Physiological and biochemical aspects of ozone toxicity to rainbow trout (Salmo gairdneri)

Journal of the Fisheries Research Board of Canada
By: , and 

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Abstract

An acute toxicity curve for dissolved ozone (O3) in soft water at 10 °C, using 10–13-cm rainbow trout (Salmo gairdneri) as the test species was calculated. The 96-h LC50 (95%, confidence interval) was 9.3 (8.1–10.6) μg/L. The lethal threshold level was about 8 μg/L mandating that a conservative margin of safety be used if ozone is employed as a fish disease control agent. Death apparently results from massive destruction of the gill lamellar epithelium together with a severe hydromineral imbalance. In partial chronic (3-mo) testing, 2 μg/L caused no significant biological damage while 5 μg/L caused some gill pathological changes and reduced feeding behavior. Accordingly, 2 μg/L is suggested as a provisional maximum safe exposure level, pending completion of life cycle studies. Thus, if ozone-treated water is discharged into the environment, dissolved O3 should be reduced to at least the 2 μg/L level to minimize adverse impacts on salmonids in receiving waters.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Physiological and biochemical aspects of ozone toxicity to rainbow trout (Salmo gairdneri)
Series title Journal of the Fisheries Research Board of Canada
DOI 10.1139/f79-088
Volume 36
Issue 6
Year Published 1979
Language English
Publisher NRC Research Press
Contributing office(s) Western Fisheries Research Center
Description 10 p.
First page 605
Last page 614
Online Only (Y/N) N
Additional Online Files (Y/N) N