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Upstream Passage of Adult Salmon Through an Unlit Tunnel
Author(s) -
Rogers A.,
Cane A.
Publication year - 1979
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1979.tb00259.x
Subject(s) - weir , upstream (networking) , fish <actinopterygii> , fishery , water tunnel , biology , hydrology (agriculture) , oceanography , meteorology , geotechnical engineering , engineering , geology , telecommunications , physics , geography , cartography , vortex
SUMMARY After conversion of a lake, previously a part of a river system in Gwynedd, North Wales, to a pumped storage reservoir, salmon will be faced with a 2.2 km long diversion tunnel in order to reach parts of their former spawning grounds. The unlit tunnel is described, with notes on water velocities under various discharge conditions. A fish counter, mounted at the peak of the fish pass in the upstream (intake) weir of the tunnel, has indicated that, in the first spawning season following construction of the tunnel, numbers of adults have succeeded in negotiating tunnel and weir, despite the hitherto‐assumed unattractive conditions of low velocity and complete darkness.