noun
fish weir; fish trap
A traditional structure placed in rivers to catch fish, especially ayu (sweetfish).
川に梁を仕掛けて鮎を捕る。
They set up a fish weir in the river to catch sweetfish.
The origin is uncertain; the kanji 梁 originally refers to a beam or bridge, and its use for a fish weir may be an extension or a borrowing.