鳜摄食配合饲料的声学信号特征OA

Mandarin fish(Siniperca chuatsi)has become a major species in the catering consumer market in recent years,and its industrial demand has shown sustained growth.However,the current extensive feeding methods and low feed utilization rate have created severe challenges to its industrial development.To promote the innovation and upgrading of S.chuatsi breeding technology,industrial intelligence,and precise feeding,this study used passive acoustic monitoring(PAM)technology to study the acoustic characteristics of different size classes of Siniperca chuatsi during feeding on compound feed and their variations in the time-frequency domain.The acoustic signal characteristics of Siniperca chuatsi feeding behavior were thoroughly revealed by systematically analyzing the acoustic signals during their feeding.The average Mel-frequency cepstral coefficients can be used as an acoustic parameter to identify the feeding sound of Siniperca chuatsi.Swallowing sounds and chewing sounds were also classified.Using time-domain and frequency-domain analyses,different specifications of Siniperca chuatsi were used to explore and analyze its acoustic characteristics.The time-domain analysis revealed that the swallowing order of different specifications of Siniperca chuatsi was related to maximum amplitude,amplitude range,and feeding interval.Swallowing order was negatively correlated with maximum amplitude and amplitude range,and positively correlated with the feeding interval.It was found that with the increase of feeding order,the short-term average amplitude of swallowing sounds gradually decreased,showing a linear negative correlation.The regression equations'R2 of different specifications were all greater than 0.7,indicating that the linear fitting degree was good.The frequency domain showed that the main energy distribution range of swallowing sounds was 1.8～9 kHz,while that of chewing sounds was 1～6 kHz.The main energy distribution range was not affected by the size of the specifications,and the peak frequency of feeding sounds was slightly different according to the size of the specifications,but the difference was not large,so it can be used as the identification parameter of feeding sound characteristics in mandarin fish.Finally,the distribution of the peak energy of the feeding sound signal of Siniperca chuatsi was explored.The large probability distribution of the power value of the feeding sounds was 50～80 dB,and that of the chewing sounds was 20～40 dB.The power value of the peak frequency varied significantly with size class.