Quantitative determination method for migration speed and course of Yangtze River Chinese mitten crab parent crabs

• Main Authors: ZHANG LONGZHEN, ZHANG TAO, HUANG XIAORONG, WANG HAIHUA, ZHUANG PING, LIU JIANYI, FENG GUANGPENG, HOU JUNLI
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2013
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention relates to a quantitative determination method for migration speed and a course of Yangtze River Chinese mitten crab parent crabs. The number of sifted parent crabs is 5000-10000. The quantitative determination method for the migration speed and the course of the Yangtze River Chinese mitten crab parent crabs is characterized in that marks are coated on the parent crabs and lantern ring symbols are tied to the parent crabs. On the same day, the parent crabs are released in the river in the region which is overlapped with a migration locus of natural population parent crabs, and the longitude and the latitude of the release point and the time of release are recorded. Three monitoring sections of fixation gill nets are set in the lower course, 4-8 monitoring points are arranged on each monitoring section, the caught marked parent crabs by each monitoring point are checked each day, and the time and the quantity of catching are recorded. From the time that the first marked parent crab is caught, se