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Independent Data on Acoustics with Fishing Vessels in Chile

This article explores the use of fishing vessels equipped with scientific echosounders for acoustic surveys in Chile. The data collected provides independent indices for stock assessment of jack mackerel. The surveys focus on abundance estimation using mini-grids and involve calculations to estimate density. The article also discusses the calibration procedures and highlights the significant amount of information gathered through the surveys.

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Independent Data on Acoustics with Fishing Vessels in Chile

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  1. INDEPENDENT DATA ACUSTICA CON EMBARCACIONES DE LA FLOTA EN JUREL ACOUSTICS WITH FISHING VESSELS IN CHILE Instituto de Investigación Pesquera Talcahuano inpesca@inpesca.clasepulveda@inpesca.cl INSTITUTO DE INVESTIGACIÓNPESQUERA CHILE

  2. Concept • In Chile, the use of Fishingvesselsstartsince 1996/1997 with EUREKA surveystakingobservationsonacousticechosounders Since 2000, INPESCA wasimplementingsurveysusingfishingvesselsworkingtogether (2 to 6 vessels) and observing mean density of schools in relation to oceanographicfeatures • Complexity in Lifehistory and distribution of jackmackerel • Provideindependentindicesfor stock assessment • Vessels were equipped with SIMRAD EK60s Scientific Echosounders (38KHz transducers) • Analysis with Echoview software • Calibration procedure before surveys and each year • More than 12 Tbites of information

  3. Fishing setsJack Mackerel 2003

  4. Fishing setsJack Mackerel2004

  5. Fishing setsJack Mackerel2005

  6. ACUSTICA CON EMBARCACIONES DE LA FLOTA

  7. Survey concepts

  8. Focus of abundance: Minigrids

  9. Focus of abundance: Minigrids

  10. Nociones del método acústico Cálculos para estimar la densidad  (Ton/mn2) Sigma depends on mean weight and length Sa = 100 Target strength Tabla 1. Rangos de TS del jurel.

  11. Identification setsJuly 2002

  12. AcousticsurveysfortheBiomassevaluation

  13. Biomasa julio 2002: 3,7 millones de toneladas

  14. Biomassaugust 2004: 7,3 milliontons

  15. Crucero 2005:

  16. Survey 2005:

  17. Acoustic estimates of Biomass

  18. Recent years

  19. Recent years

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