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A Saprolegnia parasitica challenge system for rainbow trout: assessment of Pyceze as an anti-fungal agent for both fish and ova

Pottinger, T.G.; Day, J.G.. 1999 A Saprolegnia parasitica challenge system for rainbow trout: assessment of Pyceze as an anti-fungal agent for both fish and ova. Diseases of Aquatic Organisms, 36. 129-141. 10.3354/dao036129

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Abstract/Summary

A reproducible Saprolegnia parasitica spore delivery system was developed and demonstrated to be effective in providing a sustained spore challenge for up to 10 days. Treatment of rainbow trout with slow-release intraperitoneal implants containing cortisol resulted in chronically elevated blood cortisol levels and rendered the fish susceptible to infection by S. parasitica when exposed to the spore challenge. Sham-implanted fish were not susceptible to infection. Bronopol (2-bromo-2-nitropropane-1,3-diol), formulated as Pyceze, was effective in protecting predisposed fish from infection by S. parasitica when administered as a daily bath/flush treatment at concentrations of 15 mg l-1 and greater. Pyceze was also demonstrated to protect fertilised rainbow trout ova from S. parasitica challenge when administered as a daily bath/flush treatment at concentrations of between 30 and 100 mg l-1. Pyceze appears to qualify as a safe and effective replacement for malachite green and formalin in the prevention of fungal infections in the aquaculture environment.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.3354/dao036129
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Pre-2000 sections
ISSN: 0177-5103
Additional Information. Not used in RCUK Gateway to Research.: Click on the Official URL to access freely available full text
Additional Keywords: Saprolegnia, fungal infection, rainbow trout, Oncorhynchus mykiss, bronopol, Pyceze, cortisol, stress
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 16 Jul 2015 08:37 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/510854

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