A kind of tidal creek fluctuation tidal fish investigation sampling floating platform and quantitative evaluation method

Abstract

The application discloses a kind of tidal creek fluctuation tidal fish investigation sampling floating platform and quantitative evaluation method, it is related to tidal creek fish investigation technical field, floating platform includes floating platform frame and investigation sampling net, investigation sampling net includes by galvanized pipe welding net mouth.The floating platform of the present application is set down corresponding fishing net to collect respectively when rising tide and ebb tide, and reads the flowmeter data to calculate tidal water flow, can comprehensively collect aquatic organism and nutrient in tidal creek when rising tide and ebb tide, make up the deficiency of relevant data collection when rising tide of existing research, realize the accurate monitoring and quantitative evaluation of tidal creek biology and material transport, can comprehensively understand the species, quantity and distribution of tidal creek biology when rising tide and ebb tide, and the change of tidal flow, to understand the situation of tidal creek biology and material transport in depth, provide important data support and decision basis for relevant research and ecological protection.

Description

Technical Field

[0001] The invention relates to the technical field of tidal channel fish survey, and in particular to a floating platform for sampling and surveying tidal channel fish during high and low tides, and a quantitative evaluation method. Background Art

[0002] Tidal creeks, as an important habitat type in estuarine salt marsh wetlands, provide a transport channel for aquatic organisms such as fish and various nutrients to enter and exit estuarine salt marsh wetlands. Under the action of periodic high and low tides, biological and nutritional elements are exchanged between tidal creeks and their adjacent patches. On the one hand, they provide a variety of habitat options for fish communities to spawn, feed and seek refuge, and on the other hand, they increase the availability of wetland nutrient resources to fish communities. Therefore, scientific researchers have shown great interest in the ecological functions of tidal creeks and have carried out a series of related studies to analyze the functional characteristics of tidal creek aquatic communities, nutrients, connectivity, etc. It is generally believed that tidal creeks provide good feeding, growth, fattening and refuge places for estuarine aquatic organisms, especially small fish and juveniles, so that their populations show higher abundance, growth rate and survival rate. Therefore, estuarine wetlands play an important role as nurseries.

[0003] However, due to imperfect survey and monitoring methods, current research mainly relies on setting fixed nets in tidal channels and entering the channels after the tide recedes to collect fish caught during low tide. However, due to limitations in survey methods, detailed research on the substances and organisms that enter the tidal channels during high tide has been lacking. Furthermore, there is still a lack of scientific methods to quantitatively assess the biological and material transport effects of high and low tides. Therefore, it is necessary to propose a floating platform for surveying and sampling fish in tidal channels during high and low tides and a quantitative assessment method to address the problems of existing technologies. Summary of the Invention

[0004] The purpose of the present invention is to make up for the shortcomings of the existing technology and provide a floating platform for surveying and sampling fish in tidal channels during high and low tides and a quantitative evaluation method. The platform can conduct effective surveys and sampling at both high and low tides. The structure of the survey sampling net and the connection method with the floating platform make the collection of aquatic organisms and nutrients more comprehensive, providing a scientific basis for the quantitative evaluation of the biological and material transport effects of high and low tides.

[0005] In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: a floating platform for surveying and sampling fish in tidal creeks during high and low tides, comprising a floating platform frame and a survey and sampling net, wherein the survey and sampling net comprises a mesh opening welded by a galvanized pipe, and an annular bearing is installed at both ends of the mesh opening welded by the galvanized pipe. The survey and sampling net is connected to the floating platform frame via the galvanized pipe and the annular bearing, and the mesh opening of the survey and sampling net is folded up and lowered by rotating a nylon rope. The floating platform is constructed of a foam buoy, a galvanized pipe frame and anti-corrosion wooden boards, and is fixed in the tidal creek by anchors on all sides. A group of iron rings are welded to the floating platform frame.

[0006] Furthermore, a flow meter is installed at the mesh mouth of the survey sampling net, a nylon rope is installed on the outer surface of the mesh mouth of the survey sampling net, the nylon rope is fixed to the iron ring on the platform frame, and a fishing net is installed on the outer surface of the mesh mouth welded by a galvanized pipe.

[0007] Furthermore, the rear section of the survey sampling net is connected to a net bag, a group of stainless steel rings are installed inside the net bag, and each of the stainless steel rings is installed with a barb made of a fishing net.

[0008] A method for quantitatively assessing fish species during tidal fluctuations, using the floating platform according to any one of claims 1 to 3, the method comprising:

[0009] S1. Build a floating platform: Use foam buoys, galvanized pipe frames, and anti-corrosion wooden boards to build a 3m×4m floating platform, and anchor it in appropriate locations around the tidal creek.

[0010] S2. Assemble the survey sampling net: Assemble the mesh ports and netting of the galvanized pipe into the survey sampling net, connect the mesh bag to the rear end of the net, and install the mesh port flow meter and related connecting parts;

[0011] S3. Prepare for the survey: Before the survey, all nets should be erected and placed on the platform to reduce water resistance and disturbance to aquatic organisms;

[0012] S4. High tide survey: When the high tide water depth reaches 1.5m or more, lower the high tide fishing net. After the collection is completed, pull the net to collect the catch, read the flow meter number and record the relevant data;

[0013] S5. Low tide survey: lower the low tide fishing net at low tide, pull the net up to collect the catch after the collection is completed, read the flow meter data and record the relevant data;

[0014] S6. Data Analysis: Conduct detailed analysis and evaluation based on fish catch and tidal flow data to understand the biological and material transport conditions in tidal channels, comprehensively assess the ecological functions and health of tidal channels, and provide data support and decision-making basis for related research and ecological protection.

[0015] Furthermore, the specific steps of S1, building a floating platform, include:

[0016] Prepare foam floats, galvanized pipe frames, anti-corrosion wooden boards, iron rings and nylon Range Rover cable materials;

[0017] Use galvanized pipes to build the frame of the floating platform, with dimensions of 3m x 4m;

[0018] Install foam floats on the bottom of the frame to provide enough buoyancy to keep the platform afloat;

[0019] Anti-corrosion wood boards are laid on the top of the frame, and anchors are installed around the floating platform to fix the platform in the center of the tidal creek;

[0020] After completing the construction, carefully check the stability and safety of the floating platform.

[0021] Furthermore, the specific steps of S2, assembling the survey sampling network, include:

[0022] Prepare the galvanized pipe welded mesh, the fishing net, the mesh bag, the mesh flow meter and the connecting parts;

[0023] Assemble the galvanized pipe welded mesh frame and the fishing net made of mesh sheets, connect the net bag to the rear part of the net to hold the catch, and install a flow meter at the mesh mouth;

[0024] Fix the nylon rope to the iron ring on the platform frame and check whether all parts of the survey sampling network are firmly installed.

[0025] Furthermore, the specific steps of S3, preparing for investigation, include:

[0026] Check whether all parts of the floating platform and survey sampling network are intact, and check the operating status of anchors, cables, and flow meters;

[0027] Put all the nets upright on the floating platform and prepare the necessary containers to collect the catch;

[0028] Check the safety facilities on the floating platform, and the sampling personnel will board the floating platform at low tide to prepare for the investigation;

[0029] Observe the environmental conditions of the tidal creek, including the rise and fall of the tide and the speed of the water flow, and arrange the investigation time and operation steps reasonably.

[0030] Furthermore, the specific steps of S4, high tide investigation, include:

[0031] The sampling personnel closely monitor the tide conditions and prepare for the next step when the high tide depth reaches 1.5m or more;

[0032] The high tide net is lowered by a cable, the net enters the water smoothly and is unfolded to the appropriate position;

[0033] During high tide, the fishing nets can fully collect aquatic organisms and nutrients that enter with the tide;

[0034] When the collection is completed, the fishing net is pulled onto the platform by the cable, and the catch in the net bag is carefully taken out and placed in the prepared container;

[0035] Read the numbers before and after the network port flow meter, record them, and calculate the tidal water flow through the network port based on the flow meter readings;

[0036] Detailed records of catch type, quantity, and tidal flow data were kept.

[0037] Furthermore, the specific steps of the S5, low tide investigation, include:

[0038] The sampling personnel closely observed the tide conditions and waited for the low tide;

[0039] When the tide starts to recede, the low tide net is lowered by a cable, so that it enters the water and unfolds;

[0040] During low tide, allow the nets to collect aquatic organisms and materials as they exit with the tide;

[0041] After the collection is completed, the fishing net is pulled onto the platform by the cable, the catch is taken out of the net bag and placed in the corresponding container;

[0042] Read the data of the network port flow meter at this time and record it. According to the reading of the flow meter, calculate the tidal flow through the network port;

[0043] The types and quantities of fish caught during the low tide survey as well as the tidal flow data were recorded in detail.

[0044] Furthermore, the specific steps of S6, data analysis, include:

[0045] Organize and categorize the types and quantities of fish caught and tidal flow data recorded during high tide and low tide surveys;

[0046] Statistics were made on the types and quantities of fish caught, and the frequency of occurrence and quantity distribution indicators of each fish were calculated;

[0047] Analyze the changes in tidal flow, including the difference in flow during high tide and low tide, and the trend of flow over time;

[0048] To explore the correlation between the species and quantity of fish catch and tidal discharge in order to understand the relationship between tidal channel organisms and material transport.

[0049] Compared with the existing technology, the floating platform for surveying and sampling fish at high and low tides in tidal creeks and the quantitative assessment method have the following beneficial effects:

[0050] The present invention sets up a floating platform, lowers corresponding fishing nets for collection at high tide and low tide, and reads flow meter data to calculate tidal flow. It can comprehensively collect aquatic organisms and nutrients in tidal channels at high tide and low tide, making up for the shortcomings of existing research on relevant data collection at high tide, realizing accurate monitoring and quantitative evaluation of tidal channel organisms and material transport, and can fully understand the types, number and distribution of tidal channel organisms and their differences in high tide and low tide, so as to gain an in-depth understanding of the situation of tidal channel organisms and material transport, providing important data support and decision-making basis for related research and ecological protection.

[0051] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0053] Figure 1 This is a schematic diagram of the structure of a floating platform for surveying and sampling fish in tidal channels during high and low tides;

[0054] Figure 2 This is a schematic diagram of the structure of a survey net used in a floating platform for surveying and sampling fish in tidal channels during high and low tides;

[0055] Figure 3 Schematic diagram of a process for quantitative assessment of fish species in tidal channels during high and low tides.

[0056] In the figure: 1. Survey sampling net; 2. Cable; 3. Anchor; 4. Floating platform frame; 5. Foam buoy; 6. Iron ring; 7. Anti-corrosion wooden board; 1-1. Net mouth; 1-2. Ring bearing; 1-3. Flow meter; 1-4. Nylon rope; 1-5. Fishing net; 1-6. Stainless steel ring; 1-7. Inverted barbel made of fishing net. DETAILED DESCRIPTION

[0057] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0058] A floating platform for surveying and sampling fish at high and low tides in tidal creeks, comprising a floating platform frame (3m×4m) and a survey sampling net, wherein the survey sampling net comprises a mesh opening (1.5m×2.0m) welded by galvanized pipes, both ends of which are equipped with annular bearings, the survey sampling net is connected to the floating platform frame via the galvanized pipes and the annular bearings, a flow meter is installed at the mesh opening of the survey sampling net, a nylon rope is installed on the outer surface of the mesh opening of the survey sampling net, the nylon rope is fixed to the iron ring on the platform frame, and the mesh opening welded by the galvanized pipes is connected to the floating platform frame via the galvanized pipes and the annular bearings, and a flow meter is installed at the mesh opening of the survey sampling net. The outer surface of the net mouth is installed with a fishing net with an aperture of 2mm. The rear part of the survey sampling net is connected to a net bag to hold the catch. A group of stainless steel rings are installed inside the net bag. The diameter of the stainless steel ring is 50cm. Each stainless steel ring is installed with a barbed wire made of fishing net to prevent the catch that enters the net from swimming out. The net mouth of the survey sampling net is folded up and lowered by rotating the cable. The floating platform is constructed by foam buoys, galvanized pipe frames and anti-corrosion wooden boards. It is fixed around the tidal ditch by anchors. A group of iron rings are welded to the floating platform frame.

[0059] When using the above-mentioned floating platform, all nets are erected and placed on the platform before the survey. Sampling personnel board the floating platform at low tide. When the high tide water depth reaches more than 1.5m, the high tide fishing net can be lowered by the cable. After the collection is completed, the fishing net is pulled onto the platform by the cable to collect the catch in the net bag, and the numbers before and after the flow meter are read to calculate the tidal flow through the net port. When the tide is low, the low tide fishing net can be lowered by the cable. After the collection is completed, the fishing net is pulled onto the platform by the cable to collect the catch in the net bag, and the numbers before and after the flow meter are read to calculate the tidal flow through the net port. This allows the floating platform to conduct effective surveys and sampling at both high and low tides. The structure of the survey sampling net and the connection method with the floating platform make the collection of aquatic organisms and nutrients more comprehensive and provide a scientific basis for the quantitative evaluation of the biological and material transport effects of high and low tides. Example

[0060] This embodiment further expands the usage method of the first embodiment in detail.

[0061] A method for quantitatively assessing fish species during tidal fluctuations, using the floating platform of the first embodiment, comprising:

[0062] First, a 3m×4m floating platform is built with foam buoys, galvanized pipe frames and anti-corrosion wooden boards, and fixed in appropriate positions around the tidal ditch with anchors to ensure that the platform is stable and will not be moved by the tide. The specific process includes: preparing foam buoys, galvanized pipe frames, anti-corrosion wooden boards, iron rings and nylon Range Rover cable materials, using galvanized pipes to build the frame of the floating platform, ensuring that the frame structure is stable and the size is 3m×4m, installing foam buoys at the bottom of the frame to provide sufficient buoyancy so that the platform floats on the water, laying anti-corrosion wooden boards on the top of the frame, ensuring that the anti-corrosion wooden boards are flat and firmly fixed to the frame to play a flat and anti-slip role, installing anchors around the floating platform, and fixing the platform in appropriate positions in the tidal ditch with anchors to ensure that the platform will not move under the impact of the tide. After the construction is completed, carefully check the stability and safety of the floating platform to ensure that it can meet the requirements of the survey and sampling.

[0063] Then, assemble the galvanized pipe welded mesh and net to form a survey sampling net, connect the net bag to the rear end of the net, and install the mesh flow meter and related connecting parts to accurately measure the tidal flow. The specific process includes: preparing the galvanized pipe welded mesh (1.5m×2.0m), the net composed of fishing mesh, the net bag, the mesh flow meter and related connecting parts; assemble the galvanized pipe welded mesh frame and the net composed of fishing mesh to ensure that the shape and size of the mesh meet the requirements; connect the net bag to the rear end of the net to hold the catch; install the flow meter at the mesh mouth to ensure that the flow meter can accurately measure the tidal flow through the mesh mouth; fix the nylon rope to the iron ring on the platform frame to ensure the operational stability of the fishing net; check whether the various components of the survey sampling net are firmly installed and whether the net is intact to ensure that the survey sampling net can be used normally;

[0064] Next, before the survey, all nets were erected and placed on the platform to reduce water resistance and interference with aquatic life. The specific process included: checking whether the various components of the floating platform and the survey sampling net were intact, checking the operating status of the anchor, cable, and flow meter, erecting all nets on the floating platform, ensuring that the nets were placed in a reasonable position and did not affect the stability of the platform and the operating space, and preparing the containers needed to collect the catch, checking the safety facilities on the floating platform, such as guardrails, etc., to ensure the safety of the sampling personnel. The sampling personnel boarded the floating platform at low tide and prepared for the survey. The sampling personnel were familiar with the operation of the cable, as well as the reading and data recording methods of the flow meter, and observed the environmental conditions of the tidal creek, including the rise and fall of the tide and the water flow speed, and reasonably arranged the survey time and operation steps.

[0065] Then, when the depth of the high tide reaches more than 1.5m, the high tide fishing net is lowered. After the collection is completed, the net is pulled up to collect the catch, the flow meter numbers are read and the tidal flow is calculated, and the relevant data is recorded. The specific process includes: the sampling personnel closely observe the tide conditions. When the depth of the high tide reaches more than 1.5m, they are ready to proceed to the next step. The high tide fishing net is lowered by the cable. The fishing net enters the water smoothly and is unfolded to the appropriate position. During the high tide, the fishing net is allowed to fully collect the aquatic organisms and nutrients that enter with the tide. When the collection is completed, the fishing net is pulled onto the platform by the cable, and the catch in the net bag is carefully taken out and placed in the prepared container. The numbers before and after the net mouth flow meter are read and recorded. According to the reading of the flow meter, the tidal flow through the net mouth is calculated, and the type and quantity of the catch and the tidal flow data are recorded in detail.

[0066] The low tide fishing net is lowered at low tide. After the collection is completed, the net is pulled up to collect the catch, the flow meter data is read, the tidal flow is calculated, and the relevant data is recorded. The specific process includes: the sampling personnel closely observe the tide conditions and wait for the low tide. When the tide begins to low, the low tide fishing net is lowered by the cable, so that it enters the water and unfolds. During the low tide, the fishing net is allowed to collect aquatic organisms and substances that retreat with the tide. After the collection is completed, the fishing net is pulled onto the platform by the cable, the catch is taken out of the net bag and placed in the corresponding container, the data of the net port flow meter at this time is read and recorded, and the tidal flow through the net port is calculated according to the flow meter reading, and the type and quantity of the catch and the tidal flow data obtained from the low tide survey are recorded in detail.

[0067] Finally, a detailed analysis and evaluation is conducted based on the data on fish catch and tidal water flow to understand the situation of tidal creek organisms and material transport, comprehensively evaluate the ecological functions and health status of tidal creeks, and provide data support and decision-making basis for related research and ecological protection. The specific process includes: organizing and classifying the types and quantities of fish catch and tidal water flow data recorded in the high tide survey and low tide survey, counting the types and quantities of fish catch, calculating the occurrence frequency and quantity distribution indicators of each fish species, analyzing the changes in tidal water flow, including the difference in flow at high tide and low tide, and the change trend of flow over time, and exploring the correlation between the types and quantities of fish catch and tidal water flow, so as to understand the relationship between tidal creek organisms and material transport.

[0068] Use the Pearson correlation coefficient to calculate the correlation coefficient between the number of fish caught and the tidal flow to determine the strength of the correlation between them, for example: "Calculate the Pearson correlation coefficient between the number of fish caught and the tidal flow, according to the formula ,in represents the observed value of the number of fish caught, represents the observed value of tidal water flow, and They represent the average values ​​of the number of fish caught and the tidal flow, respectively, and n represents the number of observations. The correlation coefficient r obtained by calculation can be used to determine the strength of the correlation between the number of fish caught and the tidal flow.

[0069] Through the above steps, we can comprehensively collect aquatic organisms and nutrients in tidal creeks at high tide and low tide, which makes up for the shortcomings of existing research in collecting relevant data at high tide, realizes accurate monitoring and quantitative evaluation of tidal creek organisms and material transport, and can fully understand the types, number and distribution of tidal creek organisms, as well as changes in tidal flow, so as to gain an in-depth understanding of the situation of tidal creek organisms and material transport, providing important data support and decision-making basis for related research and ecological protection.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and scope of the same elements of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for quantitatively assessing fish species during tidal fluctuations, characterized in that: The assessment method uses a tidal creek fish survey and sampling floating platform for assessment, and the floating platform includes: a floating platform frame and a survey sampling net; The survey sampling net includes a mesh mouth welded from galvanized pipes, with annular bearings installed at both ends of the mesh mouth welded from galvanized pipes. The survey sampling net is connected to the floating platform frame via the galvanized pipes and the annular bearings. The mesh mouth of the survey sampling net is folded up and lowered by rotating cables. The rear section of the survey sampling net is connected to a net bag, a group of stainless steel rings are installed inside the net bag, and each of the stainless steel rings is installed with a fishing net bark. The floating platform is constructed from a foam buoy, a galvanized pipe frame, and anti-corrosion wooden boards, and is fixed to the tidal ditch by anchors. A group of iron rings are welded to the floating platform frame. A flow meter is installed at the mesh opening of the survey sampling net, a nylon rope is installed on the outer surface of the mesh opening of the survey sampling net, the nylon rope is fixed to the iron ring on the platform frame, and a fishing net is installed on the outer surface of the mesh opening welded by the galvanized pipe; The evaluation method includes: S1. Build a floating platform: Use foam buoys, galvanized pipe frames, and anti-corrosion wooden boards to build a 3m×4m floating platform, and anchor it in appropriate locations around the tidal creek. S2. Assemble the survey sampling net: Assemble the mesh ports and netting of the galvanized pipe into the survey sampling net, connect the mesh bag to the rear end of the net, and install the mesh port flow meter and related connecting parts; S3. Prepare for the survey: Before the survey, all nets should be erected and placed on the platform to reduce water resistance and disturbance to aquatic organisms; S4. High tide survey: When the high tide water depth reaches 1.5m or more, lower the high tide fishing net. After the collection is completed, pull the net to collect the catch, read the flow meter number and calculate the tidal water flow, and record the relevant data; S5. Low tide survey: lower the low tide fishing net at low tide, pull the net up to collect the catch after the collection is completed, read the flow meter data and calculate the tidal water flow, and record the relevant data; S6. Data Analysis: Conduct detailed analysis and assessment based on fish catch and tidal flow data to understand the biological and material transport conditions in tidal channels, comprehensively assess the ecological functions and health of tidal channels, and provide data support and decision-making basis for related research and ecological protection; The specific steps of S6, data analysis include: Organize and categorize the types and quantities of fish caught and tidal water flow data recorded during high tide and low tide surveys; Statistics were made on the types and quantities of fish caught, and the frequency of occurrence and quantity distribution indicators of each fish were calculated; Analyze the changes in tidal water flow, including the difference in flow during high tide and low tide, and the change trend of flow over time; To explore the correlation between the species and quantity of fish catch and tidal water flow, and to understand the relationship between tidal channel organisms and material transport.

2. A method for quantitatively assessing fish species during tidal fluctuations according to claim 1, characterized in that: The specific steps of S1, building the floating platform, include: Prepare foam floats, galvanized pipe frames, anti-corrosion wooden boards, iron rings and nylon Range Rover cable materials; Use galvanized pipes to build the frame of the floating platform, with dimensions of 3m x 4m; Install foam floats on the bottom of the frame to provide enough buoyancy to keep the platform afloat; Anti-corrosion wood boards are laid on the top of the frame, and anchors are installed around the floating platform to fix the platform in appropriate positions around the tidal creek; After completing the construction, carefully check the stability and safety of the floating platform.

3. A method for quantitatively assessing fish species during tidal fluctuations according to claim 1, characterized in that: The specific steps of S2, assembling the survey sampling network, include: Prepare the galvanized pipe welded mesh, the fishing net, the mesh bag, the mesh flow meter and the connecting parts; Assemble the galvanized pipe welded mesh frame and the fishing net made of mesh sheets, connect the net bag to the rear part of the net to hold the catch, and install a flow meter at the mesh mouth; Fix the nylon rope to the iron ring on the platform frame and check whether all parts of the survey sampling network are firmly installed.

4. A method for quantitatively assessing fish species during tidal fluctuations according to claim 1, characterized in that: The specific steps of S3, preparing for investigation, include: Check whether all parts of the floating platform and survey sampling network are intact, and check the operating status of anchors, cables, and flow meters; Put all the nets upright on the floating platform and prepare the necessary containers to collect the catch; Check the safety facilities on the floating platform, and the sampling personnel will board the floating platform at low tide to prepare for the investigation; Observe the environmental conditions of the tidal creek, including the rise and fall of the tide and the speed of the water flow, and arrange the investigation time and operation steps reasonably.

5. The method for quantitatively assessing fish species during tidal fluctuations according to claim 1, wherein: The specific steps of S4, high tide investigation, include: The sampling personnel closely monitor the tide conditions and prepare for the next step when the high tide depth reaches 1.5m or more; The high tide net is lowered by a cable, the net enters the water smoothly and is unfolded to the appropriate position; During high tide, the fishing nets can fully collect aquatic organisms and nutrients that enter with the tide; When the collection is completed, the fishing net is pulled onto the platform by the cable, and the catch in the net bag is carefully taken out and placed in the prepared container; Read the numbers before and after the network port flow meter, record them, and calculate the tidal water flow through the network port based on the flow meter readings; The types and quantities of fish caught as well as tidal flow data were recorded in detail.

6. A method for quantitatively assessing fish species during tidal fluctuations according to claim 1, characterized in that: The specific steps of the S5 low tide survey include: The sampling personnel closely observed the tide conditions and waited for the low tide; When the tide starts to recede, the low tide net is lowered by a cable, so that it enters the water and unfolds; During low tide, allow the nets to collect aquatic organisms and materials as they exit with the tide; After the collection is completed, the fishing net is pulled onto the platform by the cable, the catch is taken out of the net bag and placed in the corresponding container; Read the data of the network port flow meter at this time and record it. According to the reading of the flow meter, calculate the tidal water flow through the network port; The types and quantities of fish caught during the low tide survey as well as the tidal water flow data were recorded in detail.

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