Method for representing influence of water temperature change on fish spawning

Abstract

The invention provides a method for representing the influence of water temperature change on fish spawning. The method comprises the following steps: S1, selecting any one of temperature-sensitive cyprinid fishes as a target fish, and collecting multi-year spawning condition data of the target fish in a target river; S2, acquiring the lowest water temperature corresponding to the initial spawningdate of the target fish as the critical water temperature of spawning of the target fish; S3, acquiring the lowest water temperature of the target river in each survey year as the lower limit of thebiological zero water temperature of spawning of the target fish, and acquiring the average water temperature of the gonad development starting month of the target fish as the upper limit of the biological zero water temperature; and S4, acquiring the biological zero T0 and accumulated temperature threshold of gonad development starting of the target fish. According to the method, the accumulatedtemperature threshold in the gonad development process is used as a main index, so that the accuracy of a reservoir ecological scheduling scheme can be greatly improved, and the water temperature influence effect can be better evaluated.

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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