Estimation of Bluefin Tuna (Thunnus thynnus) mean length in sea cages by acoustical means

[EN] This paper proposes an indirect method to estimate Bluefin Tuna (Thunnus thynnus) biomass in cages using acoustic techniques. Two Simrad EK60 echosounders working at 120 and 200 kHz and a stereo camera were used to obtain target strength (TS) to fork length (FL) relationships for both operating...

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Detalles Bibliográficos
Autores: Puig Pons, Vicente|||0000-0002-8154-8259, Muñoz-Benavent, Pau|||0000-0003-4681-183X, Pérez Arjona, Isabel|||0000-0001-9010-6287, Andreu García, Gabriela|||0000-0001-5448-6171, Valiente González, José Miguel|||0000-0003-4055-8976, Atienza-Vanacloig, Vicente|||0000-0001-9017-8707, Pastor Gimeno, José Ismael|||0000-0002-7184-4871, Espinosa Roselló, Víctor|||0000-0001-8882-866X, Ladino-Velásquez, Anderson, Llorens-Escrich, Susana, Ordoñez-Cebrian, Patricia
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/193581
Acceso en línea:https://riunet.upv.es/handle/10251/193581
Access Level:acceso abierto
Palabra clave:Underwater acoustics
Bluefin Tuna Biomass estimation
Underwater computer vision
Target strength
Fish management
Fish sizing
MATEMATICA APLICADA
ARQUITECTURA Y TECNOLOGIA DE COMPUTADORES
FISICA APLICADA
Descripción
Sumario:[EN] This paper proposes an indirect method to estimate Bluefin Tuna (Thunnus thynnus) biomass in cages using acoustic techniques. Two Simrad EK60 echosounders working at 120 and 200 kHz and a stereo camera were used to obtain target strength (TS) to fork length (FL) relationships for both operating frequencies. The equipment was placed at the bottom of a floating cage, facing towards the surface to record the ventral aspect of fish. The acoustic and optical recordings were automatically analysed and the combination of acoustic and optical results provided unequivocal TS-FL assignments. Good relationships between TS and FL were obtained for both frequencies even without discriminating data from different fish tilts and without using beam directivity compensation. Stronger correlations were obtained for compensated TS at 200 kHz when reduced tuna swimming tilt was considered. TS measurements were compared to MFS numerical predictions for a Bluefin swimbladder model, with the simulation results showing good agreement with experimental measurements. The results allow the mean tuna length to be predicted in growing or fattening cages from acoustic data raising the possibility of improving production management and of providing a useful tool for catch control estimations made by international organisations (like ICCAT) and government bodies. (c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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