Establishment of data bank for habitat history of Japanese anchovy and the application to wild fish

2015 Fiscal Year Final Research Report

• Project/Area Number: 26660163
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Aquatic bioproduction science
• Research Institution: Japan Fisheries Research and Education Agency
• Principal Investigator: Yoneda Michio 国立研究開発法人水産総合研究センター, 瀬戸内海区水産研究所, 研究員 (30450787)
• Co-Investigator(Renkei-kenkyūsha): KATAYAMA Satoshi 東北大学, 大学院農学研究科, 教授 (30224455)
• Research Collaborator: KONO Naoki ; YAMAMOTO Masayuki ; HASEGAWA Jun ; OHTA Kengo ; TSUZAKI Tatsuo ; YAMADA Tetsuo ; TAKESHIMA Satoshi
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 分布・回遊 / 個体群構造 / 繁殖戦略

Outline of Final Research Achievements

This study examined the effect of carbon and nitrogen stable isotope ratios (SIRs) of feed on SIRs of muscle and ovary of Japanese anchovy under captive condition to identify the distribution and migration patterns of wild fish. In immature females, the change ratio of SIRs of muscle decelerated as individuals grew and developed. There were significant differences in change ratio of SIRs between muscles and ovaries of mature females. The SIRs of ovaries changed much faster than those of muscles, and then converged around the SIRs of feed provided within 20 days after the diet-switch. These findings suggest that the SIRs of muscles could reflect those of prey in the past areas while the SIRs of ovaries could reflect those of prey in the current (spawning) areas. Our preliminary observations of the SIRs of muscles and ovaries of wild females suggested that there may be several local populations around the waters of Seto Inland Sea.

Free Research Field

水産資源学