基于超声多重散射理论的水产养殖池鱼群计数方法OA北大核心CSTPCD
Fish counting method in aquaculture ponds based on ultrasonic multiple scattering theory
对养殖池中生物数量进行实时准确评估是水产养殖作业的重要需求,利用超声波探测技术对生物数量进行计量是一种快速高效的手段.为解决超声波探测应用在深度低的养殖池中结果误差较大的问题,提出了一种基于变异系数的时域区间选取方法,采用发射频率 40 kHz的超声换能器,在体积为 0.115 m3 的圆筒中,进行了养殖池鱼类计数实验.结果显示,通过选取合适时域区间和增加测量次数可以有效提高计数结果的准确性.利用该方法分别在无增氧和有增氧 2 种情况下,对圆筒内 10～40 尾草金鱼数量进行估算,结果的平均绝对误差分别为 0.924 和 1.769 尾.研究表明,该基于超声多重散射理论的计数方法在增氧机持续开启时依然适用,并且增大样本数量后,能够进一步提高计数的精度.本研究为低深度、小面积的水产养殖池中鱼的数量评估提供了新路径.
Accurate assessment of the number of organisms in aquaculture ponds is an important requirement in aquaculture.Fish counting methods based on machine vision and near-infrared light can quickly and accurately estimate the biomass in the culture pond under better light environmental conditions,but it is affected by fish over-lap,water turbidity,light,bubbles,and other factors.Fish counting method based on sonar camera and echo sounder can effectively investigate the amount of biological resources in the ocean or lake,but it is limited by the area and water depth of the aquaculture pond in the industrial aquaculture.A time domain interval selection method based on coefficient of variation was proposed to solve the problem of error in the application of ultra-sonic detection in aquaculture ponds with low depth.The ultrasonic transducer with an emission frequency of 40 kHz was used to count the fish in aquaculture ponds in a cylinder with a volume of 0.115 m3.Aiming at the prob-lem of error in the estimation results of ordinary multiple scattering theory,a time-domain interval selection method based on coefficient of variation was proposed.The method was used to estimate the number of 10-40 fishes in the cylinder without and with aeration.The results showed that the MAE was 0.924 and 1.769 fish,RMSE was 1.148 and 2.054,and the CV between estimated and actual values were 0.995 and 0.983,respectively.The results showed that the error was highly correlated with the selection of the time domain interval,and the vari-ation coefficient and the three evaluation indexes kept consistent with the change trend of the time domain interval.By selecting the appropriate time domain interval and increasing the number of measurements,the accuracy of the counting results could be effectively improved.The research showed that the accuracy of aquatic organism count-ing could be effectively improved after increasing the number of samples although there were bubbles in the envir-onment after oxygenation,which leads to a decrease in the accuracy of estimation.The experiment proved that the method was still applicable in the scene with oxygenation demand.This study provides a new path for assessing fish density in low-depth and small-area aquaculture ponds by ultrasonic technology.
李志坚;李俊康;陈雷雷;李俊;胡庆松
上海海洋大学工程学院,上海 201306||上海海洋大学,上海深渊科学工程技术研究中心,上海 201306上海海洋大学工程学院,上海 201306
水产学
水产养殖渔业声学鱼群计数多重散射
aquaculturefisheries acousticsfish countingmultiple scattering
《水产学报》 2024 (012)
72-82 / 11
上海市水产动物良种创制与绿色养殖协同创新中心项目(2021 科技02-12) Shanghai Collaborative Innovation Center for Cultivating Elite Breeds and Green-culture of Aquaculture animals(2021-KJ-02-12)
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