2025_programme: In situ measurements of Lateral target strength (TS) of Atlantic bluefin tuna (Thunnus thynnus) from purse seiners
- Day: June 16, Monday
Location / Time: C. THALIA at 18:00-18:20
- Last minutes changes: -
- Session: 10. New frontiers in fisheries acoustics: applications, analysis, decision and management tools
Organiser(s): Victor Espinosa
Chairperson(s): Victor Espinosa
- Lecture: In situ measurements of Lateral target strength (TS) of Atlantic bluefin tuna (Thunnus thynnus) from purse seiners
Paper ID: 2308
Author(s): Vicente Puig-Pons, Sergio Morell-Monzó, Hector Peña, Isabel Pérez-Arjona, Victor Espinosa
Presenter: Isabel Pérez-Arjona
Abstract: Atlantic bluefin tuna (Thunnus thynnus) is a species of high economic and environmental value. To ensure its sustainable management, the International Commission for the Conservation of Atlantic Tunas (ICCAT) has established fishing quotas and a limited fishing season from May to July. The purse-seine fleet has only 40 days to catch its allocated quota, making it essential for fishermen to use efficient tools for estimating school biomass. This study proposes the simultaneous use of a calibrated omnidirectional sonar (Furuno FSV-25) and a scientific echosounder (Furuno FCV-38) to enhance biomass estimation. The results present lateral target strength (TS) measurements obtained from the scientific echosounder during the 2024 fishing season. Acoustic data were compared with length estimates derived from a stereoscopic video system used during transfer operations. A bimodal length distribution was observed; however, this pattern did not appear in the TS distributions. A clustering algorithm was applied to establish a relationship between acoustic energy and fish size for two distinct fish groups.
Download the full paper
- Corresponding author: Dr Vicent Puig-Pons
Affiliation: Universtitat Politècnica de València
Country: Spain
