Cephalopod population and variety identification method

Abstract

The invention discloses a cephalopod population and variety identification method. The method comprises the steps of (1) firstly, extracting hard tissues (such as cutin jaws and the like) of cephalopods; (2) extracting main shape features of the hard tissues by using landmark points; (3) calculating an average form and a centroid size by software; (4) carrying out dimension reduction processing onthe obtained data, carrying out principal component analysis, and obtaining the first N groups of principal components with the proportion of more than 80%; and (5) taking the first N groups of selected principal components as explanatory variables, and carrying out discriminant analysis. Compared with a traditional method, the method has the advantages that the form of the hard tissues can be simulated, the difference can be seen more visually, meanwhile, the species or population discrimination accuracy can be effectively improved, the method can be expanded and applied to individual difference analysis, and a reference basis is provided for fishery resource evaluation and habitat evaluation in different periods.

Description

technical field [0001] The invention relates to the technical field of fishery management, in particular to a method for identifying cephalopod populations and species. Background technique [0002] Cephalopods belong to molluscs, all of which are marine animals, widely distributed in all major seas of the world, including squid, cuttlefish, and octopus. At present, there are about 700 kinds of cephalopods in the world, and there are many kinds. Cephalopods are typically short-lived species, usually annuals. Since the 1970s, changes in world marine capture production have been caused by overexploitation and decline of many bottom fish stocks, but cephalopods and other fish with short life cycles have changed the composition of catches, So that the growth of the total catch is maintained at a certain level. The average annual growth rate exceeds the annual growth rate of total marine capture production. With the dramatic changes in the marine environment in recent years, ...

AI Technical Summary

Problems solved by technology

However, due to large human errors, traditional measurement methods often result in unsatisfactory divisions and cannot bring better results to resource assessment.

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