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Behavior of Juvenile Chinook Salmon (Oncorhynchus tshawytscha) in Relation to Simulated Thermal Effluent
Author(s) -
Gray R. H.,
Genoway R. G.,
Barraclough S. A.
Publication year - 1977
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1977)106<366:bojcso>2.0.co;2
Subject(s) - chinook wind , oncorhynchus , plume , raceway , juvenile , environmental science , fishery , effluent , fish <actinopterygii> , ecology , biology , meteorology , materials science , environmental engineering , physics , composite material , lubrication
Instantaneous responses of juvenile salmonids that encounter a simulated river‐thermal plume interface were assessed in a model raceway with a thermal discharge. Fish movement and response to the discharge were recorded on videotape. Juvenile chinook salmon (Oncorhynchus tshawytscha) tested under three discharge conditions (no plume, ambient plume, and heated plume) avoided heated plumes when plume Δ Tˈs were greater than 9–11 C above ambient. Fish occasionally oriented to the discharge current, but were not attracted to the thermal component of the plume when plume Δ Tˈs were below the avoidance level of 11 C. Fish did not pass to the lower end of the raceway when plume Δ T exceeded 9–11 C.