Hi Robin,

Did you ever get any responses to your query?  Just recovered a hydromoth I was testing for MPA monitoring, but all the files have no audio on them.  Was curious what others were doing underwater.

Jake

I am interested in this.

I intend to apply Hydromoths for location of Platypus Ornithorhynchus anatinus in local creeks. Visual surveys have produced signifcant results. 

Any success with otters in Europe may be helpful.

I would be looking at producing bioacoustic algorithm identifiers. 

Hi everyone, I just got my first hydromoth and wanted to test it for aquatic soundscape with interest in Tomistoma, Otter, boat traffic and maybe fishes too!  But before that I maybe test it on zoos.

What are your advices, tips, or suggestion for first-time user? thank you!

You won't get any audio if you don't allow enough time for the hydromoth/audiomoth to write. So when you do a continuous recording you need to experiment a little. I'm sure there is a formula to calculate this, but I haven't figure that out. I typically do 5 min recordings with 10 seconds of write/break time. I think this system is expecting you to subsample, so keep that in mind instead of a continuous recording. 

I do 8kHz sampling and get about 7 days of data and then the voltage gets too low and you start getting SD card write errors and missing files. 

In terms of analysis, I've had trouble understanding the directionality of the hydromoth and incorporating this into my studies. I always set up two at the same site to check the variability in my call detections and include this into my error analysis.