Tassie Acoustic Society (TACOS) seminar

9 November 2017

We have another two great talks lined up for our next TACOS seminar scheduled for the 29th November in CSIRO’s Auditorium (next to the main reception) from 15:30-17:00.

The first talk will be given by Sven Gastauer from UTAS.

Ping it back - Towards the acoustic assessment of the Northern Demersal Scalefish Fishery

Sven Gastauer

"Fisheries acoustics are one of the most promising tools for holistic marine monitoring. Modern fishing vessels, equipped with echosounders, can be used as scientific platforms. While fisheries acoustic surveys are now a standard monitoring technique for many commercially important pelagic species in high latitudes, application in small scale fisheries remains sparse. Here we focus on the use of acoustic data collected aboard a small trap fishing vessel operating within the Northern Demersal Scalefish Fishery off Broome (Western Australia). Acoustic data and optical catch recordings were collected opportunistically. Acoustic scattering properties of key species were estimated and it was shown that abundance, biomass, habitat, hotspot and acoustic diversity indices can be extracted from such data. Precision estimates were established using geostatistics."

The second talk will be given by Haris Kunnath from CSIRO.

Deep-water calibration of echosounders used for biomass surveys and species identification

Haris Kunnath, Rudy J. Kloser, Tim E. Ryan, and Jacques Malan

"With the advancing applications of deep-water echosounders involving moored, towed, profiling and autonomous instruments, calibration of echosounders at the operating depth is needed to ensure unbiased estimates of biomass and species identification. In this context, we used the Deepwater Calibration Acoustic Facility (DeCAF) to examine the depth-dependent in situ variations in two important calibration parameters: the on-axis gain and equivalent two-way beam angle of three widely used split-beam transducers (Simard ES38-DD, ES120-7CD, and MSI-38). The analyses carried out using the sphere calibration method reveal significant variations in calibration parameters that in combination could result in substantial systemic biases in quantitative biomass estimation and species identification."

 

There will be 30 minutes available at the end for a general discussion if needed, otherwise the session will end and all are invited to Barcelona for a drink and general catch up.

We have kindly offered to sponsor a few drinks so don’t miss out!

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