Otolith measurement and fish population discriminating method based on polar coordinate

Abstract

The invention relates to an otolith measurement and fish population discriminating method based on a polar coordinate, relates to the fish farming and management field and particularly relates to the method for distinguishing fish populations through measuring fish otolith. According to the method, a center point of an otolith picture is taken as a measurement reference point; end pointd, convex concave points or inflection points having prominent features in the otolith form are searched and taken as characteristic points; through establishing polar coordinates, the characteristic points and a core point are connected, radial length between the core point and each characteristic point is measured to acquire a set of characteristic length data; included angles of two adjacent connection lines are sequentially measured by utilizing the measurement software to acquire a set of characteristic angle data; on the basis of the characteristic length data and the characteristic angle data, a discrimination analysis method or a gray cluster analysis method is utilized, a population type of a detected sample is discriminated. Compared with a discriminating method through utilizing only the length, the otolith measurement and fish population discriminating method is advantaged in that the discrimination result is more accurate and reliable, and the fish population discrimination correct rate can be remarkably improved.

Description

technical field

[0001] The invention relates to fish cultivation and management, in particular to a method for distinguishing and distinguishing fish populations by measuring fish otoliths. Background technique

[0002] Fishery resources are an important part of natural resources and an important source of human food. It provides employment, economic benefits and social welfare for people engaged in fishing activities. In many countries, fish is an important part of daily life, providing 40% of the protein for two-thirds of the world's population, and nearly 1 billion people in Asia rely on fish and marine foods as their main source of animal protein. Therefore, the research on fishery resources, especially aquatic organisms such as fish, is very important.

[0003] Due to the special living environment and ways of aquatic organisms, understanding their growth, age and life history is of great help to us to better understand these species, and to use and develop them more r...

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