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Fisheries Science

, Volume 85, Issue 5, pp 801–809 | Cite as

Evaluation of optimum temperature for the early larval growth of Japanese eel in captivity

  • Mari KurokiEmail author
  • Akihiro Okamura
  • Yoshiaki Yamada
  • Shunsuke Hayasaka
  • Katsumi Tsukamoto
Original Article Aquaculture

Abstract

Early larval growth of the Japanese eel Anguilla japonica reared at five different water temperatures (19, 21, 23, 25, and 27 °C) is described for the first month post-hatching, a critical period of time in the culture of these sensitive larvae. After 3 weeks of culture, larvae reared at 27 °C attained the greatest total length and body height of all temperature treatments. Larvae reared at higher temperatures developed rapidly due to active feeding, despite higher metabolic costs. At lower temperatures of 19–21 °C, sudden mortality 12–16 days post-hatching coincides with the transition of larvae from endogenous to exogenous feeding. A linear relationship between water temperature and otolith diameter for cultured eel larvae otoliths suggests that the mean ambient water temperature experienced by wild larvae during their first month after hatching is about 23 °C. This temperature corresponds to mean water temperatures likely experienced by larvae during diel vertical migrations in the North Equatorial Current. We propose rearing early stage Japanese eel larvae at variable temperatures throughout the light/dark cycle to enhance their survival and growth in captivity.

Keywords

Freshwater eel Growth Leptocephalus Mortality Otolith Seedling production Temperature 

Notes

Acknowledgements

We are grateful to the members of the IRAGO Institute for their kind support during experimentation. This work was supported in part by KAKEN grants (nos. 26252030, 17H03859) from the Japan Society for the Promotion of Science and the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Copyright information

© Japanese Society of Fisheries Science 2019
corrected publication 2019

Authors and Affiliations

  • Mari Kuroki
    • 1
    Email author
  • Akihiro Okamura
    • 2
  • Yoshiaki Yamada
    • 2
  • Shunsuke Hayasaka
    • 1
  • Katsumi Tsukamoto
    • 1
    • 2
  1. 1.Department of Aquatic Bioscience, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
  2. 2.IRAGO Institute Co., Ltd.TaharaJapan

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