1995 Fiscal Year Final Research Report Summary
OSMOREGULATORY MECHANISMS DURING EARLY LIFE STAGES IN FISH
| Project/Area Number |
06839010
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
海洋生物学
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| Research Institution | UNIVERSITY OF TOKYO |
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Principal Investigator |
KANEKO Toyoji UNIV.TOKYO,OCEAN RES.INST., ASSIST.PROF., 海洋研究所, 助手 (70221190)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Chloride cell / Yolk sac membrane / Osmoregulation / Chum salmon / Tilapia |
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| Research Abstract |
The present study was undertaken to clarify the osmoregulatory mechanisms during early life stages in fish and to investigate the possible involvement of chloride cells in the yolk-sac membrane in osmoregulation, using euryhaline tilapia (Oreochromis mossambicus) and chum salmon (Oncorhynchus keta). The followings are the results obtained for the last two years :
1.Eyed-stage embryos of chum salmon possess hypoosmoregulatory ability and chloride cells in the yolk-sac membrane may be involved in salt extrusion, in place of gill chloride cells, during the late embryonic stages.
2.Similarly, in tilapia embryos, chloride cells in the yolk-sac membrane are potentially important sites for ion exchange in seawater.
3.In tilapia, cortisol treatment stimulates the size and number of chloride cells in the yolk-sac membrane of embryos and larvae in vivo and in vitro, suggesting that cortisol present in the yolk may be involved in osmoregulation during early life stages.
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[Publications] Ono, M,.Harigai, T., Kaneko, T., Sato, U., Ihara, S., and Kawauchi, H: "Pit-1/GH factor-1 involvement in the gene expression of somatolactin" Mol.Endocrinol. 8. 109-115 (1994)
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「研究成果報告書概要(欧文)」より
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[Publications] Kakizawa, S., Kaneko, T.Hasegawa, S., and Hirano, T: "Effects of feeding, fasting, background adaptation, acute stress, and exhaustive exercise on the plasma somatolactin concentrations in raibow trout" Gen.Comp.Endocrinol. 98. 137-146 (1995)
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「研究成果報告書概要(欧文)」より
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