[ASC-media] Eavesdropping on fish to measure river health

Toss Gascoigne director at tossgascoigne.com.au
Wed Mar 14 20:28:07 PDT 2018


Eavesdropping on fish to measure river health

Analysing sound is a powerful tool for exploring ecosystems - from jungles to oceans. But researchers are using new sound technology to analyse the sounds of river inhabitants for the first time in order to understand how healthy waterways are.

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Often hidden from sight, and definitely not heard by humans, fish grunt, squeal and gurgle as they hunt, make love and pass the time of day with neighbours.

For the first time, we are able to use these sounds in order to detect the health of fresh waterways, the rivers, lakes and streams.
 
In research published in Frontiers in Ecology and the Environment researchers used underwater microphones to record the sounds of fish, other animals and the water itself. Analysing this soundtrack allowed scientists to count the number and variety of fish and animals present, and measure river health.

Dr Simon Linke from the Australian Rivers Institute at Griffith University says the advantage of the new approach is that it provides a continuous measurement that does not hurt fish.

“Traditional methods of monitoring freshwater systems rely on taking samples, and these are expensive, unreliable and intrusive. They are only accurate at the time they are taken, in contrast to an audio monitoring system which gives a continuous readout,” he says. 

New technology has been developed that uses AI to analyse these continuous river recordings.

Dr Toby Gifford - now at Monash University - is an expert in real-time processing of audio signals. He argues that we can now use computers to automatically process biological sounds, removing the need to manually annotate and count fish calls.

“Acoustic monitoring is becoming mainstream in many terrestrial ecosystems, and even in oceans,” he said. “It is exciting to start applying these methods in rivers, particularly now that advances in deep learning are making automated analysis feasible.”

The recording system used by Dr Linke and his colleagues also works with insects, as Dr Camille Desjonqueres from the Paris Natural History Museum explains:

“We record the sounds of water insects, another important indicator of water quality. When these soundtracks are fed into a computer, our acoustic monitoring system provides an instant readout.”

The next logical step would be to build a database of fish calls, so the sounds can be matched with a fish species.

“There are 120,000 bird calls on record and it would be great to have a similar underwater sound database, like a museum reference collection,” Dr Linke says.

The research was carried out Dr Linke and colleagues from Australia, Switzerland and France has. The researchers hope their paper will be a call to action for the global research community to gather forces and make this operational in the next 10 years.

 

People available for interview:

·    Dr Simon Linke – Ecologist, project co-lead – s.linke at griffith.edu.au - 0410 022 221

·    Dr Toby Gifford – Acoustician, project co-lead - toby.gifford at monash.edu - 0421 278 043

 

Assets available at

http://www.biospheresoundscapes.org/freshwaterecoacoustics.html

·    Videos

·    Fish and field photos

·    Audio from river recordings

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