2023_programme: Numerical estimation of the target strength of Atlantic bluefin tuna using 3D computed tomographical images

• Session: 09. New frontiers in fisheries acoustics: applications- analysis- decision and management tools
  Organiser(s): Victor Espinosa
• Lecture: Numerical estimation of the target strength of Atlantic bluefin tuna using 3D computed tomographical images [invited]
  Paper ID: 2052
  Author(s): Pérez-Arjona Isabel Ladino Anderson, Puig-Pons Vicent, Espinosa Víctor
  Presenter: Pérez-Arjona Isabel
  Abstract: Swimbladder is the main contributor to acoustical target strength (TS) of fish when present. Numerical modelling of target strength must include swimbladder dimensions, orientation and shape for the proper estimation of target strength and its directivity. Several Atlantic bluefin tuna (ABFT) specimens between 90 and 100 cm of fork length have been studied by performing computed tomographic (CT) post-mortem in both fresh and frozen states including the use of contrast in some cases. ABFT's swimbladder 3D models have been derived to validate experimental TS measurements through numerical simulation methods, in this case using the Method of Fundamental Solutions (MFS). MFS allow calculating the backscattered acoustic field at any distance range between the target and the transducer, not only in the far-field regime, being relevant for short-range configurations or large targets, as it is the case. Good agreement between the numerical estimation and the experimental measurements in tanks is reported.
• Corresponding author: Dr Isabel Pérez-Arjona
  Affiliation: Universitat Politència de València
  Country: Spain
  e-mail: