Inshore migration mechanisms based on comparison of early life history among five species of Anguilla

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450281
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Tokyo Medical University
• Principal Investigator: Shinoda Akira 東京医科大学, 医学部, 講師 (70401297)
• Co-Investigator(Kenkyū-buntansha): AOYAMA Jun 東京大学, 大気海洋研究所, 教授 (30343099) ; YOSHINAGA Tatsuki 北里大学, 海洋生命科学部, 准教授 (30406912) ; AMIYA Noriko 北里大学, 海洋生命科学部, 講師 (20588503)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ニホンウナギ / 熱帯ウナギ / ルソン島 / 初期生活史 / 接岸回遊 / 耳石

Outline of Final Research Achievements

The anguillid glass eels were collected during two years in estuary of the Cagayan River in northern Luzon Island, the Philippines. Three anguillid species, Anguilla luzonensis, A. bicolor pacifica and A. marmorata were dominant, and A. japonica was rarely occurred. A. celebesensis that was reported in previous studies not occurred in study period. The spawning areas of A. japonica and A. marmorata were overlapping in the North Equatorial Current (NEC), their ages at recruitment were almost same (about 150 days). By contrast, A. bicolor pacifica was recruited about 170 days, which is longer than A. japonica and A. marmorata. A. luzonensis shows intermediate ages at recruitment between A. marmorata and A. bicolor pacifica, suggesting that spawning areas of A. luzonensis locates in NEC.

Free Research Field

魚類生態学