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CN-121998196-A - Optimal deployment method for near-shore ocean fishery resource net-penetrating investigation

CN121998196ACN 121998196 ACN121998196 ACN 121998196ACN-121998196-A

Abstract

The invention relates to an optimized arrangement method for near-shore marine fishery resource net-penetrating investigation, which belongs to the technical field of marine fishery resource investigation, and the method of the invention is characterized in that the net-penetrating specification, the arrangement time length, the segmentation mode, the time period selection and the sampling area layout are scientifically set, the method solves the technical problems of obvious capture accumulation effect, incomplete type coverage, low fishing yield, low data standardization degree and the like in the existing stab net investigation. The method adopts a distribution mode (4 h multiplied by 3) with total duration of 12 h and each 4h in 3 time intervals, can obviously improve the fishing yield, enhance the coverage of the types of fishery resources in investigation water areas, truly reflect the community structure composition, provide a scientific and feasible technical scheme for the offshore marine fishery resource investigation standardization, and is suitable for fishery resource investigation work of the coastal shallow sea in Laozhou and similar temperate zones, marine pasture demonstration areas and other sea areas.

Inventors

  • LI ZHONGYI
  • WANG HUIBIN

Assignees

  • 中国水产科学研究院黄海水产研究所

Dates

Publication Date
20260508
Application Date
20260204

Claims (5)

  1. 1. The method is characterized by comprising the steps of selecting a stab net, determining a survey area, setting a setting mode, distributing a sampling area, recovering the stab net and carrying out data statistics; the said gill net is selected by using gill net with inner and outer double layer structure, wherein the outer net aperture is 35 cm, the inner net aperture is 5.6 cm, the gill net has a specification of 130: 130 m ×10: 10m The investigation region is determined by selecting a region which is homogenized by hydrologic conditions in an offshore area; the arrangement mode is set, namely a segmented arrangement mode with the total duration of 12 h is adopted, the arrangement mode is specifically divided into 3 time periods, the arrangement duration of each time period is 4 h, and each time period is arranged in different sampling areas, so that the interference of the preamble network times on the follow-up investigation is avoided; The sampling area layout is that the distance between the sampling areas of two adjacent time periods is set to be 2-3 nmile in order to avoid the interference of the preamble network times; And (3) the barbed wire recovery and data statistics, namely timely recovering the barbed wire after the arrangement of each period is finished, counting the type, quality and quantity information of the fishery winnings at each station, calculating the quality fishery winnings rate and the quantity fishery winnings rate, and carrying out data processing.
  2. 2. An optimized placement method for near-shore marine fishery resource puncture surveys as claimed in claim 1, wherein 4 repeated stations are provided in each time period, and the station spacing is about 1 nmile.
  3. 3. An optimized deployment method for near-shore marine fishery resource penetration investigation according to claim 1, wherein the data processing process is as follows: (1) Data standardization, namely after the original data of the resource quantity is standardized by fourth-time root conversion, screening the types of which the resource quantity of each station is more than or equal to 3 percent of the total resource quantity, and eliminating rare types; (2) The normalization test, namely obtaining the species number of the fishery resources aiming at each station net, and verifying the normalization of the data; (3) Statistical analysis, namely analyzing community type similarity by adopting a Jaccard type composition similarity coefficient, comparing community structure differences by ANOSIM similarity analysis, analyzing the fishing yield heterogeneity of the same mode in different periods by utilizing Friedman non-parametric test, and comparing the fishing efficiency differences of different distribution modes by adopting Wilcoxon rank sum test; (4) The data were subjected to a difference significance analysis.
  4. 4. The method for optimizing deployment of a near-shore marine fishery resource puncture survey according to claim 1, wherein the near-shore is a near-shore shallow sea in the bay of lycra and similar temperate zones.
  5. 5. An optimized deployment method for near-shore marine fishery resource puncture investigation according to claim 3, wherein Shapiro-Wilk or Kolmogorov-Smirnov is adopted to verify data normalization.

Description

Optimal deployment method for near-shore ocean fishery resource net-penetrating investigation Technical Field The invention relates to the technical field of marine fishery resource investigation, in particular to an optimized arrangement method for near-shore marine fishery resource net penetration investigation. Background In recent years, near-shore marine economy such as the industry of the harbor, the land making in the sea, the nuclear power engineering, the shipping industry, the marine pasture and the like rapidly develop, and the fishery resource investigation and evaluation become an important foundation for the sea-related engineering criticization and the marine pasture construction. The stab net is used as a passive selective net tool with simple operation and controllable deviation, is the most commonly used tool for the current offshore marine fishery resource investigation, but the current stab net investigation method has a plurality of technical defects, and seriously affects the accuracy and the standardization degree of investigation data. On the one hand, the capture efficiency of the stab net has the difference of species selectivity, the probability of capturing organisms with strong swimming capability and irregular body type is high, and the capture efficiency of small individuals with weak swimming capability is low. The extension of the deployment time can raise the capture rate of some species, but can cause the capture accumulation effect, i.e. as the fish-winning material accumulates on the net, the net effective capture space is reduced, and the struggle signal of the captured organisms can promote the avoidance of surrounding organisms, resulting in the reduction of the fish-winning rate per unit time. Related researches show that the barbed wire net laying duration and the fishing yield show typical nonlinear dynamic relation, the fishing yield gradually increases along with time in the initial laying stage, but the fishing yield gradually tends to be stable due to the fact that fish escape, evading behavior accumulation and net holding capacity reach the upper limit in the later stage. On the other hand, the fishing efficiency of the stab net is influenced by the combination of factors such as the laying time period, the time length, the tide period, the day and night, and the like, and no unified standard system for the laying time length and the time period exists at home and abroad at present. The domestic thorn net laying time difference is large, the offshore is mainly 12-16 h continuous operation, the offshore and fresh water areas have 1-3 h short-time operation and even 8d operation, and part of research has definite time periods but the scheme is not uniform, so that investigation data lacks comparability, and real condition of fishery resources is difficult to accurately reflect. In addition, sensory systems such as vision, hearing, smell and the like of fish can sense that a stab net exists and trigger avoidance behaviors, so that investigation deviation is further aggravated. The fish vision system is extremely sensitive to illumination intensity change, the illumination gradient in the day-night transition period can directly drive the vertical and horizontal migration behaviors of the fish, the fish activity is more active in this stage, the existing arrangement mode is difficult to cover the fish community characteristics in this period, and the problems of incomplete category coverage, inaccurate community structure characterization and the like are caused. Therefore, there is a need for a method of deployment of a stab net that balances capture efficiency with accumulation effects, covers critical periods, and is highly standardized to improve accuracy and reliability of offshore marine fishery resource surveys. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides an optimized arrangement method for the near-shore marine fishery resource stab net investigation, solves the problems of obvious capture accumulation effect, insufficient type coverage, low fishing win rate, low data standardization degree and the like in the prior art by scientifically setting stab net parameters, arrangement modes and data statistics methods, and provides technical support for the near-shore marine fishery resource investigation standardization. In order to achieve the above purpose, the invention adopts the following technical scheme: An optimized arrangement method for near-shore marine fishery resource stab net investigation comprises the steps of stab net selection, investigation region determination, arrangement mode setting, sampling region layout, stab net recovery and data statistics; The stab net is selected from inner and outer double-layer structure, wherein the outer net aperture is 35 cm, the inner net aperture is 5.6 cm, and the stab net has a length of 130 m ×10 m. The stab net with the specification can meet the capturing