Morphometric and histochemical assessment of the branchial tissue response of rainbow trout, Oncorhynchus mykiss (Walbaum), associated with chloramine-T treatment |
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| Authors: | J G Sanchez D J Speare & G J Johnson |
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| Institution: | Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island,Charlottetown, Prince Edward Island, Canada |
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| Abstract: | Twelve tanks of juvenile rainbow trout, Oncorhynchus mykiss (Walbaum), were treated twice weekly for an 11- week period with a one-hour static bath of chloramine-T (10 mg l–1). The morphometric indices of gill damage and the histochemical characteristics of gill mucous cells of fish from treated and paired untreated tanks were compared. The use pattern of chloramine-T in this study evoked a slight increase in mean lamellar width, but it did not induce a greater degree of lamellar oedema, lamellar fusion, tissue infiltration, epithelial hyperplasia, chloride cell metaplasia or thrombosis of pillar channels in treated fish. Treatment caused a trend towards an increased number of mucous cells on lamellae, associated with a significant shift from neutral mucin to acid mucin production based on histochemical characteristics. |
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