First capture of post-spawning female of the Japanese eel Anguilla japonica at the southern West Mariana Ridge

Hiroaki Kurogi, Makoto Okazaki, Noritaka Mochioka, Tadao Jinbo, Hiroshi Hashimoto, Masanori Takahashi, Atsushi Tawa, Jun Aoyama, Akira Shinoda, Katsumi Tsukamoto, Hideki Tanaka, Koichiro Gen, Yukinori Kazeto, Seinen Chow

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Two adult male freshwater eels, Anguillajaponica, were captured in June 2008 in the West Mariana Ridge (13°N, 142°E) in the North Pacific, but collections of females have yet to be reported. In September 2008, we successfully caught two adult female A. japonica, 55.5 and 66.2 cm in total length, in the adjacent but northern area (14°N, 143°E). Six newly hatched eel larvae (pre-leptocephali) were also collected by subsequent plankton sampling conducted near the female catch area. Female adults appeared to be in the post-spawning state, probably a considerable time after spawning, since a small number of remarkably regressed oocytes (50-250 μm in diameter) were observed in the ovaries. Capture of post-spawning female eels and newly hatched larvae near the Suruga Seamount (14°N) together with the previous collection of mature males in the southern area (13°N) corroborates that the area along the West Mariana Ridge is the spawning area of this species, but suggests that the eel spawning may occur over a wider area than previously expected.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalFisheries science
Volume77
Issue number2
DOIs
Publication statusPublished - Mar 1 2011

All Science Journal Classification (ASJC) codes

  • Aquatic Science

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