Acoustic tag tracking method for parent crabs of Yangtze estuary eriocheir sinensis

Abstract

Provided is an acoustic tag tracking method for parent crabs of Yangtze estuary eriocheir sinensis. The method is characterized by comprising the steps that acoustic tags are fixed to back shells of the parent crabs; evaluation tests are carried out on the signed crabs, and if the signed crabs are not obviously different from a control crab, it indicates that the signed crabs can be used for release study; areas coinciding with the migration site of the natural population parent crabs in the same day are selected as the release water area of the signed crabs, longitude and latitude data of a release site are recorded through a GPS instrument, and release time is recorded; after a headphone finds acoustic signals in the signal monitoring stage, a directional monitoring headphone is put at the position two meters deep in water, and a monitor records the signal strength and time of all the acoustic signs; the received signal strength is converted into the position of the signed crabs according to the regression equation of the signal strength of the acoustic signs and the distance, and the GPS data of the signed crabs are recorded; the migration speed of each signed crab is calculated according to a migration speed formula and the GPS data, and the moving positions of the parent crabs are connected to obtain a migration route; when the signed crabs reach a spawning ground, the signed crabs stay still and carry legs for reproduction, and the water area is the spawning ground of the parent crabs.

Description

technical field [0001] The invention belongs to fishery resource monitoring technology, in particular to an acoustic mark tracking method for Chinese mitten crab parent crabs. Background technique [0002] Chinese mitten crab, also known as river crab and hairy crab. In recent years, with the changes in the habitat of aquatic organisms in the Yangtze River, the increase of hydraulic construction and the increase of fishing intensity, the quantity and distribution of Chinese mitten crab resources have also undergone tremendous changes. Chinese mitten crabs are widely distributed in the middle and lower reaches of the Yangtze River. There are mature Chinese mitten crab parent crabs (abbreviated parent crabs) from the Yangtze River estuary area to Shashi, Hubei and other river sections. Every year, when young crabs are fattened in rivers, rivers, lakes, reservoirs and other inland freshwater waters, their gonads gradually mature, and they begin to move in groups to the estuary...

AI Technical Summary

Problems solved by technology

During the migration of parent crabs in the Yangtze River, it is of great significance to accurately grasp the migration rules of parent crabs for both production fishing and scientific research. Therefore, it is urgent to invent a quantitative measurement method for measuring the migration speed, migration route and spawning ground range of the parent crabs in the Yangtze River Estuary, so as to accurately grasp the characteristic values ​​of the parent crab migration rules, so as to provide support for the fishing and habitat protection of the parent crabs in the Yangtze River Estuary. , multiplication and release, ecological restoration, etc. provide a theoretical basis

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