2013 Fiscal Year Final Research Report
Measuring the swimming behaviour of a cultivated pacific bluefin tuna in a submarged aquaculture net cage
| Project/Area Number |
23780200
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
General fisheries
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| Research Institution | Kagoshima University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Keywords | クロマグロ / バイオロギング / 養殖 / ３次元遊泳行動 |
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| Research Abstract |
The purpose of this study was to clarify three-dimensional swimming behavior and monitor long-term swimming depth of cultivated bluefin tuna in a submerged cage using the bio-logging technique in order to realize offshore bluefin aquaculture in submerged net cages in Japan. Turning behavior during the day and night was analyzed from the results of three-dimensional trajectories of the tagged tuna. Turning of tuna during the day was sharper than that during the night. We recorded swimming depth using relative entropy to detect feeding and abnormal behaviors. Offshore Bluefin tuna aquaculture has a low yield ratio due to mortality of the colliding tuna in net cages. These results will help understand tuna behavior to improve net cages and prevent fish from colliding.
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