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Salinity tolerance and early survival of F1 hatchlings crossbred between amphidromous and landlocked strains of ayu under experimental condition

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Abstract

The ayu, Plecoglossus altivelis, with an amphidromous life migrating between the sea and streams, is a commercially important fish for the inland fisheries of Japan. Despite intensive transplantation, seedlings originating from non-native population landlocked in the Biwa Lake have been less contributable to stock recovery. In fact, no apparent evidence of introgression from the released fish to the native population has been obtained. We hypothesized that the parental property from the landlocked strain would give some disadvantages to the offspring against saline osmotic pressure during their early life in the sea. The acute performance of newly hatched larvae in 180% artificial seawater at 26°C was evaluated by the parental combinations of amphidromous and landlocked strains. As a result, hatchlings from amphidromous parents lived longer than those from landlocked parents, whereas outbred hatchlings showed no difference in their survival period between landlocked and amphidromous paternities. Hatchlings from amphidromous parents lived longer than outbred half-sibs with landlocked paternity, while hatchlings from landlocked parents lived shorter than outbred half-sibs with amphidromous paternity. Reduced salinity tolerance in the landlocked population was proved to be paternally inherited, which can explain the disappearance of hybridized lineage through the failure in the early survival. When supplementing for the purpose of stock enhancement, it is important to consider matching exotic conspecifics with native populations.

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Data availability

The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

We are grateful to Taeko Hazama, Mariko Yokoyama and Yukari Katagiri for their help with the experiments. This study was in part supported by grants from the Japan Ministry of Agriculture, Forestry and Fisheries and by KAKENHI (Grants-in-Aid for Scientific Research, 18H02267) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyomachi 1-14, Nagasaki, 852-8521, Japan

    Kei’ichiro Iguchi

  2. Department of Marine Bioscience, Research Center of Marine Bioresources, Fukui Prefectural University, Katsumi 49-8-2, Obama, Fukui, 917-0166, Japan

    Hirohiko Takeshima

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  1. Kei’ichiro Iguchi
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  2. Hirohiko Takeshima
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Correspondence to Kei’ichiro Iguchi.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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All applicable international, national and/or institutional guidelines for the care and use of animals were followed. The experimental procedure and housing conditions used in this study were in accordance with the ethical guideline of the Ichthyological Society of Japan.

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Iguchi, K., Takeshima, H. Salinity tolerance and early survival of F1 hatchlings crossbred between amphidromous and landlocked strains of ayu under experimental condition. Ichthyol Res 70, 467–473 (2023). https://doi.org/10.1007/s10228-023-00905-5

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  • DOI: https://doi.org/10.1007/s10228-023-00905-5

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