Reduced stress and increased immune responses in Nile tilapia kept under self-feeding conditions.
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- ENDO MAKOTO
- Laboratory of Fisheries Sciences, Faculty of Agriculture, Miyazaki University
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- KUMAHARA CHIKAKO
- Laboratory of Fisheries Sciences, Faculty of Agriculture, Miyazaki University
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- YOSHIDA TERUTOYO
- Laboratory of Fisheries Sciences, Faculty of Agriculture, Miyazaki University
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- TABATA MITSUO
- Department of Biosciences, Teikyo University of Science & Technology
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Abstract
Stress and immune responses were studied in Nile tilapia Oreochromis niloticus under both conditions of self-feeding and scheduled feeding. Self-feeding fish had a significantly lower cortisol level in their blood plasma than that of scheduled feeding fish. Furthermore, skin color was found to be paler in the self-feeding fish compared with that of the scheduled feeding fish. Thus, the self-feeding fish had a less stressful physiological status than the other experimental fish. Immunological analyses revealed that the self-feeding fish significantly exceeded the scheduled feeding fish in the phagocytic activity of their macrophages, antibody production, and the number of blood-circulating lymphocytes. The higher immune responses of self-feeding fish seem to be attained through a less stressful environment. This self-feeding behavior could be exploited to create reduced stress for disease control in fish farming.
Journal
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- Fisheries science
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Fisheries science 68 (2), 253-257, 2002
The Japanese Society of Fisheries Science
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Details 詳細情報について
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- CRID
- 1390001204428101120
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- NII Article ID
- 130003742432
- 10008272864
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- NII Book ID
- AA10993718
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- ISSN
- 14442906
- 09199268
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- NDL BIB ID
- 6151744
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed