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Task 3:Harmonization and the optimisation of the acoustic methodology. Involved participants : IFREMER, HCMR, CNR-Ancona, CNR- Sicily , IEO. Introduction.

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task 3 harmonization and the optimisation of the acoustic methodology

Task 3:Harmonization and theoptimisation of theacousticmethodology

Involvedparticipants: IFREMER, HCMR, CNR-Ancona, CNR-Sicily, IEO.

introduction
Introduction
  • The acoustic target strength (TS) is an important metric in fisheries and plankton acoustics to inform on fish characteristics and to convert the acoustic energy in biomass units.
  • TS = 20 log L + b20
  • σbs = 10TS/10
subtask 3 1 target strength equations for anchovy and sardine
Subtask 3.1.- Target strengthequationsforanchovy and sardine

WP objectives:

  • To decide a commonprotocolforanalysis.
  • Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.
  • Toapplydifferent TS equations in pastacoustic data fromeacharea and comparisons of theresultingabundantestimateswillbemade.
  • Toestimate in situ TS equationsforeach target species (2002-2006).
1 to decide a common protocol for analysis
1.- To decide a commonprotocolforanalysis.
  • Toapplythesame TS (sardine & anchovy) toalltheMediterraneanacousticsurveys?
  • Toestimatesardine (Sardina pilchardus) and anchovy (Engraulisencrasicolus) TS “in situ” in everyarea (Adriatic, WMed; EMed…) and toapplyeachonetoitsrespectivearea…?
slide5
2.- Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.

-71.2 dB (Diner & Marchand, 1995; ICES 1997)

-72.6 dB (Degnboletal., 1985) (Herring,

Clupeaharengus)

slide6
2.- Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.

-71.2 dB (Diner & Marchand, 1995; ICES 1997)

-72.6 dB (Degnboletal., 1985) (Herring,

Clupeaharengus)

slide7
2.- Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.
slide8
2.- Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.
slide9
2.- Literaturereview of existing TS equations (Mediterranean and elsewhere) concerningsardine and anchovy.

Barangeet al., 1996; PIL (Sardinopsocellatus): -70.51; ANE (Engrauliscapensis/encrasicolus): -76.1 (South Africa)

slide10

3.- Toapplydifferent TS equations in pastacoustic data fromeacharea and comparisons of theresultingabundantestimateswillbemade.

EcoCádiz 2004: TS anchovy = -72.6, TS sardine = -72.6, TS S. colias = -68.7

EcoCádiz 2004R: TS anchovy = -71.2, TS sardine = -72.6, TS S. colias = -68.7

slide11

3.- Toapplydifferent TS equations in pastacoustic data fromeacharea and comparisons of theresultingabundantestimateswillbemade.

4 to estimate in situ ts equations for each target species 2002 2006
4.- Toestimate in situ TS equationsforeach target species (2002-2006).
  • Fishinghaulsselection:
    • Frequency: 38 kHz.
    • At nigth, dispersed.
    • Highpercentage of onespecies, 70, 80, 90%?
    • Otherspecies? Differentlengthdistribution.
    • Betternotbimodal.
    • Echosounder performance? (Soule et al, 1995; Jech et al,
    • In situ target strengthmeasurements. Preliminary data of sardine (Sardina pilchardusW.) fromtheMediterranean Sea. 1993. Carrera, P., J. Miquel & M. Iglesias. Workingpaper. ICES FAST WorkingGroup. Gothenburg, April 21-22.
fishing trawls with species percentage or to 871
Fishingtrawlswithspeciespercentage = or > to 87%

Green: raw data from EK60 (SIMRAD)