Carbon Dioxide and Oxygen-Nitrogen Ratios as Factors Affecting Salmon Survival in Air-Supersaturated Water
- 1 May 1976
- journal article
- research article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 105 (3) , 425-429
- https://doi.org/10.1577/1548-8659(1976)105<425:cdaora>2.0.co;2
Abstract
Juvenile sockeye salmon (Oncorhynchus nerka) were exposed to lethal levels of air-supersaturated water (120%, 125%, 130% total gas saturation) containing different O2/N2 ratios and different CO2 concentrations. Fish mortality was not significantly different at different CO2 levels (1.7-22.0 mg/l CO2) when tested at the same total gas saturation concentrations. Total gas saturation levels are much more important than the O2/N2 ratios, as fish mortality will not occur unless total gas saturation exceeds 100%, regardless of the O2/N2 ratios. There was a significant decrease in mortality when the O2/N2 ratio was increased while holding the total percent saturation constant. Much more extensive and severe signs of gas bubble disease developed at high O2/N2 ratios than at low O2/N2 ratios, indicating that O2 plays a significant part in forming external emphysema and lesions.This publication has 1 reference indexed in Scilit:
- Effects of Air-Supersaturated Water on Survival of Pacific Salmon and Steelhead SmoltsTransactions of the American Fisheries Society, 1976