Abstract
In Lake Nojiri, the Japanese smelt, Hypomesus nipponensis McAllister, 1963, population has been thought to be maintained by artificial spawning, and stocking efforts as natural spawning in in-flowing streams is unlikely due to the lack of inflowing stream habitat. In this study, novel resident Japanese smelt spawning was observed along the lakeshore in shallow areas with clean gravel and flow. Spawning occurred at night during early March to mid-April and eggs, confirmed on gravel substrate, progressed to the eyed state in 5–6 weeks. Although natural spawning was observed, the ratio of eggs that progressed to the eyed stage was minimal, possibly due to thick algae cover in areas with low flow velocity. Therefore, resident Japanese smelt spawning along the lake shoreline is physically possible and potentially contributes to the overall population in Lake Nojiri, but in-lake spawning alone presumably is not a biologically viable method for population sustainability due to low survival rates and egg density at present. Environmental improvements such as construction of fish ladders to suitable in-flowing spawning habitat, introduction of clean gravel to shorelines, and water level management adjusted to the smelt spawning run would contribute to higher recruitment by natural smelt reproduction, and consequently enhance the smelt production in Lake Nojiri.
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Acknowledgements
We thank the Lake Nojiri Fisherman’s Cooperative Association for their agreement to allow observation and sampling of eggs in Lake Nojiri as well as providing helpful background information. We also thank Mamoru Matsuki (Issa Restaurant) for providing valuable background information and assisting with fieldwork and Yoichi Kondo (Nojiriko Naumann’s Elephant Museum) for providing background information and assisting with experimental design. Author MIP is a Research Fellow of Japan Society for the Promotion of Science.
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Peterson, M.I., Kitano, S. & Ida, H. Resident spawning of Japanese smelt, Hypomesus nipponensis, along gravel shorelines in Lake Nojiri, Central Japan. Landscape Ecol Eng 17, 547–554 (2021). https://doi.org/10.1007/s11355-021-00462-x
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DOI: https://doi.org/10.1007/s11355-021-00462-x