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Influence of Oxygen on the Toxicity of Chloramine-T to Atlantic Salmon Smolts in Freshwater and Seawater

Citation

Powell, MD and Harris, J, Influence of Oxygen on the Toxicity of Chloramine-T to Atlantic Salmon Smolts in Freshwater and Seawater, Journal of Aquatic Animal Health, 16, (2) pp. 83-92. ISSN 0899-7659 (2004) [Refereed Article]

DOI: doi:10.1577/H03-050.1

Abstract

Chloramine-T is a widely used disinfectant for the treatment of gill diseases of fish in freshwater, and more recently attention has turned to its use in seawater. However, despite the wide use of chloramine-T, few studies have examined its acute toxicity to fish. In this study we examined the acute (within 12 h) toxicity of freshwater- and seawater-acclimated Atlantic salmon Salmo salar smolts under aerated (100% air saturation with O 2) and oxygen supersaturation conditions (200% air saturation with O 2). Chloramine-T was more acutely toxic to salmon in seawater than to those in freshwater, and oxygen supersaturation enhanced the toxicity in both sea- and freshwater. In aerated freshwater the median lethal times (LT50s) for chloramine-T concentrations of 50 and 25 mg/L were 166.8 and 474.3 min, respectively; in aerated seawater they were 119.1 and 297.3 min, respectively. However, in freshwater at 200% air saturation with oxygen, the 50 and 25 mg/L LT50s were 133.6 and 190.9 min, respectively; in seawater at 200% air oxygen saturation, the values were 85.3 and 158.9 min, respectively. Freshwater Atlantic salmon appear to be as sensitive as rainbow trout Oncorhynchus mykiss and more sensitive than channel catfish Ictalurus punctatus to chloramine-T toxicity. Seawater-acclimated salmon, however, appear to be more sensitive to chloramine-T than are trout and catfish. The primary mechanism of toxicity in both seawater and freshwater appears to be extensive oxidative necrosis of the gill filament and lamellar epithelium, causing acute osmoregulatory dysfunction.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Powell, MD (Dr Mark Powell)
Author:Harris, J (Dr James Harris)
ID Code:30480
Year Published:2004
Web of Science® Times Cited:10
Deposited By:TAFI - Aquaculture
Deposited On:2004-08-01
Last Modified:2005-05-02
Downloads:0

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