A method for characterizing the effects of water temperature changes on fish spawning

Abstract

A method for characterizing the impact of water temperature changes on fish spawning, comprising the following steps: S1, selecting any one of the temperature-sensitive carps as a target fish, and collecting data on the multi-year spawning of the target fish in a target river; S2. Obtain the minimum water temperature corresponding to the initial spawning day of the target fish as the critical water temperature of the target fish's spawning; S3. Obtain the minimum water temperature of the target river in each survey year as the biological zero water temperature lower limit of the target fish's spawning, and obtain the gonad of the target fish The average water temperature in the beginning of the month of development is used as the upper limit of the biological zero temperature water temperature; S4, obtaining the biological zero temperature T at which the gonads of the target fish begin to develop 0 and accumulated temperature threshold; the present invention takes the accumulated temperature threshold in the gonad development process as the main index, which can greatly improve the accuracy of the ecological regulation scheme of the reservoir and better evaluate the effect of water temperature.

Description

technical field [0001] The invention relates to the field of reservoir ecological regulation, in particular to a method for quantitatively studying the influence of water temperature on fish spawning. Background technique [0002] With the construction of high dams and large reservoirs all over the world, all major freshwater systems are facing the impact of dams' storage and blocking. The operation of high dams and large reservoirs in tropical and subtropical regions has caused reservoir water temperature stratification, resulting in a trend of warmer autumn and winter temperatures and lower spring and summer temperatures. As an advanced organism in the aquatic ecosystem, fish's body temperature is completely dependent on the influence of the surrounding water temperature. Therefore, understanding and mastering the impact of water temperature on fish is an important part of studying the impact of abnormal water temperature on the ecosystem caused by dam construction. [0...

AI Technical Summary

Problems solved by technology

For example, the delay of oocyte development process, the reduction of egg production, the reduction of effective reproductive rate and survival rate, etc. are not conducive to the sustainable development of fish.

[0004] At present, the impact of reservoir water temperature changes on fish reproduction is mostly concentrated on the impact of critical water temperature on the initial spawning time, without considering the specific heat demand of long-term water temperature accumulation on fish reproduction, so it is impossible to fully characterize the impact of water temperature changes on fish production. egg effect

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