Experimental research is investigating the fundamental hearing capabilities of a number of fish species of conservation importance, including the European eel (Anguilla anguilla) and river lamprey (Lampetra fluviatilis). A physiological approach will allow the inferior limit of the audible detection range of a species to be quantified through the Auditory Brainstem Response (ABR) method. This will enable the generation of accurate audiograms, a graphical representation of the lowest frequencies detectable by a fish, at the lowest intensity. In addition, a behavioural approach will further quantify how fish respond to detectable sounds. Behaviour will be video recorded during exposure to sound (e.g. ranging from 100 to 1000 Hz with an intensity range from 90 to 140 dB), and will be post processed using novel video tracking software.

Results from this experimental research will help inform field based studies on acoustic deterrents and have direct application to the development of behavioural screening devices.

People:

Mathias Deleau

Prof. Paul Kemp

Prof. Paul White

Prof. Tim Leighton