CN-122019956-A - Method for estimating effective accumulated temperature of spawning and breeding of floating egg fishes

CN122019956ACN 122019956 ACN122019956 ACN 122019956ACN-122019956-A

Abstract

The application discloses a method for estimating effective accumulated temperature of spawning and propagation of a drift-producing egg fish, which comprises the steps of obtaining daily average water temperature data of spawning sites of drift-producing egg fish, determining time for each year of the drift-producing egg fish to start spawning in the spawning sites, determining minimum value of daily average water temperature of all years, determining minimum value of daily average water temperature of each year and occurrence date thereof, determining minimum critical water temperature required by spawning and propagation of the drift-producing egg fish, determining possible distribution range of biological zero degree, respectively calculating effective accumulated temperature required by spawning and propagation under different assumption biological zero degree of different years, respectively calculating variation coefficients of the effective accumulated temperature under different assumption biological zero degree conditions on all evaluation years, determining real biological zero degree of the target fish according to the variation coefficients, and determining minimum effective accumulated temperature required by spawning and propagation of the target fish according to the biological zero degree. The application estimates the effective accumulated temperature required by spawning and breeding of the drift-producing oofish.

Inventors

CHEN ZHONGXIAN
SHI YULONG
TANG YUCHUAN
Feng Shenghang
ZHU JUN
PAN ZENG
CHEN XIAOJUAN
YANG ZHI
ZHU QIGUANG
LIANG ZHIMING
ZHANG YONG
ZHOU TAO

Assignees

中国长江三峡集团有限公司
中国长江电力股份有限公司
水利部中国科学院水工程生态研究所

Dates

Publication Date: 20260512
Application Date: 20260211
Priority Date: 20251205

Claims (7)

1. A method for estimating effective egg laying and breeding heat accumulation of floating egg fish, the method comprising: acquiring daily average water temperature data of a spawning site of the driftage egg-producing target fish; Determining the time for the floating egg-producing target fish to begin spawning in the spawning ground each year; determining the minimum value of the average water temperature day by day of all years; Determining the minimum value of the daily average water temperature of each year and the occurrence date of the minimum value; Determining the minimum critical water temperature required by spawning and breeding of the floating egg target fish; Determining a possible distribution range of biological zero degrees; respectively calculating effective accumulated temperatures required by spawning propagation under different years and different hypothesis biology at zero degrees; calculating the variation coefficients of the effective accumulation temperature under the condition of biological zero degrees under different assumptions on all evaluation years respectively; determining the real biological zero degree of the target fish according to the variation coefficient; and determining the minimum effective accumulated temperature required by spawning and breeding of the target fish according to the real biological zero degree of the target fish.
2. The method for estimating the effective temperature of spawning propagation of a drifting oofish according to claim 1, wherein obtaining daily average water temperature data of a spawning site of the drifting oofish comprises determining a main spawning site location of the estimation target fish and obtaining daily average water temperature data of a river section in or near the main spawning site.
3. The method for estimating the effective accumulated temperature of spawning and propagating in a drift-producing oofish according to claim 1, wherein the possible distribution range of biological zero degrees is determined based on the minimum value of the average daily water temperature for all years and the minimum critical water temperature required for spawning and propagating in the target fish.
4. The method for estimating an effective heat accumulation for spawning and propagating in a drift-producing egg fish according to claim 1, wherein calculating the effective heat accumulation required for spawning and propagating under biological zero degrees on different hypotheses for different years, respectively, comprises: According to the minimum value of the daily average water temperature of each year, the occurrence date of the minimum value, the possible distribution range of biological zero degree and the time for starting spawning of target fishes in spawning sites each year, the effective accumulated temperatures required by spawning propagation under different assumption biological zero degree of different years are respectively calculated.
5. The method for estimating the effective heat accumulation for spawning reproduction of a drifting oofish according to claim 1, wherein determining the true biological zero degree of the target fish based on the coefficient of variation comprises: By comparing the variation coefficients under the different biological zero-degree conditions, the biological zero-degree with the minimum variation coefficient is considered as the real biological zero-degree of the target fish according to the long-term adaptability principle of the fish to the ecological environment.
6. The method for estimating the effective heat accumulation for spawning and propagating of the drifted egg fish according to claim 1, wherein the minimum effective heat accumulation required for spawning and propagating of the target fish is determined according to the determined real biological zero degree of the target fish by corresponding analysis.
7. The method for estimating the effective laying and breeding temperature of the drift-producing egg fish according to claim 1, characterized in that: According to 3,4 and 5, determining biological zero degree of initial gonad development of the floating egg fish, and determining minimum effective accumulated temperature required by spawning and breeding of the floating egg fish according to 6.

Description

Method for estimating effective accumulated temperature of spawning and breeding of floating egg fishes Technical Field The invention relates to the field of ecology, in particular to a method for estimating effective accumulated temperature of spawning and propagation of drifting egg fishes. Background The water temperature is a necessary and limiting condition for spawning by the drifting egg-producing fish, and the spawning of the fish occurs within the range of water temperatures in which the fish is suitable for spawning. The water temperature plays an important role in influencing the development of fish gonads, the expression of steroid hormone, inhibiting ovulation, advancing or delaying spawning time, changing embryo survival rate and the like. For the drifted egg fish, achieving the key spawning water temperature during spawning and meeting the effective spawning temperature condition before spawning are key factors for realizing spawning activities. The effective temperature (EFFECTIVE ACCUMULATED TEMPERATURE) of fish reproduction refers to the sum of the cumulative temperatures of fish during reproduction where the ambient water temperature is above zero (i.e., the minimum effective temperature threshold required for development or reproduction) in degrees celsius. The acquisition of effective accumulated temperature data has important significance in predicting spawning peak time of fishes, evaluating suitability of propagation environment, implementing artificial propagation regulation, developing climate change research and the like. In the process of acquiring effective accumulated temperature data, the key is to clearly determine the biological zero degree required by spawning and breeding of different fishes. This is usually achieved by performing a strict indoor temperature control test, which has problems that 1) the test object is difficult to obtain (such as national protection of animals and the fish which is not broken through by the special fully artificial propagation technology at the upstream of the Yangtze river is difficult to introduce into the test room), 2) the test temperature condition is difficult to accurately control, and the water temperature process line is difficult to accurately match with the natural water temperature process line, so that the test design difficulty is increased, 3) the indoor test condition is limited, the stress or inadaptation behavior of the fish is increased, and the accurate obtaining of the final result may be affected. Therefore, there is an urgent need to form a method for statistically determining zero degrees and effective accumulation temperatures of floating egg fish biology based on field measured data. Disclosure of Invention In view of the above, the application provides a method for estimating the effective accumulated temperature of spawning and propagation of the drifting egg fishes, which can provide support for predicting spawning peak time of the fishes, estimating suitability of propagation environment, implementing artificial propagation regulation, developing climate change research and the like. According to one aspect of the present application there is provided a method of estimating effective deposition temperature for spawning reproduction in a drift-producing oofish, the method comprising: acquiring daily average water temperature data of a spawning site of the driftage egg-producing target fish; Determining the time for the floating egg-producing target fish to begin spawning in the spawning ground each year; determining the minimum value of the average water temperature day by day of all years; Determining the minimum value of the daily average water temperature of each year and the occurrence date of the minimum value; Determining the minimum critical water temperature required by spawning and breeding of the floating egg target fish; Determining a possible distribution range of biological zero degree according to the minimum value of the daily average water temperature of all years and the minimum critical water temperature required by the spawning and propagation of target fishes; According to the minimum value of the daily average water temperature of each year, the occurrence date, the possible distribution range of biological zero degree and the time of starting spawning of target fishes in spawning sites each year, calculating the effective accumulated temperature required by spawning propagation under different assumption biological zero degree (possible biological zero degree) of different years; calculating the variation coefficients of the effective accumulation temperature under the condition of biological zero degrees under different assumptions on all evaluation years respectively; determining the real biological zero degree of the target fish according to the variation coefficient; And determining the minimum effective accumulated temperature required by spawning and breeding of the target fish accord