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Effects of rearing temperature manipulation on oocyte maturation progress in Japanese eel

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  • Aquaculture
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A Correction to this article was published on 13 August 2021

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Abstract

During the induction of Japanese eel maturation, administering maturation-inducing steroids (MIS) or their precursors at an inappropriate maturational status is a major cause of poor egg quality. In this study, we investigated the feasibility of controlling oocyte maturation progress by rearing in cold and warm water to manipulate the timing of MIS administration. Mature females with oocytes at the migratory nucleus stage were reared for two terms (3 days to 1 day and 1 day to 0 days before MIS administration) at 20/20 °C, 20/15 °C, 15/20 °C, or 15/15 °C, and the maturational status was monitored based on their lipid droplet morphology and oocyte diameter. Oocytes matured faster at 20 °C than at 15 °C in either term. Next, the mature females were reared at 15 or 20 °C depending on the maturational status of each female 3 days and 1 day before MIS administration; the immature females were reared at 20 °C to accelerate their maturation. Consequently, the maturational status of most females was similar at MIS administration. After improvement, this method would lead most females to the optimum maturational status at MIS administration by properly rearing in cold and warm water.

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Acknowledgements

We are grateful to the staff of the Shizuoka Prefectural Research Institute of Fishery and Ocean for technical assistance. We also thank Drs. Sayumi Sawaguchi, and Natsuki Hasegawa at the Japan Fisheries Research and Education Agency for helpful discussion. This study was supported by a grant-in-aid (Development of seed production of the eel) from the Ministry of Agriculture, Forestry and Fisheries, Government of Japan.

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Authors and Affiliations

  1. Hamanako Branch, Shizuoka Prefectural Research Institute of Fishery and Ocean, Hamamatsu, Shizuoka, 431-0214, Japan

    Toshiomi Tanaka

  2. Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan

    Toshiomi Tanaka & Shinji Adachi

  3. Nansei Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Minami-ise, Mie, 516-0193, Japan

    Kazuharu Nomura

  4. Aquaculture Research Institute, Kindai University, Uragami, Wakayama, 649-5145, Japan

    Hideki Tanaka

  5. Kushiro Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Katsurakoi, Kushiro, Hokkaido, 085-0802, Japan

    Tatsuya Unuma

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  1. Toshiomi Tanaka
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  2. Shinji Adachi
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  3. Kazuharu Nomura
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  4. Hideki Tanaka
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Correspondence to Tatsuya Unuma.

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The original version of this article was revised: In this article the black down arrows in Fig. 2a. that should indicate white letters ‘20°C’ inside the arrows have disappeared. It has now appeared correctly in this article.

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Tanaka, T., Adachi, S., Nomura, K. et al. Effects of rearing temperature manipulation on oocyte maturation progress in Japanese eel. Fish Sci 87, 681–691 (2021). https://doi.org/10.1007/s12562-021-01531-8

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