Method for evaluating fish population developing trend

A development trend and fish technology, applied in the field of evaluating the development trend of fish populations, can solve the problems of population development trend deviation, etc., and achieve the effect of cost reduction and accurate and reliable analysis results

Active Publication Date: 2013-09-25
PEARL RIVER FISHERY RES INST CHINESE ACAD OF FISHERY SCI
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Problems solved by technology

Therefore, only using fishermen's catches to infer the population size and p

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  • Method for evaluating fish population developing trend
  • Method for evaluating fish population developing trend
  • Method for evaluating fish population developing trend

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing, the specific steps of the present invention are described in detail by taking the population development trend of Cantonese bream as an example.

[0023] Cantonese bream is a 3-year-old sexually mature fish. Due to the small number of Cantonese bream over 5 years old in the natural aquatic ecosystem, the population of Cantonese bream is divided into 5 age classes, which are Ⅰ age, Ⅱ age, and Ⅲ age. Age, age IV, age V (including individuals who are 5 years and above).

[0024] 1. Calculation of the age class of fish in the breeding population and the proportion of each age class: based on the catch record data from 2006 to 2012, where the catch data includes the weight and body length of each Cantonese bream, etc. information. Via the Von Bertalanffy Growth Equation - Relation of Weight to Age W t =1602.762×(1-e -0.217(t+0.371) ) 2.8054 (where t is age, W t is the weight of Cantonese bream at age t) to calculate the ag...

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Abstract

The invention discloses a method for evaluating a fish population developing trend. Catch and fry data are used as a basis, age classes and the individual number of breeding group fish are analyzed, an age-class corresponding relation is built according to a sexual maturity stage of fish to be analyzed, the individual number of each age class of a breeding earlier stage of a corresponding year is calculated, and then the developing trend of a fish population is analyzed according to number ratio of each age class accounted in a whole fish population. Compared with a traditional trawling method, the cost of the method is greatly reduced. By combining the catch and the fry data, an analyzing result is accurate and reliable. The method is not limited by river geographical conditions, sampling time or other conditions and is a fish population age structure evaluation method capable of being applied widely.

Description

technical field [0001] The invention relates to a method for evaluating the development trend of fish populations. Background technique [0002] The development trend of fish population is divided into three types: growth type, stable type and decline type, which are determined by the age structure of the population. Accurate assessment of the development trend of each species in a fish community is the basis for the protection and utilization of fishery resources. Traditionally, trawling is used to assess fish populations, and the age structure of fish populations can be judged by identifying the scales of the catch and the third hard spine of the dorsal fin. However, for river ecosystems, due to factors such as the narrowness of some river channels, it is not practical to obtain population data through long-distance trawling. Therefore, it is generally used to indirectly obtain population data through fisherman's catch. However, under the premise of natural resource prot...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 帅方敏李新辉李跃飞谭细畅杨计平李捷
Owner PEARL RIVER FISHERY RES INST CHINESE ACAD OF FISHERY SCI
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