Reduced stress and increased immune responses in Nile tilapia kept under self-feeding conditions.
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Accession number;02A0401760
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| Title;Reduced stress and increased immune responses in Nile tilapia kept under self-feeding conditions. |
| Author;
ENDO M
(Miyazaki Univ., Miyazaki, Jpn)
KUMAHARA C
(Miyazaki Univ., Miyazaki, Jpn)
YOSHIDA T
(Miyazaki Univ., Miyazaki, Jpn)
TABATA M
(Teikyo Univ. Sci. & Technol., Yamanashi, Jpn)
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Journal Title;Fish Sci
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Journal Code:L2029A
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ISSN:0919-9268
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VOL.68;NO.2;PAGE.253-257(2002)
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| Figure&Table&Reference;FIG.6, REF.27 |
| Pub. Country;Japan |
| Language;English |
| 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. (author abst.) |
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