DCHP-1 Online
fish pass 
an artificial lock built to assist fish in passing a waterfall or other obstruction on their way upstream to spawn.
See also: fish ladder fishway
- 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.
- 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.