A kind of preparation method of material for age identification of great blue shark

Abstract

The invention discloses a preparation method of a material for identifying the age of a blue shark. Different materials are used by vertebrae of different sizes, a big vertebra material is prepared by virtue of a longitudinal slicing method, and a small vertebra material is prepared by virtue of a staining method. According to the preparation method, the problems that the vertebrae of the blue shark is difficult to grind and is easily damaged during the grinding, and the definition of annulations of slices is low are solved; the grinding of longitudinal slices of the blue shark comprises the processes of extraction, cleaning, slicing, fixing, polishing and the like; and the longitudinal sections of the vertebrae of the blue shark are polished with uniform force, and the polished slices of the vertebrae are sealed by virtue of a sealing agent, so that the annulations can be maintained for a long time.

Description

technical field [0001] The invention relates to a method for preparing a material for age identification of marine organisms, in particular to a method for preparing a material for age identification of a great blue shark. Background technique [0002] Blue shark is an important species of cartilaginous fishes, located at the top of the marine ecosystem, as the main bycatch species of longline fishery, its economic value is relatively high. The vertebra has the characteristics of stably storing growth information, and is the most effective material for studying the age and growth of sharks; the vertebra is double-concave, and the annual rings on the vertebra are characterized by a wide opaque layer (wide layer) and a narrow translucent layer (stenotic layer) Alternately arranged in concentric circles. The wide layer is formed in the spring and summer when the temperature rises rapidly, and the narrow layer is formed in the autumn and winter when the temperature drops and th...

AI Technical Summary

Problems solved by technology

[0003] The blue shark has the characteristics of slow growth, late sexual maturity, long reproductive cycle, and long lifespan. Once overfished, it will be difficult to restore the population resources. Therefore, it is necessary to assess the resources of the blue shark, and the age and growth information is Basic information for assessing the status of population resources; the spine of the blue shark grows with the growth of the fish body, but as the fish continues to grow, the spine will stagnate, but the growth information of the fish will continue to be stored in the spine In the later stages of shark growth, ring marks are prone to overlap, so it is very important to choose which age identification method

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