Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage

Swimming trajectories of aquatic animals that are estimated using the dead-reckoning technique below the sea surface tend to have very large associated observational errors. Therefore, the aim of the present study was to develop a technique for removing accumulated errors from such trajectories for...

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Autores principales:	K Komeyama, M Kadota, S Torisawa, T Takagi
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2013
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/3ccb78f76c1b49bba2a3453e10f8f320
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spelling	oai:doaj.org-article:3ccb78f76c1b49bba2a3453e10f8f3202021-11-17T10:04:47ZThree-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage1869-215X1869-753410.3354/aei00075https://doaj.org/article/3ccb78f76c1b49bba2a3453e10f8f3202013-06-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v4/n1/p81-90/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Swimming trajectories of aquatic animals that are estimated using the dead-reckoning technique below the sea surface tend to have very large associated observational errors. Therefore, the aim of the present study was to develop a technique for removing accumulated errors from such trajectories for Pacific bluefin tuna Thunnus orientalis. Horizontal and vertical speeds and heading angle were measured in an aquaculture net cage using 2 types of data loggers, and current velocity was recorded at a depth of 12 m to measure the tidal current speed around the net cage. Fourier analysis indicated that the primary source of error in trajectory estimates was the effect of ocean currents, which resulted in drift, and further analysis revealed that the frequency contributing to drift was consistent with the low-frequency signal in a spectrum analysis of horizontal speed. Therefore, a high-pass filter was applied to horizontal speed data to remove any frequencies lower than the cut-off frequency (0.0015 Hz), following which these data were back-transformed into a time domain that no longer included the drift effect caused by the current. The reconstructed trajectories fit within the inner diameters of the net cage, indicating that they were realistic. To confirm the validity of the resultant swimming trajectories, a flume tank experiment was conducted, which demonstrated that the high-pass filter effectively removed current drift from the estimated trajectory. Furthermore, since the method was estimated to have a precision of approximately 0.20 m, it not only allows the 3-dimensional trajectories of circling tuna to be estimated but can also be applied to the behavior of fish in the wild.K KomeyamaM KadotaS TorisawaT TakagiInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 4, Iss 1, Pp 81-90 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 K Komeyama M Kadota S Torisawa T Takagi Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
description	Swimming trajectories of aquatic animals that are estimated using the dead-reckoning technique below the sea surface tend to have very large associated observational errors. Therefore, the aim of the present study was to develop a technique for removing accumulated errors from such trajectories for Pacific bluefin tuna Thunnus orientalis. Horizontal and vertical speeds and heading angle were measured in an aquaculture net cage using 2 types of data loggers, and current velocity was recorded at a depth of 12 m to measure the tidal current speed around the net cage. Fourier analysis indicated that the primary source of error in trajectory estimates was the effect of ocean currents, which resulted in drift, and further analysis revealed that the frequency contributing to drift was consistent with the low-frequency signal in a spectrum analysis of horizontal speed. Therefore, a high-pass filter was applied to horizontal speed data to remove any frequencies lower than the cut-off frequency (0.0015 Hz), following which these data were back-transformed into a time domain that no longer included the drift effect caused by the current. The reconstructed trajectories fit within the inner diameters of the net cage, indicating that they were realistic. To confirm the validity of the resultant swimming trajectories, a flume tank experiment was conducted, which demonstrated that the high-pass filter effectively removed current drift from the estimated trajectory. Furthermore, since the method was estimated to have a precision of approximately 0.20 m, it not only allows the 3-dimensional trajectories of circling tuna to be estimated but can also be applied to the behavior of fish in the wild.
format	article
author	K Komeyama M Kadota S Torisawa T Takagi
author_facet	K Komeyama M Kadota S Torisawa T Takagi
author_sort	K Komeyama
title	Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
title_short	Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
title_full	Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
title_fullStr	Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
title_full_unstemmed	Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage
title_sort	three-dimensional trajectories of cultivated pacific bluefin tuna thunnus orientalis in an aquaculture net cage
publisher	Inter-Research
publishDate	2013
url	https://doaj.org/article/3ccb78f76c1b49bba2a3453e10f8f320
work_keys_str_mv	AT kkomeyama threedimensionaltrajectoriesofcultivatedpacificbluefintunathunnusorientalisinanaquaculturenetcage AT mkadota threedimensionaltrajectoriesofcultivatedpacificbluefintunathunnusorientalisinanaquaculturenetcage AT storisawa threedimensionaltrajectoriesofcultivatedpacificbluefintunathunnusorientalisinanaquaculturenetcage AT ttakagi threedimensionaltrajectoriesofcultivatedpacificbluefintunathunnusorientalisinanaquaculturenetcage
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Three-dimensional trajectories of cultivated Pacific bluefin tuna Thunnus orientalis in an aquaculture net cage

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