setting up an eel channel suitable for the migration of eels and Hepu mitten crabs and a vertical slot fishway suitable for the migration of red-eyed trout and dace, thereby solving the problem of providing migration channels for eels, red-eyed trout, dace, river perch, Hepu mitten crabs, etc.