54 results about "Fish resources" patented technology

The invention relates to the technical field of water conservancy and hydropower, in particular to a corridor type supersaturated gas quick release device which comprises a concrete bottom plate, a plurality of concrete enclosing walls are arranged on the top face of the concrete bottom plate, and the concrete enclosing walls are sequentially arranged at intervals from inside to outside; a clearance between every two adjacent concrete enclosing walls forms a corridor area; a plurality of water pressure and air pressure damage assemblies are arranged in the innermost circle of concrete enclosing wall, a plurality of energy dissipation bodies are filled in the innermost circle of concrete enclosing wall, and the water pressure and air pressure damage assemblies are distributed on the top face of the concrete bottom plate in an array mode; a water passing hole is formed in each circle of concrete enclosing wall; a plurality of flow limiting plates are arranged in the corridor area at intervals, and flow passing structures are arranged on the flow limiting plates. By the adoption of the structure, multi-flow-state distribution areas such as turbulent flow, backflow and rotational flow can be formed, the medium contact area of supersaturated gas is greatly increased, precipitation of the supersaturated gas is accelerated, and positive significance is achieved for protecting aquatic organisms and fish resources of downstream rivers.

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 provides a primer probe combination and a kit for detecting eDNA of acipenser Yangtze River and application of the primer probe combination and the kit, and belongs to the technical field of molecular biology and molecular ecology. The invention designs two groups of primer probe combinations for detecting eDNA of acipenser Yangtze River, and the nucleotide sequences of the primer probe combinations are respectively shown as SEQ ID No.1-6. According to the method, eDNA in a water sample to be detected is extracted, ddPCR amplification is carried out by utilizing the primer probe combination, if positive amplification can occur, it is judged that the water sample contains the eDNA of the Yangtze River sturgeons, and then tracking of behavior tracks of Yangtze River sturgeon schools is achieved. The primer probe combination disclosed by the invention can be used for carrying out specific detection on target DNA fragments of the acipenser pratus in a culture water body and a field water body, the sensitivity is relatively high and is 0.07 copies / mu L, and the primer probe combination can be widely applied to the fields of eDNA detection of the acipenser pratus and resource protection of rare fishes.

The application discloses a reservoir ecological flow allocation method based on multi-section water diversion and multi-target fish collaborative protection, which comprises the following steps: S1, determining a hydrological sensitive area and an ecological sensitive area based on water diversion influence constraints and fish resource distribution data, superimposing the hydrological sensitive area and the ecological sensitive area to construct a habitat evaluation model, determining a key habitat of a typical fish, and further determining a target spawning ground; S2, integrating a two-dimensional hydrodynamic model and a fish habitat model, calculating habitat hydraulic requirements and flow pulse requirements of different fishes in a spawning period, constructing an ecological water demand process in the spawning period, and simultaneously calculating an ecological base flow to supplement basic hydrological requirements in a non-spawning period; and S3, coupling ecological water demand for multiple spawning grounds overlapping in the spawning period, and determining a reservoir ecological flow collaborative allocation scheme. The method is based on the particularity of multi-section water diversion disturbance and multi-target collaborative protection of the west line project water source area, studies ecological water demand of typical fishes, and determines a reservoir ecological flow allocation scheme.

The invention discloses a large-scale fish resource detection method based on multi-frequency sound waves and an AI algorithm. The method comprises the following steps: correcting an original echo signal into a signal under a standard environment characteristic in combination with the environment characteristic; extracting and normalizing frequency spectrum characteristics and time sequence distribution information of the echo signals; obtaining frequency response characteristic data of fish types and associating spatial position information of the fish types; obtaining a fish swarm proportion through three-dimensional point cloud clustering analysis; identifying a fish school abnormal behavior type and an area range, and formulating a fish school abnormal intervention strategy; predicting a time point, an area range, an abnormality type and a reason of the abnormal behavior of the fish school in a future time period; and in combination with Mahalanobis distance and fish school behavior prediction, evaluating the effect of the fish school abnormal intervention strategy, and dynamically adjusting the fish school abnormal intervention strategy. According to the invention, the precision and efficiency of fish resource detection can be improved, the requirements of dynamic monitoring and precise management of fish schools in a large-range water area are met, and the healthy and sustainable development of a water area ecological system is further promoted.

The invention belongs to the field of ecology, and provides a reservoir ecological scheduling method capable of meeting fish spawning occurrence and roe density requirements, which comprises the following steps: acquiring natural reproduction characteristic information and habitat information of fishes laying drifting roes in a scheduling target river reach, and determining the scheduling target fishes; acquiring first key habitat information required when the spawning occurrence probability of all the fishes laying the drifting eggs and the scheduling target fishes is not less than a first preset threshold value; acquiring second key habitat information required when the roe density of all the fishes laying the drifting roes and the scheduling target type of roes is not less than a second preset threshold value; according to the river reach first key habitat information and the river reach second key habitat information, determining a reservoir ecological scheduling scheme; and performing reservoir ecological scheduling according to the reservoir ecological scheduling scheme. By means of the technical scheme, the adverse effect of reservoir dispatching operation on spawning of the fishes laying the drifting eggs can be relieved, and fish resource recovery and biodiversity protection are facilitated.

The invention belongs to the technical field of water ecological protection and water resource management, and particularly provides a cascade reservoir operation ecological benefit evaluation method based on a habitat model, and the method comprises the steps: collecting the topographic data of a downstream fish spawning site of a cascade reservoir, the actual measurement hydrological data of a hydrological station, and the biological data of target fishes; performing unstructured triangular mesh division on the research river reach by adopting a finite volume method, and simulating flow velocity and water depth distribution of a research area through a continuity equation and a momentum equation; according to the biological data of the target fish, a suitability curve of the flow velocity and the water depth is constructed, and the habitat suitability index HIS of each grid is calculated in combination with the flow velocity and water depth data output by the hydrodynamic module; and calculating an effective available area WUA and an overall suitability index OSI based on the HSI value for ecological benefit assessment. The method comprehensively considers the influence of the cascade reservoirs on the correlation factors, accurately evaluates the ecological benefits, and provides a scientific basis for ecological scheduling of the cascade reservoirs and fish resource protection.

The invention relates to a small river habitat restoration effect evaluation method, and aims at solving the problems of habitat damage, habitat fragmentation and the like caused by hydroelectric development to formulate restoration targets of restoring river connectivity, guaranteeing ecological base flow and constructing a stable river ecosystem. The method comprises the following steps: firstly, monitoring a river, then monitoring fish resources and an ecological environment, carrying out special investigation on ecological restoration measures, and finally, constructing an evaluation index system from the dimensions of river connectivity, habitat quality, biodiversity, ecological bearing capacity and the like based on monitoring data. Scientific quantitative evaluation is realized, support is provided for engineering optimization, and river ecological protection and restoration technology development can be promoted.

This application discloses a comprehensive assessment method and system for multi-source data management and correction of watershed fish resources. The method includes: extracting multi-dimensional features from a first data matrix to obtain a first feature matrix; classifying species data based on anomaly scores, outputting verification results, and correcting the first feature matrix to obtain a second feature matrix; acquiring environmental DNA sequencing data and corresponding environmental data; obtaining a first eDNA dataset from the environmental DNA sequencing data through ecological screening; correcting the species in the first eDNA dataset to obtain a second eDNA dataset; fusing the second eDNA dataset with the second feature matrix; calculating biodiversity indices and analyzing community structure; analyzing long-term trends in population and community structure; and generating a comprehensive assessment report. This application achieves full-process automation and intelligence from data quality control and fusion to assessment, significantly improving the accuracy and efficiency of watershed fish resource assessment.

The application discloses a fish resource monitoring method and system based on sonar images and electronic equipment, and the fish resource monitoring method comprises the following steps: acquiring sonar images of a fish pond; detecting fish targets in more than two frames of the sonar images and tracking the fish targets; and determining the number of the fish targets in the fish pond according to the tracking result. Through the above steps, the fish resource monitoring method can accurately monitor the number of the fish targets in the fish pond, and does not cause adverse effects on the growth environment of the fish during the monitoring process.

The present invention provides an intelligent fishing-type river fish resource investigation device and method, comprising: a fishing main body unit, an automatic floating and sinking mechanism, a fish resource identification camera, a remote communication device, and an intelligent controller; the driving end of the automatic floating and sinking mechanism is connected to the fishing main body box and is used to drive the fishing main body unit to sink below the water surface or lift above the water surface; the intelligent controller is respectively connected to the fish outlet opening and closing mechanism, the fishing and attracting lamp, the automatic floating and sinking mechanism, the fish resource identification camera, and the remote communication device. The intelligent fishing-type river fish resource investigation device and method provided by the present invention utilize the intelligent Internet of Things mode between components to automatically float and sink and catch fish regularly, and with the help of an intelligent camera and a background fish intelligent identification platform, continuous and comparable original data of the same section can be obtained, which is more efficient and intelligent than the traditional manual on-site fishing operation.

A movable marine fishing device comprises a support, a fixed ring plate, a movable ring plate and a lifting table, a solar cell panel is arranged above the support, an air bag is connected to the outer side of the support, a circle of supporting ring is arranged on the outer side of the air bag, and the lower end of the solar cell panel is perpendicularly connected with the supporting ring through a stand column; the lower end face of the supporting ring is perpendicularly connected with an opening and closing ring plate, a lifting fishing table is arranged in the opening and closing ring plate, a bottom net is arranged at the bottom of the opening and closing ring plate in a surrounding mode, and a lifting system is arranged on the support and connected with the lifting fishing table. The device can be arranged in the ocean, fish resources are obtained regularly in an automatic fishing mode, fishermen only need to take the fish resources regularly, manpower and material resources are saved, and the benefits of the fishermen are increased.

The invention discloses an intelligent intermittent fishing operation management method and system based on lamplight purse seine trapping. A fish behavior spatio-temporal evolution graph is constructed by acquiring fish resource survey data of a fishing destination of a target fishing boat and fish dynamic response data after arrangement of a lamplight purse seine, future gathering tropism change of a fish school is predicted, and the actual trapping abundance and the expected trapping abundance of the lamplight purse seine are determined according to the future gathering tropism change. When the actual trapping abundance is lower than the expected trapping abundance, in combination with water body environment data and fingerling space-time distribution sequence data, identifying multi-source environment interference factors such as natural enemy interference factors and water body environment interference factors, monitoring each interference factor in real time, evaluating interference intensity change, and constructing an interference intensity change curve; and generating an intermittent fishing operation strategy of the target fishing boat. According to the invention, intelligent regulation and control of fishing operation can be realized, the trapping efficiency is improved, invalid fishing is reduced, and the application value is good.

This invention proposes a data analysis-based method and system for assessing fish resources in reservoirs, belonging to the field of resource assessment. The method includes collecting ecological characteristic data and population characteristic parameters of introduced and native fish populations in the reservoir; calculating niche overlap indices between introduced and native fish populations in both spatial and trophic dimensions, and integrating these to obtain a comprehensive niche difference index; calculating the population growth potential of each population and obtaining a fitness difference index; processing the comprehensive niche difference index and fitness difference index to obtain a coexistence stability score and determining the coexistence stability level of the two populations; acquiring time-series data of the niche overlap index, extracting fluctuation characteristic parameters, and generating a fish resource assessment report based on the fluctuation characteristic parameters and the coexistence stability level. This invention can comprehensively assess niche differences between populations.

The present invention provides an experimental device and method for fish fry and spawning suitable for feeding fry from the Guanjiang River. The device comprises a main outlet trough and an auxiliary outlet trough, with a simulated lake pool provided between the main outlet trough and the auxiliary outlet trough. A diversion port on one side of the main outlet trough is connected to one side of the simulated lake pool, and the other side of the simulated lake pool is connected to the head of the auxiliary outlet trough. The tail ends of the main outlet trough and the auxiliary outlet trough are connected to a water collection trough, and the head of the main outlet trough is connected to a water inlet pipe. An arc-shaped isolation net is also provided in the middle of the simulated lake pool, and the isolation net divides the simulated lake pool into a spawning area and a nursery area. This device provides a scientific basis for the rational development and utilization of lake fish resources and is conducive to the formulation of more scientific and reasonable fish management policies. It is also conducive to protecting and restoring the natural ecological environment and promoting the sustainable development of lake fish resources.

The invention discloses a watershed fish resource multi-source data management and correction comprehensive evaluation method and system. The method comprises the following steps: performing multi-dimensional feature extraction on a first data matrix to obtain a first feature matrix; classifying the species data based on the abnormal score, outputting a rechecking result, and correcting the first feature matrix to obtain a second feature matrix; environment DNA sequencing data and corresponding environment data are obtained; the method comprises the following steps: ecologically screening environmental DNA sequencing data to obtain a first eDNA data set; correcting species in the first eDNA data set to obtain a second eDNA data set; fusing the second eDNA data set with the second feature matrix; calculating a biodiversity index and analyzing a community structure; analyzing the long-term change trend of the population and the community structure; and generating a comprehensive evaluation report. According to the method, the full-process automation and intelligentization from data quality control and fusion to evaluation are realized, and the accuracy and efficiency of river basin fish resource evaluation are remarkably improved.

The present invention provides a control method for improving the continuity of the habitat for hatching and feeding of drifting fish eggs, including: collecting basic data on control working conditions; calculating the hydrodynamic conditions along the hatching channel; calculating the water temperature along the hatching channel, predicting the drift time required for the fish eggs to complete hatching; calculating the drift age of the fish eggs along the hatching channel, predicting the drift distance required for the fish eggs to complete hatching based on the drift age and the drift time, and then locating the position where the fish eggs have completed hatching; locating the fish egg hatching channel according to the drift distance required for the fish eggs to complete hatching and the position where the fish eggs have completed hatching, analyzing the habitat conditions of the fish egg hatching channel and the water area after hatching, judging whether the water area is suitable for feeding after the fish eggs have completed hatching, and using the current control working condition as a recommended control scheme for improving the continuity of the hatching and feeding of drifting fish eggs when it is judged to be suitable. The control method proposed by the present invention can ensure the continuity of key life history processes of fish eggs, which is beneficial to the protection of fish resources.

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a fish dam-passing fish collecting device site selection method, which comprises the following steps: S1, collecting and analyzing construction conditions; s2, investigating fish resources; s3, investigating a fish migration route; s4, selecting an alternative area; s5, investigating the environment of the alternative region; s6, screening alternative areas; according to the method, the alternative areas suitable for construction are gradually screened out according to the migration habit and swimming ability of the target fish school and the actual hydrological data and geographic data of the river channel in sequence, so that the obtained site can ensure the passing efficiency of the target fish, and the operation efficiency of the fish collecting device is improved; and meanwhile, a TOPSIS method is adopted to comprehensively consider conditions such as the construction cost and environmental influence factors of each alternative area, and an optimal construction address which comprehensively considers multiple parties and can meet the fish school passing efficiency, reduce the construction cost and reduce damage and influence on the natural environment is selected from the alternative areas.

The application discloses a water taking ecological scheduling method based on fish early resource protection and belongs to the technical field of environmental protection of water crossing engineering. The method comprises the following steps: (1) monitoring fish early resources, and acquiring fish early resource biomass distribution data of a water taking section and each water layer of an upstream and a downstream; (2) obtaining fish early resource loss amount by using multi-dimensional space-time parameter coupling loss amount analysis; optimizing water taking head design to minimize fish early resource loss amount; and (3) establishing an ecological-hydraulic coupling multi-objective optimization decision model, calculating fish early resource loss amount in real time, and screening a scheduling scheme considering ecological protection and engineering efficiency. The application solves the problem that ecological protection and engineering efficiency are difficult to be considered in traditional technology by dynamic scheduling and engineering structure innovation, and provides a scientific and quantitative solution for sustainable utilization of water resources in a basin.

The application discloses a marine economic fish resource evaluation platform based on multi-source data fusion. The platform sets a target water area layer and multi-period monitoring, uses a sonar detection device to collect data to generate first fish school characteristics, collects images through an underwater camera device and generates second fish school characteristics through a preset image recognition model; a fish school characteristic matrix is constructed based on time window analysis, noise time periods are screened by using matrix similarity discrimination; the recognition process of the noise image set is dynamically adjusted in edge segmentation parameters, and the resource evaluation of economic fish is carried out by fusing and correcting the recognition result. Through multi-source data fusion analysis, difference comparison of fish school characteristics and dynamic image parameter adjustment, the application effectively improves the comprehensiveness, reliability and accuracy of fish school characteristic evaluation in complex water environment, can provide real-time dynamic data support for fishery resource management and marine ecological protection, and has a wide application prospect.

This application discloses a simulation method, system, device, and storage medium for fish community survey sampling. The method includes: acquiring hydrodynamic environmental data and historical ecological baseline data of fish in a target sea area; determining the adaptive grid topology and fish species migration response coefficients of each monitoring unit in the target sea area based on the hydrodynamic environmental data and the historical ecological baseline data of fish; identifying the core area of ​​fish resource aggregation; constructing a multi-species coupled dynamic model of fish; generating a temporal series of the spatial distribution of community structure for each monitoring unit; fusing and constructing a multi-dimensional state temporal series of the ecosystem; generating a species diversity thermodynamic field temporal series based on the multi-dimensional state temporal series of the ecosystem and a preset uncertainty quantification algorithm, and outputting a sampling station layout scheme that prioritizes coverage of highly heterogeneous areas of the fish community. This invention improves the accuracy and efficiency of marine fish community surveys through dynamic simulation and uncertainty analysis, and can support efficient sampling station optimization.

The invention provides a water diversion engineering water intake fish early-stage resource hydraulic distribution method and device based on a water permeable barrier. The device comprises the water permeable barrier, an upper restraining structure, a lower restraining structure and a control system. The permeable barrier is formed by splicing modular curtain units, the upper portion of the permeable barrier is connected between the anchoring pier and the adjustable supporting rod through a bearing main cable, and the lower portion of the permeable barrier is fixed to the underwater ground anchor through a connecting piece. During operation, data are monitored through the water level sensor, the telescopic amount of the supporting rod and the length of the main cable are adjusted in a linkage mode, the vertical gradient of the barrier changes in a self-adaptive mode, curved surface flow guiding and rising water flow are formed, on the premise that the influence on the water taking amount of the water taking opening is reduced, hydraulic sorting and guiding conveying of fish early-stage resources are achieved, and entrainment losses are effectively reduced. The invention provides a water intake fish early-stage resource entrainment loss prevention and control technology based on a hydraulic separation and curved surface diversion principle, and provides a new technical approach for realizing fish resource protection in water diversion engineering.

The invention discloses ground cage sampling equipment and a sampling method for deep water reservoir fish resource investigation, and relates to the technical field of fish breeding, the ground cage sampling equipment comprises a floating body, a propeller is fixedly connected to the side face of the floating body, and an air bag is fixedly connected to the position, close to the edge, of the surface of the floating body; the top of the floating body is fixedly connected with a lifting mechanism. According to the ground cage sampling equipment and method for deep water reservoir fish resource investigation, the bottom of the sampling and collecting mechanism makes contact with the water bottom, fishes enter the sampling and collecting mechanism under attraction of food, after a period of time, a hoist rotates reversely to make a screw rotate and move upwards, and an anti-blocking assembly cleans the surface of the screw; and the sampling and collecting mechanism carries the fishes and water to a position above the floating body, so that the problem of how to sample the fishes cultured in a deep water area so as to conveniently observe the growth condition of the fishes is solved.

The present invention discloses a method for constructing a smart marine ranch on uninhabited islands and reefs, which relates to the field of marine aquaculture technology. The method generates electricity by comprehensively utilizing wind, solar, and ocean energy to provide power for aquaculture, management, and monitoring systems. Surplus electricity is used to electrolyze seawater to produce hydrogen, and hydrogen batteries are manufactured for energy storage. A robust energy supply is achieved by constructing an energy allocation system. Sustainable fishing of fish resources is achieved by creating fish habitats. A robust supply of clean energy is achieved through an energy storage, transmission, and supply network. Automation and intelligence of fish farming are achieved by combining intelligent lifting cages with open water surfaces. Unmanned operation and management are achieved through big data, cloud computing, and the Internet of Things.

The invention discloses a river-tracing spawning migration fish resource simulation analysis method based on an age structure. The method comprises the following steps: constructing population vectors in a target lake and a river; calculating the population number of lakes and rivers every year; constructing an age structure function of a population migration breeding population in the river; calculating a repeated propagation coefficient; calculating the quantity of lake supplementary populations; and updating the future lake population vector and the total resource quantity based on the lake supplementary population quantity. According to the method, through population vector construction, age structure analysis, propagation coefficient calculation, supplementary population quantification and population iteration updating, annual iteration of population quantity is realized, and population age structure change, supplementary population fluctuation and total resource quantity evolution trend of many years can be continuously tracked. Compared with a static evaluation model, the method can quantify long-term effects of measures such as reproduction protection and migration channel improvement.

The invention relates to the technical field of aquatic ecology monitoring, and discloses source branch native juvenile fish monitoring equipment which comprises a main body frame placed in a river channel, a fish collecting bin fixedly connected to the interior of the main body frame and used for collecting and temporarily containing juvenile fish in water flow, and a plurality of limiting pieces arranged on the two sides of the main body frame correspondingly and used for limiting the juvenile fish in the water flow. The main body frame is in limiting connection with a river channel through a limiting piece, the filtering and cleaning assembly comprises two filtering pieces and two cleaning pieces, an inlet and an outlet are formed in the front end and the rear end of the fish collecting bin respectively, the two filtering pieces are arranged on the inlet and the outlet respectively, the cleaning pieces are arranged on the fish collecting bin and used for cleaning the filtering pieces, and the monitoring assembly is arranged in the fish collecting bin. The fish collecting cabin is used for observing fish fries contained in the fish collecting cabin and acquiring fish collecting images. The core problems of stability, blocking resistance, image quality, automation degree and the like in field fish early resource monitoring are effectively solved, and the accuracy and continuity of monitoring data are remarkably improved.

The invention discloses a fish resource prediction method of female and male sex ratio change. The method comprises the following steps: constructing female and male gymnocypris przewalskii population vectors in a lake and a river of a target lake; calculating the population number of lakes and rivers every year; calculating the sex ratio of the gymnocypris przewalskii in lakes and rivers; calculating a repeated propagation coefficient; establishing a relationship between a river male-female ratio and a lake male-female ratio; and predicting the total resource quantity of the lake gymnocypris przewalskii in the future based on the relationship between the river male-female ratio and the lake male-female ratio and the repeated propagation coefficient. Based on the ecological habit of'lake inhabiting-river breeding 'of migratory fishes, accurate accounting of the population number is achieved by constructing the lake population vector and the river breeding population vector, the sex ratio feature, breeding coefficient and lake population cardinal number of the river breeding population are combined, the linkage logic of the population supplementation amount and the existing resource amount is more complete, and the breeding efficiency of the migratory fishes is improved. And the prediction error caused by data isolation is obviously reduced.

The application belongs to the technical field of bioengineering, and specifically discloses a single-domain antibody protein framework from freshwater stingray, which is derived from the variable region domain of heavy chain antibody IgNAR of the freshwater stingray, and the sequence composition is Leading Peptide, FR1, CDR1, FR2, HV, FR3, CDR3 and FR4 in sequence. The application uses the freshwater stingray as a research model, so that the development of the vNAR single-domain antibody technology can be free from the high threshold mode of relying on marine cartilaginous fish resources and seawater aquaculture facilities, the research and development cost of the single-domain antibody can be significantly reduced, the geographical threshold can be lowered, institutions located in non-coastal areas can also independently develop the vNAR, the development speed of the single-domain antibody technology can be improved, and the popularization and the expansion of the application radiation range of the single-domain antibody can be promoted.

The invention provides a fish resource quantity information evaluation device and system, and the device comprises a cruising main body which comprises a power part and a bearing part which are connected with each other, and the power part is used for driving the bearing part to cruise in a target water area; the trawl net is connected with the bearing part; in the advancing direction of the cruising main body, the front end of the trawl net is provided with a tour guide port for guiding fishes to swim in, and the rear end of the trawl net is provided with an escape port for allowing the fishes to escape; the image acquisition module is arranged on the bearing part; wherein the image acquisition module faces the trawl and is used for acquiring a plurality of fish images when fishes swim along the trawl, and the fish images are in approaching motion postures and water area backgrounds in the plurality of fish images. Through the device provided by the invention, the problems of poor imaging quality, weak environmental adaptability, complex operation and the like of the traditional non-invasive image acquisition equipment are solved.

The present application belongs to the technical field of fishery resource assessment, and provides a method for assessing fish population resource quantity. The method is based on multi-year daily scale fishery data and time corresponding environmental monitoring data, and differentiates the fish capture data and environmental factor data, and on this basis, an environmental response assessment model between fish population resource quantity and various environmental factors is constructed. The assessment model simultaneously reflects the linear influence and nonlinear response characteristics of environmental factors on fish population resource quantity, and the model parameters are determined using historical data, and after the parameters are determined, the fish population resource quantity of the same water area in different time periods can be continuously assessed. The method can effectively improve the stability and accuracy of fish resource quantity assessment, and is suitable for fish resource management and decision support in natural waters such as rivers, lakes and reservoirs.