Fish body length distribution frequency-based fishery resource quantity survey method

Abstract

The invention discloses a fish body length distribution frequency-based fishery resource quantity survey method. The method includes the following steps that: 1) the body length-weight regression equations of various kinds of investigation objects are obtained through fitting according to survey literature materials or accumulated data; 2) the weight WSiLj of various kinds of fishes in different body length group specifications is calculated according to the body length-weight regression equations; 3) when survey is conducted in the field, the total number of actual fishing vessels, annual mean fishing days D and the number m of vessels under sampling survey in a surveyed river section are obtained emphatically, and the number NSiLj of the survey objects in each body length group is put into statistics; and 4) and the total weight of various kinds of fishes of the vessels under sampling survey can be estimated according to the number of the individuals in each body length group and the weight of the individuals in the corresponding specification, wherein the total weight Wsi of the i-th kind of fishes can be obtained according to an equation that Wsi=NSiL1*WSiL1+NSiL2*WSiL2+NSiL3*WSiL3...+NSiLn*WSiLn, wherein n is a natural number greater than 1; and 5) the total weight of each kind of fishes is added together, so that the total quantity Wt of fishery resources in the surveyed water can be obtained, wherein Wt can be expressed by an equation described in the descriptions in the invention. The survey method of the invention is economical, convenient, accurate and reliable and has high repeatability. With the method adopted, the workload in a fishery survey statistical process can be greatly decreased.

Description

technical field

[0001] The invention relates to a method for investigating fish growth, in particular to a method for investigating fishery catch resources based on fish body length distribution frequency. Background technique

[0002] Carrying out river fishery fishing survey is one of the important contents of fish resources conservation. Through investigation to find out the amount of fishery catch resources, and then analyze its inter-annual changes can provide a scientific basis for fishery management and fish resource protection. In order to estimate the amount of fishery catch resources accurately, a large number of surveys must be carried out. In the case of insufficient data, there will be large errors in the estimated amount of resources. This is mainly due to the fact that many fish species have the characteristics of migration or migration, and the species and quantity of fish will change significantly in different periods of time in a specific water area. There...

Examples

Embodiment 1

[0018] Example 1 Survey on fishery catch resources of the Pearl River "Four Famous and Precious Rivers" in Guiping Qianjiang River Section

[0019] In order to investigate the fishery resources of the Pearl River's "four famous and precious river delicacies" - perch, rollmouth, spotted squid and big-eyed mandarin fish in the Qianjiang section of Guiping, the historical data obtained by the laboratory's investigation in the middle and lower reaches of the Pearl River were first used , and sorted out the body length-weight relationship equations of the four fish species in the Pearl River, as shown in Table 1, where the body length unit is centimeter (cm) and the body weight unit is gram (g). And the original data basically covered the body length distribution range of the four fishes in the research waters, and the correlation coefficient of the regression equation R 2 All above 0.8, the regression is valid.

[0020] Table 1. The body length-weight relationship equation of the...

Embodiment 2

[0031] Example 2 Guangdong bream fishery catch resources survey

[0032] Cantonese bream is one of the most important economic fishes in the middle and lower reaches of the Pearl River. It is widely distributed in the Zhaoqing-Fengkai section. According to the historical data obtained from the survey, the body length-weight relationship equation of Cantonese bream is as follows: W=0.0156L 3.0846 (R2=0.9744), where the unit of body length is centimeter (cm), and the unit of body weight is gram (g).

[0033] 2) According to the body length-weight relationship equation, according to the interval of 5cm, the body weight indicators of different body length specifications of Cantonese bream were estimated, and included in Table 4;

[0034] Table 4. The body weight of different specifications of Guangdong bream in the Pearl River

[0035] Body length cm 5 10 15 20 25 30 35 40 weight g 2 19 66 161 320 562 904 1364

[0036] 3) In March, June and Se...

technical field

[0001] The invention relates to a method for investigating fish growth, in particular to a method for investigating fishery catch resources based on fish body length distribution frequency. Background technique

[0002] Carrying out river fishery fishing survey is one of the important contents of fish resources conservation. Through investigation to find out the amount of fishery catch resources, and then analyze its inter-annual changes can provide a scientific basis for fishery management and fish resource protection. In order to estimate the amount of fishery catch resources accurately, a large number of surveys must be carried out. In the case of insufficient data, there will be large errors in the estimated amount of resources. This is mainly due to the fact that many fish species have the characteristics of migration or migration, and the species and quantity of fish will change significantly in different periods of time in a specific water area. There...

Examples

Embodiment 1

[0018] Example 1 Survey on fishery catch resources of the Pearl River "Four Famous and Precious Rivers" in Guiping Qianjiang River Section

[0019] In order to investigate the fishery resources of the Pearl River's "four famous and precious river delicacies" - perch, rollmouth, spotted squid and big-eyed mandarin fish in the Qianjiang section of Guiping, the historical data obtained by the laboratory's investigation in the middle and lower reaches of the Pearl River were first used , and sorted out the body length-weight relationship equations of the four fish species in the Pearl River, as shown in Table 1, where the body length unit is centimeter (cm) and the body weight unit is gram (g). And the original data basically covered the body length distribution range of the four fishes in the research waters, and the correlation coefficient of the regression equation R 2 All above 0.8, the regression is valid.

[0020] Table 1. The body length-weight relationship equation of the...

Embodiment 2

[0031] Example 2 Guangdong bream fishery catch resources survey

[0032] Cantonese bream is one of the most important economic fishes in the middle and lower reaches of the Pearl River. It is widely distributed in the Zhaoqing-Fengkai section. According to the historical data obtained from the survey, the body length-weight relationship equation of Cantonese bream is as follows: W=0.0156L 3.0846 (R2=0.9744), where the unit of body length is centimeter (cm), and the unit of body weight is gram (g).

[0033] 2) According to the body length-weight relationship equation, according to the interval of 5cm, the body weight indicators of different body length specifications of Cantonese bream were estimated, and included in Table 4;

[0034] Table 4. The body weight of different specifications of Guangdong bream in the Pearl River

[0035] Body length cm 5 10 15 20 25 30 35 40 weight g 2 19 66 161 320 562 904 1364

[0036] 3) In March, June and Se...

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