Survey and sampling floating platform and quantitative evaluation method for fish in tidal creek during flood and ebb tides

Abstract

The present invention relates to the technical field of fish survey in tidal creeks. Disclosed are a survey and sampling floating platform and quantitative evaluation method for fish in a tidal creek during flood and ebb tides. The floating platform comprises a floating platform frame and survey and sampling nets, wherein each survey and sampling net comprises a net mouth welded by a galvanized pipe. In the present invention, by means of the provided floating platform, corresponding sampling fishing nets are respectively lowered for collection during flood and ebb tides, and flow meter data is read to calculate tidal water volume flow, such that aquatic organisms and nutrients in the tidal creek during the flood and ebb tides can be comprehensively collected, the deficiency of related data collection during flood tides in existing research is made up for, accurate monitoring and quantitative evaluation of tidal creek organisms and substance transfer are achieved, and the types, quantities and distributions of tidal creek organisms during the flood and ebb tides, and changes in tidal water flow can be comprehensively understood, thereby deeply understanding the situations of tidal creek organisms and substance transfer, and providing important data support and decision-making basis for related research and ecological protection.

Description

A floating platform for sampling and a quantitative evaluation method for fish investigation in tidal creek TECHNICAL FIELD

[0001] The present application relates to the technical field of tidal creek fish investigation, in particular to a floating platform for sampling and a quantitative evaluation method for fish investigation in tidal creek. BACKGROUND

[0002] As an important habitat type of estuarine salt marsh wetland, tidal creek provides a transport channel for aquatic organisms such as fish and various nutrients in and out of the estuarine salt marsh wetland. Under the action of periodic rising tide and falling tide, biological and nutrient elements are exchanged between the tidal creek and its adjacent patches. On the one hand, it provides a variety of habitat choices for fish spawning, foraging and refuge needs, and on the other hand, it improves the availability of wetland nutrient resources for fish communities. Therefore, researchers have shown great interest in the ecological function of tidal creek and have carried out a series of related researches to analyze the functional characteristics of tidal creek aquatic biological community, nutrient, connectivity, etc. It is generally believed that tidal creek provides a good foraging, growth, fattening and refuge place for estuarine aquatic organisms, especially small fish and juvenile fish, so that their populations show high abundance, growth rate and survival rate. Therefore, estuarine wetlands play an important role in juvenile habitat function.

[0003] However, due to the imperfect investigation and monitoring means, the current related researches mainly collect the fish catches entering the inserted net with tidal water during the falling tide by setting a fixed inserted net in the tidal creek after the tidal water recedes. However, due to the limitation of investigation methods, there is still a lack of detailed research on the substances and biological conditions entering the tidal creek with tidal water during the rising tide. There is also a lack of scientific method for quantitative evaluation of the biological and material transport during the rising and falling tides. Therefore, it is necessary to propose a floating platform for sampling and a quantitative evaluation method for fish investigation in tidal creek to solve the problems in the prior art. SUMMARY

[0004] The purpose of the present application is to make up for the shortcomings of the prior art, and provide a floating platform for sampling and a quantitative evaluation method for fish investigation in tidal creek. It can effectively investigate and sample during the rising and falling tides. The structure of the investigation and sampling net and the connection mode 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 during the rising and falling tides.

[0005] The present application provides the following technical solutions to solve the above technical problems: a floating platform for investigating and sampling fish in tidal gullies, comprising a floating platform frame and an investigation and sampling net, wherein the investigation and sampling net comprises a net mouth welded by a galvanized pipe, both ends of the net mouth welded by the galvanized pipe are provided with a circular ring bearing, the investigation and sampling net is connected with the floating platform frame through the galvanized pipe and the circular ring bearing, the net mouth of the investigation and sampling net is wound up and lowered through a nylon rope, the floating platform is built by a foam buoy, a galvanized pipe frame and a corrosion-resistant wood board, and is fixed in the tidal gully through anchors around the floating platform, and a group of iron rings are welded on the floating platform frame.

[0006] Further, a flow meter is installed at the net mouth of the investigation and sampling net, a nylon rope is installed on the outer surface of the net mouth of the investigation and sampling net, the nylon rope is fixed with the iron rings on the platform frame, and a fishing net piece is installed on the outer surface of the net mouth welded by the galvanized pipe.

[0007] Still further, a net bag is connected to the rear section of the investigation and sampling net, a group of stainless steel circular rings are installed in the net bag, and a fishing net piece is installed on each of the stainless steel circular rings to form a reverse whisker.

[0008] A quantitative evaluation method for fish in tidal gullies, which adopts the floating platform according to any one of claims 1-3, and the method comprises the following steps:

[0009] S1, building the floating platform: a 3m*4m floating platform is built by using a foam buoy, a galvanized pipe frame and a corrosion-resistant wood board, and is fixed in the tidal gully through anchors around the floating platform;

[0010] S2, assembling the investigation and sampling net: the net mouth welded by the galvanized pipe is assembled with the net to form the investigation and sampling net, a net bag is connected to the rear section of the net, and a flow meter and related connecting components are installed on the net mouth;

[0011] S3, preparing for investigation: all nets are erected on the platform before investigation to reduce water flow resistance and disturbance to aquatic organisms;

[0012] S4, investigating during the rising tide: the rising tide fishing net is lowered when the rising tide reaches a depth of 1.5m or more, the collected fish are collected after the net is pulled up, the flow meter data is read and related data is recorded;

[0013] S5, investigating during the ebbing tide: the ebbing tide fishing net is lowered when the ebbing tide occurs, the collected fish are collected after the net is pulled up, the flow meter data is read and related data is recorded;

[0014] S6, data analysis: the collected fish and the tidal flow data are analyzed and evaluated in detail to understand the biological and material transport conditions of the tidal gully, the ecological function and health status of the tidal gully are comprehensively evaluated, and data support and decision basis are provided for related research and ecological protection.

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

[0016] Prepare the foam float, galvanized pipe frame, corrosion-resistant wood board, iron ring and nylon cable materials;

[0017] Use the galvanized pipe to build the frame of the floating platform, with a size of 3m x 4m;

[0018] Install the foam float at the bottom of the frame to provide sufficient buoyancy to make the platform float on the water surface;

[0019] Lay the corrosion-resistant wood board on the top of the frame and install the anchor around the floating platform to fix the platform in the central position of the tidal creek through the anchor;

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

[0021] Further, the S2, the specific steps of assembling the investigation sampling net include:

[0022] Prepare the galvanized pipe welded net mouth, fishing net piece composed net cover, net bag, net mouth flow meter and connecting parts;

[0023] Assemble the galvanized pipe welded net mouth frame with the fishing net piece composed net cover, connect the net bag at the rear section of the net for containing the catch, and install the flow meter at the net mouth;

[0024] Fix the nylon rope with the iron ring on the platform frame and check whether each part of the investigation sampling net is firmly installed.

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

[0026] Check whether each part of the floating platform and the investigation sampling net is intact, and check the operation status of the anchor, cable and flow meter;

[0027] Place all the nets vertically on the floating platform and prepare the containers needed for collecting the catch;

[0028] Check the safety facilities on the floating platform, and the sampling personnel get on the floating platform when the tide is receding to prepare for the investigation;

[0029] Observe the environmental conditions of the tidal creek, including the rising and falling trend of the tidal water and the water flow speed, and reasonably arrange the investigation time and operation steps.

[0030] Further, the S4, the specific steps of the rising tide investigation include:

[0031] The sampling personnel closely observe the tidal water, and when the rising tide water depth reaches 1.5m or more, prepare for the next operation;

[0032] The rising tide fishnet is put down by the cable, and the fishnet enters the water smoothly and expands to the appropriate position;

[0033] During the rising tide, the fishnet collects aquatic organisms and nutrients entering with the tide water;

[0034] After the collection is completed, the fishnet is pulled up to the platform by the cable, and the catch in the net bag is carefully taken out and put into the prepared container;

[0035] The numbers before and after reading the net mouth flow meter are recorded, and the tidal flow through the net mouth is calculated according to the reading of the flow meter;

[0036] The species, quantity of catch and tidal flow data are recorded in detail.

[0037] Further, the specific steps of S5, the ebb tide investigation, include:

[0038] The sampling personnel closely observe the tidal water and wait for the ebb tide opportunity;

[0039] After the ebb tide begins, the ebb tide fishnet is put down by the cable to enter the water and expand;

[0040] During the ebb tide, the fishnet collects aquatic organisms and substances exiting with the tidal water;

[0041] After the collection is completed, the fishnet is pulled up to the platform by the cable, and the catch in the net bag is carefully taken out and put into the prepared container;

[0042] The data of the net mouth flow meter at this time are read and recorded, and the tidal flow through the net mouth is calculated according to the reading of the flow meter;

[0043] The species, quantity of catch and tidal flow data obtained by the ebb tide investigation are recorded in detail.

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

[0045] The species, quantity of catch and tidal flow data recorded in the rising tide investigation and the ebb tide investigation are sorted and classified;

[0046] The species and quantity of catch are counted, and the occurrence frequency and quantity distribution index of each fish species are calculated;

[0047] The change of tidal flow is analyzed, including the flow difference between the rising tide and the ebb tide, and the change trend of flow with time;

[0048] The correlation between the species and quantity of catch and the tidal flow is discussed to understand the relationship between the tidal gully biological and material transport.

[0049] Compared with the prior art, the floating platform for tidal channel tidal fish investigation sampling and the quantitative evaluation method have the following beneficial effects:

[0050] The floating platform is arranged, corresponding fishing nets are respectively lowered to collect at the rising tide and the falling tide, and the flow meter data is read to calculate the tidal flow, so that aquatic organisms and nutrients in the tidal channel at the rising tide and the falling tide can be comprehensively collected, the deficiency of the prior research in collecting relevant data at the rising tide is made up, accurate monitoring and quantitative evaluation of the biological and material transport of the tidal channel are realized, the types, quantity and distribution of the biological of the tidal channel and the differences between the rising tide and the falling tide are comprehensively understood, the conditions of the biological and material transport of the tidal channel are deeply understood, and important data support and decision basis are provided for relevant research and ecological protection.

[0051] Other advantages, objects and features of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0053] Fig. 1 is a structural schematic view of a floating platform for tidal channel rising and falling tide fish investigation sampling;

[0054] Fig. 2 is a structural schematic view of an investigation net in a floating platform for tidal channel rising and falling tide fish investigation sampling;

[0055] Fig. 3 is a flowchart of a quantitative evaluation method for tidal channel rising and falling tide fish.

[0056] In the figure: 1, investigation sampling net; 2, cable; 3, anchor; 4, floating platform frame; 5, foam float; 6, iron ring; 7, preservative wood board; 1-1, net opening; 1-2, ring bearing; 1-3, flow meter; 1-4, nylon rope; 1-5, fishing mesh; 1-6, stainless steel ring; 1-7, fishing mesh made into inverted whisker. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0058] Embodiment one

[0059] A floating platform for investigating and sampling fish in ebb and flow tide, comprising a floating platform frame (3m*4m) and an investigation and sampling net, the investigation and sampling net comprises a welded galvanized pipe mesh opening (1.5m*2.0m), both ends of the welded galvanized pipe mesh opening are provided with a circular ring bearing, the investigation and sampling net is connected with the floating platform frame through the galvanized pipe and the circular ring bearing, a flowmeter is installed at the mesh opening of the investigation and sampling net, a nylon rope is installed on the outer surface of the mesh opening of the investigation and sampling net, the nylon rope is fixed with an iron ring on the platform frame, a fishing mesh with a pore size of 2mm is installed on the outer surface of the welded galvanized pipe mesh opening, a net bag for containing fish is connected to the rear part of the investigation and sampling net, a group of stainless steel circular rings are installed in the net bag, the diameter of each stainless steel circular ring is 50cm, a fishing mesh is installed on each stainless steel circular ring to form a reverse fin to prevent the fish in the net from swimming out, the mesh opening of the investigation and sampling net is wound up and lowered through a cable, the floating platform is built by a foam buoy, a galvanized pipe frame and a corrosion-resistant wood board, and is fixed around the ebb and flow tide through an anchor, and a group of iron rings are welded on the floating platform frame.

[0060] By using the floating platform, all nets are erected on the platform before investigation, the sampling personnel get on the floating platform during ebb tide, when the depth of the rising tide reaches 1.5m or more, the rising tide fishing net is lowered through the cable, after the collection is completed, the fishing net is pulled up to the platform through the cable to collect the fish in the net bag, and the tide flow through the mesh opening is calculated by reading the numbers before and after the flowmeter, when the ebb tide comes, the ebb tide fishing net is lowered through the cable, after the collection is completed, the fishing net is pulled up to the platform through the cable to collect the fish in the net bag, and the tide flow through the mesh opening is calculated by reading the numbers before and after the flowmeter, so that the floating platform can effectively investigate and sample during the rising and ebbing tides, the structure of the investigation and sampling net and the connection mode 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 effect of the rising and ebbing tides.

[0061] Embodiment two

[0062] This embodiment further expands the use method of the embodiment one.

[0063] A method for quantitatively evaluating fish in ebb and flow tide, using the floating platform in the embodiment one, the method comprises:

[0064] First, a 3m x 4m floating platform is built with foam floats, galvanized pipe frames, and corrosion-resistant wood panels, and is anchored around the appropriate location of the tidal ditch to ensure stability and not be moved by the tide. The specific process includes: preparing foam floats, galvanized pipe frames, corrosion-resistant wood panels, iron rings, and nylon cable materials, using galvanized pipes to build the frame of the floating platform, ensuring that the frame structure is stable, with a size of 3m x 4m, installing foam floats at the bottom of the frame to provide sufficient buoyancy to make the platform float on the water surface, laying corrosion-resistant wood panels on the top of the frame to ensure that the corrosion-resistant wood panels are flat and firmly fixed on the frame, playing a role in leveling and anti-skid, installing anchors around the floating platform to fix the platform in the appropriate location of the tidal ditch to ensure that the platform will not move under the impact of the tide, after completing the construction, carefully check the stability and safety of the floating platform to ensure that it can meet the requirements of the investigation and sampling.

[0065] Then the galvanized pipe welded net mouth and the net are assembled into the investigation and sampling net, the net bag is connected at the rear section of the net, and the net mouth flow meter and related connecting components are installed to accurately measure the tidal flow. The specific process includes: preparing the galvanized pipe welded net mouth (1.5m x 2.0m), the net made of fishing mesh, the net bag, the net mouth flow meter, and the related connecting components, assembling the galvanized pipe welded net mouth frame with the net made of fishing mesh to ensure that the shape and size of the net mouth meet the requirements, connecting the net bag at the rear section of the net for containing the catch, installing the flow meter at the net mouth to ensure that the flow meter can accurately measure the tidal flow through the net mouth, fixing the nylon rope with the iron ring on the platform frame to ensure the stability of the fishing net operation, checking whether all the components of the investigation and sampling net are firmly installed and the net is intact to ensure that the investigation and sampling net can be used normally.

[0066] Then, all the nets are erected on the platform before the investigation to reduce water flow resistance and disturbance to aquatic organisms. The specific process includes: checking whether all the components of the floating platform and the investigation and sampling net are intact, checking the operation status of the anchors, cables, and flow meters, erecting all the nets on the floating platform to ensure that the nets are placed reasonably without affecting the stability of the platform and the operation space, and preparing containers needed for collecting the catch, checking the safety facilities on the floating platform such as guardrails to ensure the safety of the sampling personnel, the sampling personnel boarding the floating platform at ebb tide, making investigation preparations, the sampling personnel being familiar with the operation method of the cable, the reading of the flow meter, and the data recording method, observing the environmental conditions of the tidal ditch including the rising and falling trend of the tide and the water flow speed, and reasonably arranging the investigation time and operation steps.

[0067] Then, when the tidal water depth reaches more than 1.5m, the ebb tide net is lowered, the catch is collected after the collection is completed, the flow meter number is read and the tidal water flow is calculated, and the relevant data is recorded. The specific process includes: the sampling personnel closely observe the tidal water conditions, and when the tidal water depth reaches more than 1.5m, the next step is prepared to be operated, the ebb tide net is lowered through the cable, the net is smoothly put into the water and is unfolded to the appropriate position, the net is allowed to fully collect aquatic organisms and nutrients entering with the tidal water during the ebb tide, and when the collection is completed, the net is pulled up to the platform through the cable, the catch in the bag is carefully taken out and is put into the prepared container, the numbers before and after the flow meter at the net opening is read, and is recorded. According to the reading of the flow meter, the tidal water flow through the net opening is calculated, and the types, quantity and tidal water flow data of the catch are recorded in detail.

[0068] The ebb tide net is lowered when the ebb tide occurs, the catch is collected after the collection is completed, the flow meter data is read and the tidal water flow is calculated, and the relevant data is recorded. The specific process includes: the sampling personnel closely observe the tidal water conditions, and wait for the ebb tide opportunity, and when the ebb tide starts, the ebb tide net is lowered through the cable, and is put into the water and is unfolded. The net is allowed to collect aquatic organisms and substances exiting with the tidal water during the ebb tide, and when the collection is completed, the net is pulled up to the platform through the cable, the catch in the bag is taken out and is put into the corresponding container, the data of the flow meter at the net opening at this time is read and is recorded. According to the reading of the flow meter, the tidal water flow through the net opening is calculated, and the types, quantity and tidal water flow data of the catch obtained in the ebb tide investigation are recorded in detail.

[0069] Finally, the catch and tidal water flow data are analyzed and evaluated in detail to understand the biological and material transport in the tidal creek, the ecological function and health status of the tidal creek are comprehensively evaluated, data support and decision basis are provided for related research and ecological protection, and the specific process includes: the types, quantity and tidal water flow data of the catch recorded in the ebb tide investigation and the ebb tide investigation are sorted and classified, the types and quantity of the catch are counted, the occurrence frequency and quantity distribution index of each fish species are calculated, the change of the tidal water flow is analyzed, including the flow difference during the ebb tide and the ebb tide, the change trend of the flow with time, and the correlation between the types and quantity of the catch and the tidal water flow is discussed to understand the relationship between the biological and material transport in the tidal creek.

[0070] The Pearson correlation coefficient is used to calculate the correlation coefficient between the quantity of the catch and the tidal water flow to judge the correlation strength between them, for example: “the Pearson correlation coefficient between the quantity of the catch and the tidal water flow is calculated, according to the formula Where x i represents the observation value of the quantity of the catch, y i represents the observation value of the tidal water flow, And The average values of the catch quantity and the tidal flow are respectively represented, n represents the number of observation values, and the correlation coefficient r obtained by calculation can determine the correlation strength between the catch quantity and the tidal flow.

[0071] Through the above steps, the aquatic organisms and nutrients in the tidal ditch during the rising tide and the falling tide can be comprehensively collected, the deficiency of the existing research in collecting relevant data during the rising tide is made up, accurate monitoring and quantitative evaluation of the biological and material transport in the tidal ditch are realized, the species, quantity and distribution of the biological in the tidal ditch and the change of the tidal flow can be comprehensively understood, and the condition of the biological and material transport in the tidal ditch is deeply understood, thereby important data support and decision basis for relevant research and ecological protection are provided.

[0072] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments but can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of the essential characteristics of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A floating platform for tidal gully tidal fish survey sampling, comprising a floating platform frame and a survey sampling net, characterized in that, The investigation sampling net includes a net mouth welded by a galvanized pipe, both ends of the net mouth welded by the galvanized pipe are provided with a circular ring bearing, the investigation sampling net is connected with a floating platform frame through the galvanized pipe and the circular ring bearing, the net mouth of the investigation sampling net is wound up and lowered through a cable, the floating platform is built by a foam float, a galvanized pipe frame and a corrosion-resistant wood board, and is fixed in the center of a tidal creek through anchors around, and an iron ring is welded on the floating platform frame for fixing the cable.

2. The floating platform and quantitative evaluation method for tidal fish investigation sampling according to the tidal gully fluctuation of claim 1, characterized in that, A flowmeter is installed at the net mouth of the investigation sampling net, a nylon rope is installed on the outer surface of the net mouth of the investigation sampling net, the nylon rope is fixed with the iron ring on the platform frame, and a fishing net piece is installed on the outer surface of the net mouth welded by the galvanized pipe.

3. The floating platform and quantitative evaluation method for tidal gully tidal fishery investigation sampling according to claim 1, characterized in that, A net bag is connected to the rear section of the investigation sampling net, a group of stainless steel circular rings are installed in the net bag, and a fishing net piece is installed on each of the stainless steel circular rings.

4. A method for quantitative assessment of tidal fish in tidal creek fluctuation, using the floating platform according to any one of claims 1-3, characterized in that, The method comprises: S1, building a floating platform: a 3m*4m floating platform is built by using a foam float, a galvanized pipe frame and a corrosion-resistant wood board, and is fixed in the center of a tidal creek through anchors; S2, assembling the investigation sampling net: a net mouth welded by a galvanized pipe and a net are assembled into the investigation sampling net, a net bag is connected to the rear section of the net, and a net mouth flowmeter and related connecting components are installed; S3, preparing for investigation: all nets are erected on the platform before investigation to reduce water flow resistance and disturbance to aquatic organisms; S4, investigating during the rising tide: the rising tide fishing net is lowered when the rising tide water depth reaches 1.5m or more, the collected fishery products are collected after the collection is completed, the flowmeter numbers before and after the net is lowered are read, the tidal water flow is calculated, and related data are recorded; S5, investigating during the falling tide: the falling tide fishing net is lowered when the falling tide, the collected fishery products are collected after the collection is completed, the flowmeter data before and after the net is lowered are read, the tidal water flow is calculated, and related data are recorded; S6, data analysis: the fishery products and tidal water flow data are analyzed and evaluated in detail to understand the biological and material transport conditions of the tidal creek, the ecological function and health status of the tidal creek are comprehensively evaluated, and data support and decision basis are provided for related research and ecological protection.

5. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S1, building a floating platform, comprise: The foam float, the galvanized pipe frame, the corrosion-resistant wood board, the iron ring and the nylon cable are prepared; The galvanized pipe is used to build the frame of the floating platform, and the size is 3m*4m; The foam float is installed at the bottom of the frame to provide sufficient buoyancy to make the platform float on the water surface; The corrosion-resistant wood board is laid on the top of the frame, and the anchors are installed around the floating platform to fix the platform in the center of the tidal creek through the anchors; After the building is completed, the stability and safety of the floating platform are carefully checked.

6. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S2, assembling the investigation sampling net, comprise: The net mouth welded by the galvanized pipe, the net made of the fishing net piece, the net bag, the net mouth flowmeter and the connecting components are prepared; The net mouth frame welded by the galvanized pipe and the net made of the fishing net piece are assembled, the net bag is connected to the rear section of the net for containing the fishery products, and the flowmeter is installed at the net mouth; The nylon rope is fixed with the iron ring on the platform frame, and whether each component of the investigation sampling net is firmly installed is checked.

7. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S3, preparing for investigation, comprise: Check the status of the floating platform and the components of the sampling net, including the anchors, cables, and flow meters; Erect all nets on the floating platform and prepare the containers needed for collecting the catch; Check the safety facilities on the floating platform and have the sampling personnel board the platform during ebb tide to prepare for the investigation; Observe the environmental conditions of the tidal creek, including the rising and falling trend of the tidal water and the flow velocity, and arrange the investigation time and operation steps reasonably.

8. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S4, the rising tide investigation, include: The sampling personnel closely observe the tidal water and prepare for the next operation when the rising tide water depth reaches 1.5 m or above; Lower the rising tide net through the cable, and let the net enter the water smoothly and expand to the appropriate position; During the rising tide, let the net collect aquatic organisms and nutrients that enter with the tidal water; After the collection is completed, pull the net up to the platform through the cable, carefully take out the catch in the net bag, and put it into the prepared container; Read the numbers before and after the net mouth flow meter, record them, and calculate the tidal water flow through the net mouth according to the flow meter readings; Record the types and quantities of the catch and the tidal water flow data in detail.

9. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S5, the ebb tide investigation, include: The sampling personnel closely observe the tidal water and wait for the ebb tide opportunity; When the ebb tide begins, lower the ebb tide net through the cable, and let it enter the water and expand; During the ebb tide, let the net collect aquatic organisms and nutrients that exit with the tidal water; After the collection is completed, pull the net up to the platform through the cable, take out the catch from the net bag, and put it into the corresponding container; Read the numbers before and after the net mouth flow meter, record them, and calculate the tidal water flow through the net mouth according to the flow meter readings; Record the types and quantities of the catch and the tidal water flow data obtained during the ebb tide investigation in detail.

10. The method for quantitative evaluation of the fish in the tidal gully according to claim 4, characterized in that, The specific steps of S6, data analysis, include: Organize and classify the types and quantities of the catch and the tidal water flow data recorded during the rising tide and ebb tide investigations; Statistically analyze the types and quantities of the catch, and calculate the occurrence frequency and quantity distribution index of each fish species; Analyze the changes in the tidal water flow, including the flow difference between the rising tide and the ebb tide, and the flow change trend over time; Explore the correlation between the types and quantities of the catch and the tidal water flow to understand the relationship between the tidal creek organisms and the material transport.

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