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Morphometric and histochemical assessment of the branchial tissue response of rainbow trout, Oncorhynchus mykiss (Walbaum), associated with chloramine‐T treatment
Author(s) -
Sanchez J G,
Speare D J,
Johnson G J
Publication year - 1997
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1046/j.1365-2761.1997.00312.x
Subject(s) - rainbow trout , biology , hyperplasia , juvenile , anatomy , gill , fishery , andrology , pathology , fish <actinopterygii> , endocrinology , ecology , medicine
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.