fish pass

DCHP-1 (pre-1967)

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an artificial lock built to assist fish in passing a waterfall or other obstruction on their way upstream to spawn.

Quotations

1879

The principle of this scheme is, I may say at once and without hesitation, the very best which can be devised for an artificial fish pass.

1959

The Hydro Board has adopted an ingenious fish pass, operating on the principle of a canal lock.