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The respiratory effects of chloramine-T exposure in seawater acclimated and amoebic gill disease-affected Atlantic salmon Salmo salar L

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Leef, MJ, Harris, JO and Powell, MD 2007 , 'The respiratory effects of chloramine-T exposure in seawater acclimated and amoebic gill disease-affected Atlantic salmon Salmo salar L' , Aquaculture, vol. 266, no. 1-4 , pp. 77-86 , doi: 10.1016/j.aquaculture.2006.12.032.

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Abstract

The aim of the present study was to examine the respiratory effects of chloramine-T, a proposed novel chemotherapeutic treatment for seawater-acclimated Atlantic salmon Salmo salar (L.) affected by amoebic gill disease (AGD). Following a surgical recovery period of 20–24 h, fish, both healthy (N = 21) and AGD-affected (N = 13) were exposed to either a 1-hour pulse of seawater containing chloramine-T at a therapeutic concentration of 10 mg L− 1 (experimental), or 100 ml of sterile seawater (sham-treated controls). Arterial blood samples were repeatedly taken from a dorsal aortic catheter prior to exposure (0 h), immediately following exposure (1 h) and then at 3, 6, 12 and 24 h and various respiratory parameters measured. Results showed that there were no significant effects relating to chloramine-T exposure regardless of disease status. Additional examination of the pH-bicarbonate diagrams confirmed that there was minimal acid–base disturbance in fish exposed to chloramine-T regardless of disease status. Significant changes seen within the examined haematological parameters of both healthy and AGD-affected fish appeared to be related to the repeated withdrawal of blood for analysis of respiratory parameters. Overall these results suggest that the use of chloramine-T in full-strength seawater at the therapeutic concentration of 10 mg L− 1 for 1 h had no significant respiratory effect in healthy or AGD-affected Atlantic salmon. Additionally, these results help to highlight the potential beneficial use of chloramine-T as a commercial treatment for gill diseased in marine Atlantic salmon.

Item Type: Article
Authors/Creators:Leef, MJ and Harris, JO and Powell, MD
Keywords: Amoebic gill disease; Chloramine-T; Respiratory physiology; Atlantic salmon
Journal or Publication Title: Aquaculture
Publisher: Elsevier BV
ISSN: 0044-8486
DOI / ID Number: 10.1016/j.aquaculture.2006.12.032
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