A new drifting underwater camera system for observing spawning Japanese eels in the epipelagic zone along the West Mariana Ridge

Tatsuhiro Fukuba, Tetsuya Miwa, Shun Watanabe, Noritaka Mochioka, Yoshiaki Yamada, Michael J. Miller, Makoto Okazaki, Taketoshi Kodama, Hiroaki Kurogi, Seinen Chow, Katsumi Tsukamoto

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Spawning-condition Japanese eels Anguilla japonica, fertilized eggs, and newly-hatched preleptocephali have been captured, and studies for observing spawning eels with underwater camera systems have begun. This study describes a new, less invasive, free-drifting underwater camera observation system that was deployed from the research vessel (R/V) Natsushima in June 2013. Three drifting buoy camera systems (Una-Cam) with lights-on/lights-off programmed sequencing during daytime and nighttime hours were deployed over a period of seven days at 20 locations south of a salinity front along the southern West Mariana Ridge. Live artificially matured A. japonica eels held in transparent chambers were used as an attractant source through the release of reproductive pheromones and other odors. Each system was suspended from a buoy array at a depth of 174–200 m, with four cameras and three lights pointed downward at different angles towards the eel chamber. The Una-Cam systems were stable and were effective at recording images of fish, crustaceans, and gelatinous zooplankton. Olfactory cues may have attracted male and female Derichthys serpentinus eels, which showed what seemed to be reproductive behavior and attraction to the Japanese eels in the chamber. Una-Cam systems are capable of recording images of anguillid eels, if they approach, and may be useful for observing spawning eels in their offshore spawning areas.

元の言語英語
ページ(範囲)235-246
ページ数12
ジャーナルFisheries science
81
発行部数2
DOI
出版物ステータス出版済み - 1 1 2015

All Science Journal Classification (ASJC) codes

  • Aquatic Science

フィンガープリント A new drifting underwater camera system for observing spawning Japanese eels in the epipelagic zone along the West Mariana Ridge' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

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    Fukuba, T., Miwa, T., Watanabe, S., Mochioka, N., Yamada, Y., Miller, M. J., Okazaki, M., Kodama, T., Kurogi, H., Chow, S., & Tsukamoto, K. (2015). A new drifting underwater camera system for observing spawning Japanese eels in the epipelagic zone along the West Mariana Ridge. Fisheries science, 81(2), 235-246. https://doi.org/10.1007/s12562-014-0837-4