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

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Abstract

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.

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Acknowledgments

We sincerely thank the ROV Hyper-Dolphin operation team and the captain and crew of the R/V Natsushima for their excellent effort and support during the intensive activities to deploy and retrieve the Una-Cam systems. We also especially thank the IRAGO Institute for providing the artificially matured Japanese eels for this study, and the R/V Kaiyo Maru for providing their oceanographic data during the survey. In addition, we greatly appreciate the support of the JAMSTEC cruise administration team who helped make this cruise possible.

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Author notes

  1. Taketoshi Kodama

    Present address: Japan Sea National Research Institute, Fisheries Research Agency, Niigata, Niigata, 951-8121, Japan

Authors and Affiliations

  1. Marine Technology and Engineering Center, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, 237-0061, Japan

    Tatsuhiro Fukuba & Tetsuya Miwa

  2. College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, 252-8510, Japan

    Shun Watanabe, Michael J. Miller & Katsumi Tsukamoto

  3. Faculty of Agriculture, Kyushu University, Hakozaki, Fukuoka, 812-8581, Japan

    Noritaka Mochioka

  4. IRAGO Institute Co. Ltd., Tahara, Aichi, 441-3605, Japan

    Yoshiaki Yamada

  5. Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan

    Michael J. Miller

  6. National Research Institute of Fisheries Science, Fisheries Research Agency, Yokohama, Kanagawa, 236-8648, Japan

    Makoto Okazaki, Taketoshi Kodama & Seinen Chow

  7. National Research Institute of Aquaculture, Fisheries Research Agency, Yokosuka, Kanagawa, 238-0316, Japan

    Hiroaki Kurogi

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  1. Tatsuhiro Fukuba
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  2. Tetsuya Miwa
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  11. Katsumi Tsukamoto
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Correspondence to Tatsuhiro Fukuba.

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Fukuba, T., Miwa, T., Watanabe, S. et al. A new drifting underwater camera system for observing spawning Japanese eels in the epipelagic zone along the West Mariana Ridge. Fish Sci 81, 235–246 (2015). https://doi.org/10.1007/s12562-014-0837-4

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  • DOI: https://doi.org/10.1007/s12562-014-0837-4

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