| Project/Area Number |
12375005
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
General fisheries
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| Research Institution | TOKAI UNIVERSITY |
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Principal Investigator |
TANAKA Sho TOKAI UNIVERSITY, Tokai University, School of Marine Science and Technology, Professor (90138636)
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| Co-Investigator(Kenkyū-buntansha) |
TANIUCHI Toru Nihon University, College of Bioresource Science, 生物資源科学部, Professor (00012021)
WATABE Shugo University of Tokyo, Graduate School of Agricultural and Life Science, Professor (40111489)
OTAKE Tsuguo Mie University, Faculty of Biological Resources, Professor (20160525)
MURAKAMI Masahiro University of Tokyo, Graduate School of Agricultural and Life Science, Associate Professor (70134517)
HYODO Susumu University of Tokyo, Ocean Research Institute, 助教授 (40222244)
小川 和夫 東京大学, 大学院・農学生命科学研究科, 助教授 (20092174)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥23,360,000 (Direct Cost: ¥19,700,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2002: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2001: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
Fiscal Year 2000: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | Freshwater elasmobranches / Bull shark / Sawfish / Madagascar / Zambezi River / Adaptabitity / Systematics / Conseration / 出現 / 平衡砂 / 水質調査 / アミメオトメエイ / ブジ川 / ベツボカ川 / 浸透圧 / 分布 / セントルシア湖 / マハジャンボ川 / リンポポ川 |
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| Research Abstract |
Bull shark and sawfish are known to inhabit tropical big rivers and lakes in the world, especially famous in Zambezi River. However, it is a clear why they go up to the freshwater area. The purpose of the research throws light on systematics, adaptability and conservationo freshwater elasmobranches in southeast Africa. We could not collect Bull shark and sawfish from Zambezi River, Limpopo River and Lakes Lucia where bull shark occurred about 35years ago. In coastal town of South Africa and Mozambique, snout of sawfish longer than 1 meter on display, but fisherman does not catch any sawfish recently. We could get information that sharks and sawfish in Zambezi River are very ra On the other hand, bull shark and sawfish were collected from Betsiboka River, Madagascar. Although occurrence of these elasmobrancke from Madagascar was reported briefly by Kiener (1963), their specimens were not kept in museum We carried bull shark and sawfish from Madagascar to Japan and kept them in scientific museum. We contribute occurrence and description of these specimens to intemation scientific journal. A piece of materials from these elasmobranches uses as analyses. The ratio of Sr to Ca in bull shark is higher than that sawfish. This shows that bull shark go into freshwater area quite recently. As a result on the analysis of extractive nitrogenous compourd from freshwater elasmobranches, sawfish kept plenty of taurine, urea, hypotaurine-like substance, sarcocin, (β-Alanin, glycinbetaine an TMAO in their muscle, and plenty of taurine and urea in their liver. This suggested these substances function as a osmolite.
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