日本對鰻魚又有新發現...

對日本鰻產卵地的地海物化學 種鰻捕獲 受精卵撈得 算是滿完整的報告 下一步就是 目睹紀錄交配與產卵行為
可提供鰻魚人工繁殖條件與因子的改進參考

Nature Communications
Volume: 2, Article number: 179. DOI: doi:10.1038/ncomms1174
Accepted 22 December 2010 Published 01 February 2011

Oceanic spawning ecology of freshwater eels in the western North Pacific
Katsumi Tsukamoto,1 Seinen Chow,2 Tsuguo Otake,3 Hiroaki Kurogi,2 Noritaka Mochioka,4 Michael J. Miller,1 Jun Aoyama,1 Shingo Kimura,5 Shun Watanabe,1 Tatsuki Yoshinaga,6 Akira Shinoda,1, 7 Mari Kuroki,1, 8 Machiko Oya,1 Tomowo Watanabe,9 Kazuhiro Hata,10 Shigeho Ijiri,11 Yukinori Kazeto,12 Kazuharu Nomura13 & Hideki Tanaka13

Abstract
The natural reproductive ecology of freshwater eels remained a mystery even after some of their offshore spawning areas were discovered approximately 100 years ago. In this study, we investigate the spawning ecology of freshwater eels for the first time using collections of eggs, larvae and spawning-condition adults of two species in their shared spawning area in the Pacific. Ovaries of female Japanese eel and giant mottled eel adults were polycyclic, suggesting that freshwater eels can spawn more than once during a spawning season. The first collection of Japanese eel eggs near the West Mariana Ridge where adults and newly hatched larvae were also caught shows that spawning occurs during new moon periods throughout the spawning season. The depths where adults and newly hatched larvae were captured indicate that spawning occurs in shallower layers of 150–200 m and not at great depths. This type of spawning may reduce predation and facilitate reproductive success.

(http://www.nature.com/ncomms/journal/v2/n2/full/ncomms1174.html#/supplementary-information)

(放大請按圖)