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Comparative Responses of Speckled Dace and Cutthroat Trout to Air‐Supersaturated Water
Author(s) -
Nebeker Alan V.,
Hauck A. Kent,
Baker Faye D.,
Weitz Stephen L.
Publication year - 1980
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(1980)109<760:crosda>2.0.co;2
Subject(s) - trout , fishery , environmental science , biology , fish <actinopterygii> , zoology
Speckled dace (Rhinichthys osculus) are more tolerant of air‐supersaturated water than adult or juvenile cutthroat trout (Salmo clarki). Speckled dace were tested in concentrations from 110 to 142% saturation and had a 96‐hour median lethal concentration (LC50) of 140%, a 7‐day LC50 of 137%, and 2‐week LC50ˈs of 129 and 131% saturation. The estimated mean threshold concentration, based on time to 50% death (TM50), was 123% saturation. The speckled dace also exhibited consistent external signs of gas bubble disease. Cutthroat trout were tested from 111 to 130% saturation and had 96‐hour LC50ˈs of 119 and 120% (adults) and 119 and 119% (juveniles) saturation. Estimated mean threshold concentrations (from TM50 values) were 117% (adults) and 114% (juveniles) saturation. Signs of gas bubble disease exhibited by the cutthroat trout were similar to those seen with other salmonids examined in earlier studies.