Ichthyological Research

, Volume 66, Issue 3, pp 319–329 | Cite as

Contrasting effects of dams with and without reservoirs on the population density of an amphidromous goby in southwestern Japan

  • Yoshifumi Sumizaki
  • Ryota Kawanishi
  • Mikio InoueEmail author
  • Motohiro Takagi
  • Koji Omori
Full Paper


Dam construction affects the distribution and abundance of freshwater fishes, particularly for diadromous species. Amphidromous fishes spawn in rivers, and hatched larvae descend to the sea (or standing water body such as lakes) immediately after hatching, grow there typically for a few months, and then ascend rivers as small juveniles. Landlocked populations of amphidromous fishes above dams and their migration between dam reservoirs and inlet streams (landlocked migration) have often been reported. In these cases, population density in the inlet streams may be increased by dam reservoirs, owing to reduced migration distance, which results in higher return rates. On the other hand, dams without reservoirs do not promote landlocked migration and merely act as a barrier to their upstream migration, resulting in decreased population density. In this study, we examined such contrasting effects of dams with and without reservoirs on the population density of an amphidromous goby, Rhinogobius fluviatilis, in two river systems (the Shigenobu and Yoshino Rivers) of Shikoku Island, Japan. In the Shigenobu River, where more than 300 sediment-control dams and weirs (barriers without reservoirs) have been installed, our analysis showed that the goby density decreased sharply with increasing the number of barriers higher than or equal to 2 m. On the other hand, in the Yoshino River, where we investigated both landlocked populations above water storage dams (with reservoirs) and non-landlocked populations in tributaries without water storage dams, the analysis showed that the goby density increased with decreasing the distance from standing water body (i.e. the sea or dam reservoirs). Furthermore, monthly surveys at sites above and below a water storage dam showed that the recruitment of ascending juveniles above the dam was more abundant and seasonally earlier than that below the dam, probably owing to reduced migration distance and increased return rates. Our results have implications for understanding how dams alter natural distribution patterns of amphidromous fishes.


Amphidromy Barrier effect Landlocking Migration Rhinogobius 



We are grateful to Shugo Kikuchi, Nobuyoshi Kotera, Yasutaka Hida, Satoshi Yano, Yuta Kudo and Yuka Fujiwara for help in the field, and Takaaki Shimizu, Masaki Shibuya, Jyun-ya Shibata, Tadao Kunihiro, Hidejiro Onishi and Hideki Hamaoka for various advice throughout the study. We also thank two anonymous reviewers for useful comments that improved the manuscript. This research was supported by a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (JSPS KAKENHI Grant number 19510236 to M. Takagi), a grant from the Water Resources Environment Center (to K. Omori and M. Inoue), and partly by the Environmental Research and Technology Development Fund (S9) of the Ministry of Environment, Japan. The survey in this study was conducted with the permission of Ehime Prefectural Government and complied with the current laws in Japan.


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Copyright information

© The Ichthyological Society of Japan 2019

Authors and Affiliations

  • Yoshifumi Sumizaki
    • 1
  • Ryota Kawanishi
    • 1
    • 4
  • Mikio Inoue
    • 1
    Email author
  • Motohiro Takagi
    • 2
    • 5
  • Koji Omori
    • 3
  1. 1.Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  2. 2.Faculty of AgricultureEhime UniversityMatsuyamaJapan
  3. 3.Center for Marine Environmental StudiesEhime UniversityMatsuyamaJapan
  4. 4.Faculty of Environmental Earth ScienceHokkaido UniversitySapporoJapan
  5. 5.South Ehime Fisheries Research CenterEhime UniversityAinanJapan

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