A team of French and American researchers used hydrophones to record the noises made by European spiny lobsters (Palinurus elephas). As it turned out, their relatives can hear such "signals" at a distance of almost three kilometers.
The object of the study was 24 large spiny lobsters off the coast of France, where a chain of hydrophones was placed in shallow waters. Scientists have found that lobsters emit a "rasp" sound by rubbing their antennae against the rasp-like area below the eyes. Sounds are used to communicate or to warn of approaching predators.
However, in terms of the range of sound propagation, they are far from being the record holders among marine life. The density of sea water (compared to air) facilitates the transmission of sounds over much greater distances. For example, sperm whales and dolphins give spiny lobsters a head start.
The ability to hear lobsters at great distances opens up the opportunity to control their location and regulate the population, the researchers said.