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Method for quickly determining various ecdysis periods of river crabs

A river crab, fast technology, applied in the crab breeding technology, quickly distinguishing the field of different molting periods of river crabs, can solve the problems of high cost, poor accuracy of manual discrimination method, etc., achieve the effect of small workload, repeatability, and increase growth rate

Active Publication Date: 2015-12-16
FRESHWATER FISHERIES RES INSITUTE OF JIANGSUPROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the laboratory method adopted in the existing river crab molting period division needs patented equipment, the cost is high, and the accuracy of the manual discrimination method is poor, and a simple device can be used to realize the rapid determination of the molting period so as to provide A method for quickly distinguishing different molting periods of river crabs based on feeding decisions

Method used

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with embodiment.

[0029] A method for quickly distinguishing different molting periods of river crabs. The principle is based on the tightness of the inner epidermis of the carapace and the exoskeleton at different molting periods, thus presenting different color differences, and using a colorimeter to read the color values ​​​​at different molting periods , so as to distinguish and divide the moulting cycle stage of the individual. According to the color difference of the carapace in different molting periods of river crabs, the present invention establishes the color value ranges of river crabs in different molting periods, uses a colorimeter to read the color data of individuals in different molting periods, compares the color values, and determines and divides the molting cycle stages of individuals. It is convenient, quick, easy to operate, and has high accuracy, which is of great significance to...

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PUM

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Abstract

A method for quickly determining various ecdysis periods of river crabs is characterized by comprising the following steps of first opening a colorimeter to automatically conduct black-white board correction via a white board, after the correction, conducting standard measurement, adjusting a reading mode into a Lab mode, in which L indicates color lightness,+ means inclination to white, - means inclination to darkness, a indicates color green-red value, + means inclination to red and - means inclination to green indicating blue-yellow value, + means inclination to yellow and - means inclination to blue, taking out of a crab individual, wiping off a crab head, chest and back parts, reading blue-yellow value (b) of crab head-chest exoskeleton via the colorimeter, and making the following determinations according to the blue-yellow value (b): when b is no less than 7, the individual is in a proecdysis; when b is no more than 2, the individual is in ecdysis; and when b is more than 2 and less than 7, the individual is during the ecdysis. The method is simple and convenient to operate; no detection damages are caused to the crabs; and foundations are provided for crab breeding and management level.

Description

technical field [0001] The invention relates to an aquaculture technology, in particular to a river crab culture technology, in particular to a method for quickly distinguishing different molting periods of river crabs. Background technique [0002] The life history of river crabs is composed of multiple molting cycles. Each molting cycle includes pre-molting (D), molting (E), post-molting (A / B), and intermolting (C). In the early stage of molting (D), the regulation of hormone secretion in the body is active, the level of molting hormone in the blood increases, and the inner epidermis and exoskeleton begin to gradually separate. Molt stage (E) The exoskeleton breaks down and the crab body molts out of the old shell. In the later stage of molting (A / B stage), the crab body absorbs a large amount of water, and the body length and weight increase rapidly. The intermolting period (C) is when body length and weight no longer increase, nutrients begin to accumulate, and tissue...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 李旭光周刚谷孝鸿周军林海黄鸿斌曾庆飞毛志刚
Owner FRESHWATER FISHERIES RES INSITUTE OF JIANGSUPROVINCE
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