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Open AccessFeature PaperArticle

Automatic Bluefin Tuna Sizing with a Combined Acoustic and Optical Sensor

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Institute of Control Systems and Industrial Computing (AI2), Universitat Politècnica de València (UPV), 46022 València, Spain
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Institut d’Investigació per a la Gestió Integrada de Zones Costaneres (IGIC), Universitat Politècnica de València (UPV), 46022 València, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(18), 5294; https://doi.org/10.3390/s20185294
Received: 16 July 2020 / Revised: 5 September 2020 / Accepted: 11 September 2020 / Published: 16 September 2020
(This article belongs to the Special Issue Marine Imaging and Recognition)
A proposal is described for an underwater sensor combining an acoustic device with an optical one to automatically size juvenile bluefin tuna from a ventral perspective. Acoustic and optical information is acquired when the tuna are swimming freely and the fish cross our combined sensor’s field of view. Image processing techniques are used to identify and classify fish traces in acoustic data (echogram), while the video frames are processed by fitting a deformable model of the fishes’ ventral silhouette. Finally, the fish are sized combining the processed acoustic and optical data, once the correspondence between the two kinds of data is verified. The proposed system is able to automatically give accurate measurements of the tuna’s Snout-Fork Length (SFL) and width. In comparison with our previously validated automatic sizing procedure with stereoscopic vision, this proposal improves the samples per hour of computing time by 7.2 times in a tank with 77 juveniles of Atlantic bluefin tuna (Thunnus thynnus), without compromising the accuracy of the measurements. This work validates the procedure for combining acoustic and optical data for fish sizing and is the first step towards an embedded sensor, whose electronics and processing capabilities should be optimized to be autonomous in terms of the power supply and to enable real-time processing. View Full-Text
Keywords: underwater acoustics; underwater computer vision; fishery management; fish sizing; biomass estimation; automatic 3D measurements underwater acoustics; underwater computer vision; fishery management; fish sizing; biomass estimation; automatic 3D measurements
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Muñoz-Benavent, P.; Puig-Pons, V.; Andreu-García, G.; Espinosa, V.; Atienza-Vanacloig, V.; Pérez-Arjona, I. Automatic Bluefin Tuna Sizing with a Combined Acoustic and Optical Sensor. Sensors 2020, 20, 5294.

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