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PelAcoustic II: collecting acoustic data from freezer-

trawlers

Sascha Fässler

Project aims

Continuation of data collection and “fisheries simulator” development

● Blue whiting

● Herring

Self-calibration by crew

● independent data collection

● increase data quantity

Calibration of acoustic equipment Calibration of acoustic equipment

Reference unit

Calibration

Calibration of acoustic equipment

113m

Project tasks

Build calibration sets for 5 trawlers

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scientific system: SIMRAD EK60 (includes a calibration program)

Project tasks

Develop calibration software

Echo from the reference sphere

Detected single target data points in the Calibration program

ER60 software

Custom made software for ES70

Project tasks

calibration courses / practicals

Project tasks

calibration courses / practicals Remote assistance during data collection & calibration

Project tasks

Assisted calibration in Scapa Flow

Scapa Flow

Cornelis Vrolijk (H171): 27.08.

Carolien (SCH81): 08.08.

Afrika (SCH24): 15.08.

Assisted calibration in Stornoway

Stornoway

Helen Mary (ROS785): 09.04.

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Remote calibration – via TeamViewer

Northern North Sea

Alida (SCH6): 12.07.

Remote assistance from ‘Tridens’ (during herring survey) via TeamViewer software

Data collection

Fishing seasons

Calibration

courses Self-calibrations / remote helpCalibration

practicals

Total project timeline

2013 2014 2015

Pro

ject

sta

rt

Calibration material &

software development

Example: 3 data collection trips during

North Sea herring fishery

Data collection...

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Data processingAcoustic raw data storage

Acoustic data

collection

Catch lists

Acoustic data processing

Calculate acoustic fish

density

Data output: fish detections

(T. Brunel, IMARES)

• example: North Sea herring fishery

Data output: fish detections

Data output: fish detections

June July August

Identified issues & way ahead

Calibration

● “Self-calibrations” not routine yet

● 1x per year assisted + regular check-ups?

Data recording & processing

● Data quantities are steadily increasing

● 1 week of data ~ 1 day of processing

● Automation procedures required

Analyses

● Take account of repeated coverages of the same stock and develop appropriate analysis methods for ‘preferential sampling’ design

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ways ahead: potential data use

Relative biomass index

Data analysis approaches

fish

ing

det

ecti

ons

time

Hotspot identification

Data analysis approaches

Mini-surveys

Data analysis approaches

Current global developments

SNP Peru

DFOCanada

SealordNew Zealand

CSIROAustralia

IMARES/PFANetherlands

Trials in SPRFMO area

Lima, 8-11 September 2014

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Antarctic krill VIa herring

SGHERWAY 2010

ICES WGFAST vessel calibration group &

2016 ICES ASC theme session

ICES ASC theme session

Thanks!