- 著者
- 
             
             浜野 隼
             
             木村 将士
             
             加納 光樹
             
          
- 出版者
- 日仏海洋学会
- 雑誌
- La mer (ISSN:05031540)
- 巻号頁・発行日
- vol.60, no.3-4, pp.25-35, 2022-12-28 (Released:2023-01-14)
        Seasonal changes in upstream movements of fishes were examined  in  an  irrigation ditch flowing into an inland-sea lake, Kitaura, Ibaraki Prefecture, eastern Japan, from April 2020  to March 2021. A total of 1,762 individuals representing 6 families and 12 species were collected using small fyke nets throughout the study period. The most abundant species were the gobiid Rhinogobius  sp.  OR(70.8%  of  the  total  number  of  individuals  collected),  the  gobiid  Gymnogo- bius  urotaenia(22. 5%),  the  cobitid  Misgurnus  anguillicaudatus(2. 7%),  the  gobiid  Tridentiger brevispinis(1.7%)and the cyprinid Gnathopogon elongatus elongatus(1.1%). Based on the body sizes, developmental stages and seasonal occurrence patterns of fishes sampled, it is highly likely that the irrigation ditch would be used as a place of temporary growth and spawning by several fishes including amphidromous gobiids.