40年にわたるウナギの科学研究の歴史と最新の発展を示すコンピレーション。編者の塚本勝巳のチームは世界で初めて、野生のウナギの稚魚と受精卵を採集することに成功。New in softcover. Hardcover was published in 2023. This book is a compilation of eel research and fish migration studies for more than 40 years showing the research history and recent advances in eel studies. Dr. Katsumi Tsukamoto, the esteemed editor of this book, has been actively involved in eel research as one of the leading scientists in the world for a long time, and he and his team successfully collected the fertilized eggs and spawn-condition adult eels from the wild for the first time in the world.