2013 Fiscal Year Final Research Report
A mathematical model for induced behaviour in response to the environmental stimulation in Pacific bluefin tuna Thunnus orientalis
| Project/Area Number |
23580269
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Kinki University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KADOTA Minoru 近畿大学, 農学部, 研究員 (00596231)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 行動生理 / クロマグロ / 養殖 / 行動モデル |
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| Research Abstract |
In order to make quantitative statements regarding behavior patterns in animals, it is important to establish whether new observations are statistically consistent with the animal's equilibrium behavior. From the perspective of information theory such a bias can be interpreted as the amount of information gained from a new measurement, relative to an existing equilibrium distribution.
We demonstrate the utility of the relative entropy by analyzing observed speed distributions of Pacific bluefin tuna. We show that the tuna's behavior is modified by traumatic stress, and that the resulting modification is dominated by the difference in central tendencies of the two distributions.
We find that the tuna's behavior is significantly altered for ca. 5 hours after release. Our analysis reveals a periodic fluctuation in speed corresponding to the moment just before sunrise on each day, a phenomenon related to the tuna's daily diving pattern that occurs in response to changes in ambient light
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