La mer
Online ISSN : 2434-2882
Print ISSN : 0503-1540
東日本の海跡湖 「北浦」 に流入する農業水路における遡上魚類の季節変化
浜野 隼 木村 将士加納 光樹
ジャーナル フリー

2022 年 60 巻 3-4 号 p. 25-35


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.

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