Comparative physio-chemical study on environmental tolerance of Corbicula japonica

• Project/Area Number: 09660229
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Fisheries chemistry
• Research Institution: Gakushuin Women's Junior College
• Principal Investigator: SHINAGAWA Akira Gakushuin Women's Junior College Associate professor, 助教授 (20215982)
• Project Period (FY): 1997 – 1998
• Project Status: Completed (Fiscal Year 1998)
• Budget Amount: ¥2,000,000 (Direct Cost: ¥2,000,000); Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: Brackish water clam / Salinity / Seasonal Variation / Biochemical composition / Glycogen / Extractive component / Free Amino acids / male and fenule / ヤエヤマヒルギシジミ / セタシジミ / 塩分耐性 / 嫌気耐性 / 有機酸 / 体液

Research Abstract

Comparative physio-chemical study on environmental tolerance of Corbicula japonica
Biochemical composition, Extractive components in the total tissues of brackish water clam Corbicula japonica were analyzed on the specimens collected monthly from January 1993 to November 1994 at Lake Shinji, Shimane Prefecture.
The seasonal variation throughout the year in the contents of moisture, protein, lipid is small, while that of glycogen is large. The content of glycogen was high from February to June.
The clam were rich in free amino acids, especially in alanine and glutamic acid. Most amino acids as well as extractive nitrogen did not show a marked seasonal variation. The increase in alanine, glutamic acid, glycine, proline, and beta-alanine under hyperosmotic condition were noticeable in the soft bodies studied, suggesting that these nitrogenous components play a significant role in intracellular osmoregulation.