Acoustics of Dolphins and Fish (Review)

Abstract

The review analyzes the research and development associated with dolphin and fish acoustics. The main focus is on the structure of echolocation and communication sounds of dolphins under conditions of intense noise impact. Sounds were recorded and emitted directly on the head of a dolphin at the hypothetical input points for acoustic information. The study also involved sounds within the nasal passage in order to more accurately localize emission sources. Fish sounds were recorded in the tank in which they were kept. The analysis showed that in order to raise their noise immunity, dolphins can intentionally change the structure of emitted sound signals when impacted by extremely intense noise. Hypotheses on the fish sound emission mechanism are proffered.