Method and system for determining suffocation death risk of fishes

Abstract

The invention discloses a method and system for determining the suffocation death risk of fishes. The method comprises the steps of obtaining fish data and water data in a closed environment; establishing an oxygen consumption rate prediction model and a non-fish oxygen balance model; utilizing the oxygen consumption rate prediction model and the non-fish oxygen balance model for establishing a dissolved oxygen concentration dynamic model; establishing a suffocation point prediction model; utilizing the dissolved oxygen concentration dynamic model for predicting a dynamic trajectory of the dissolved oxygen concentration in water to be predicted; utilizing the suffocation point prediction model for predicating suffocation points of the fishes in the water to be predicted; judging whether ornot predicted suffocation point values are smaller than or equal to the minimum dissolved oxygen concentration value in the dynamic trajectory of the dissolved oxygen concentration; if yes, determining that the fishes in the water to be predicted do not have the suffocation death risk; if not, determining that the fishes with weights corresponding to the predicted suffocation point values greaterthan the minimum dissolved oxygen concentration value have the suffocation death risk. By means of the method, the death risk of different fishes under the oxygen deficit condition of the water can be determined, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of water ecological risk analysis, in particular to a method and system for determining the suffocation death risk of fish. Background technique [0002] Regardless of natural water bodies or aquaculture, hypoxia will pose a threat to the survival of fish in them, and under severe conditions, a large number of fish will die. The concentration of dissolved oxygen (DO) in water is determined by the oxygen balance composed of oxygen supply (photosynthesis of water plants, atmospheric reoxygenation) and oxygen consumption (respiration of various organisms in water). When unfavorable environmental conditions appear, the oxygen supply is low enough to offset the oxygen consumption and the condition lasts for a certain period of time, the DO will continue to decline, and the life of the fish will be under hypoxic stress. In severe cases, the fish will die due to suffocation. Such unfavorable conditions include but...

AI Technical Summary

Problems solved by technology

[0004] There are many studies on the suffocation process of a specific fish at home and abroad, but natural water bodies often include the coexistence of multiple fishes, and there are often polyculture of multiple fishes in aquaculture water bodies. Only the suffocation research of a specific fish is used to conduct fish Prevention of suffocation death risk is difficult to be effective

At present, under the process of water body hypoxic conditions, there is still a lack of comprehensive model description for the determination of fish suffocation death risk. The main shortcomings are: lack of respiration rate models for different fish species under hypoxic conditions; Vulnerability model of fish species in the face of certain hypoxic stress (expressed as DO)

This has led to the current inability to analyze the mortality risk of different fish species under different degrees of suffocation death stress under water hypoxic conditions, especially in unstable and hypoxic water environments

The lack of such risk analysis tools means that in actual work, the risk of massive fish mortality cannot be effectively prevented, and the timing of intervention cannot be effectively identified, and the ecological disaster process or economic loss event caused by massive fish mortality cannot be effectively avoided.

Images