Method for researching spawning ground positions of river drifting egg spawning fish

Abstract

The invention provides a method for researching spawning ground positions of river drifting egg spawning fish. The method comprises the following steps of framing spawning riverway ranges; establishing one-dimensional water age simulation models, wherein an unsteady flow process simulation module carries out verification through utilization of actually measured data; laying out fish egg monitoringsections; recording fish egg sampling points, and carrying out gene sequencing to obtain development time when fish eggs are sampled; replaying unsteady flow processes in spawning periods through utilization of the one-dimensional water age simulation models; substituting the sampling points of the fish and the development time when the fish eggs are sampled into the model, obtaining the development time when the fish eggs are sampled through water age space distribution and the gene sequencing, and reversely researching a spawning position of each fish egg; and carrying out statistic analysis on spawning position data of a great number of fish eggs, thereby obtaining main egg spawning grounds of the fish. According to the method provided by the invention, through utilization of the one-dimensional water age simulation models and a gene detection technology, the spawning ground positions of the river drifting egg spawning fish can be researched relatively precisely, so basis for fishhabitat research and protection can be provided.

Description

technical field [0001] The invention relates to a method for calculating the position of a spawning ground, in particular to a method for calculating the position of a spawning ground for fish that lay floating eggs in rivers. Background technique [0002] Due to the development and operation of a large number of hydropower projects, the hydrological and hydrodynamic conditions of the river have been changed, thereby affecting the distribution and living environment of fish habitats. Fish spawning grounds are important and sensitive places in fish habitats. They are waters where fish mate, spawn, decompose and raise young, and are related to the reproduction of fish populations. Therefore, accurately calculating the location of fish spawning grounds is the focus of fish conservation ecology research, and it is also the focus of current wading engineering impacts. [0003] For fish that lay drifting eggs, there are mainly two methods to determine the location of the spawning...

AI Technical Summary

Problems solved by technology

[0006] From the point of view of the determination method, the empirical method is relatively accurate, but not comprehensive enough; the average flow rate law has certain contingency and uncertainty, for example, the change of the flow rate in the river section, the identification accuracy of the fish egg development time, and the fish egg development time caused by the change of water temperature. Factors such as changes in the speed of embryonic development, the number and distribution of fish egg sampling points will affect the judgment of the location of the spawning ground

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