Experimental Analysis of Underwater Noise in Large-scale Intelligent Aquaculture Platforms

CHEN Xiahua, CHEN Yiwen, QU Ke, XIONG Yiwen, LING Wenchang, DONG Yangze

Abstract

Aiming to alleviate the pressure of nearshore aquaculture on local ecosystems, there has been increasing attentions on offshore aquaculture based on large intelligent fish farm structure. Underwater noise generated by these structures is a critical basis for the assessment of their impact on the environment and the development of intelligent aquaculture. An experimental investigation was conducted on the 60000m3 intelligent aquaculture fish cage “HENGYI 1”. Hydrophones were strategically deployed at various depths on the key locations of the cage to record underwater noise, while sound level meters were simultaneously installed to monitor airborne noise. The results indicated that the diesel generator was the predominant noise source, generating significant underwater noise within the 20~1500Hz frequency band and increasing the total sound pressure level by approximately 10dB. Furthermore, the spectral characteristics of the underwater noise varied with both spatial position and depth across the cage. When feeding operations were halted and the diesel generator was inactive, the underwater noise levels of the platform nearly matched the background noise, with negligible differences across various depths. There was no evidence to support that the noise of the fish cage influenced obviously to the fish, but the behavior changes of the fish may exist. An initial analysis and evaluation to the fish for the underwater noise of the typical rectangular trussed fish cage were performed. The research result can provide a reference for future systematic experimental research and the deployment of intelligent acoustic aquaculture equipment.

 

Keywords: off shore aquaculture, large-scale aquaculture platforms, underwater noise, noise measurement methods

 

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