Ukai in general is performed at night, but Kiso-gawa ukai is unique in that Hiru Ukai (daytime cormorant fishing) is also carried out (on Tuesdays, Thursdays and Saturdays), adding to the normal night ukai.
鵜飼は基本的に夜に行なう漁法であるが、木曽川うかいは、夜の鵜飼の他に、昼間に行なう鵜飼である「昼鵜飼」を唯一行なっている（毎週火・木・土曜日）。