Abstract
Litopenaeus vannamei, as the main target of shrimp farming in China, has a great market prospect and high economic value. However, domestic Litopenaeus vannamei farming and feeding efficiency are low, mainly through the use of hand tools by farmers to complete the feed throwing work, and the feed cost is high. Therefore, in view of the high density and low visibility of culture ponds in Litopenaeus vannamei aquaculture industry, it is impossible to judge the quantity and time of feed feeding by visual way. In this study, based on the analysis of acoustic feeding signal characteristics of Litopenaeus vannamei, accurate and intelligent control of feed amount is proposed, so as to reduce the breeding cost and obtain environmental benefits. This study designed a system for collecting and analyzing the acoustic signals of the feeding motion of Litopenaeus vannamei. Based on passive acoustic technology, the motion acoustic signal of Litopenaeus vannamei is extracted when starving. Through time domain and frequency domain research, the characteristic parameters of the motion acoustic signal of the specific body type of Litopenaeus vannamei are determined. The signal duration range is 8-10ms, and the average range of the resonance band is 2-10KHz. Furthermore, the dual-threshold method is further used to detect the effective range of the feeding signals, and then the number of acoustic signals is obtained, and the corresponding magnitude relationship between the characteristic parameters and the starvation degree of Litopenaeus vannamei is established, which can be used as a basis for judging intelligent feeding on demand. The research provides theoretical support for the feasibility of studying the feeding patterns of Litopenaeus vannamei through underwater passive acoustic detection.
Highlights
Passive acoustic technology uses the radiated noise of underwater targets in different environments to detect, locate, track and identify targets [1]
This study has found through many experiments that the acoustic signals emitted by Litopenaeus vannamei when feeding are mainly produced by the behavior of the shrimps swimming and grabbing food when they are hungry
The study mainly used time domain and frequency domain analysis to discuss the main acoustic parameters produced during the feeding process of adult Litopenaeus vannamei in the experimental water tank
Summary
Passive acoustic technology uses the radiated noise of underwater targets in different environments to detect, locate, track and identify targets [1]. This study has found through many experiments that the acoustic signals emitted by Litopenaeus vannamei when feeding are mainly produced by the behavior of the shrimps swimming and grabbing food when they are hungry. The study mainly used time domain and frequency domain analysis to discuss the main acoustic parameters produced during the feeding process of adult Litopenaeus vannamei in the experimental water tank. VOLUME 8, 2020 and frequency domain, the characteristics of the collected eating sound signals are analyzed to indicate that the feeding activities of shrimp are related to their behavior of swimming and grabbing food when they are hungry. The signal collection in this experiment was performed with the oxygen generator turned off, and there was no interference from other acoustic signals
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