Detect the cause of reduction and conserve the endangered endemic piscivorous fish, Opsariichthys uncirostris.

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K00630
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental and ecological symbiosis
• Research Institution: Hokkaido University of Education
• Principal Investigator: IMAMURA AKIO 北海道教育大学, 教育学部, 准教授 (00390708)
• Co-Investigator(Kenkyū-buntansha): 山中 裕樹 龍谷大学, 理工学部, 講師 (60455227) ; 丸山 敦 龍谷大学, 理工学部, 准教授 (70368033)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 繁殖遡上 / 環境DNA / 安定同位体解析

Outline of Final Research Achievements

Three lips inhabited only in suitable shoreside of Lake Biwa (Imamura 2018). Not just competition between invasive species is the cause of the Three-lips's reduction. We reported the deterioration of the reproductive conditions, which are the tributries of Lake Biwa. We could not detect the cause of their establishment to Kyusyu Island.
We could develope species-specific primers for the three lips and we studied their reproduction in detail. They migrated along the river for about 5 km maximamly and their reproduction was detected in July.

Free Research Field

保全生態学

Academic Significance and Societal Importance of the Research Achievements

琵琶湖淀川水系の固有種であり、上位捕食者であるハスについて、その繁殖状況について詳細を示すことができた。その過程において、種特異的なDNA検出系を確立することが出来た。繁殖に着目することで、琵琶湖への流入河川の環境変化が大きな影響を及ぼしているという科学的な示唆を得ることができた。