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Effects of Repetitive Formalin Treatments on Channel Catfish Juveniles
Author(s) -
Bodensteiner Leo R.,
Sheehan Robert J.,
Lewis William M.,
Wills Paul S.,
Herman Roger L.
Publication year - 1993
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1993)005<0059:eorfto>2.3.co;2
Subject(s) - catfish , biology , hyperplasia , fish <actinopterygii> , body weight , anatomy , gill , ictaluridae , muscle hypertrophy , zoology , physiology , veterinary medicine , fishery , ictalurus , endocrinology , medicine
Channel catfish Icialurus punctatus ranging from 70 to 148 mm in total length were treated with formalin at a concentration of 25 μL/L for 4 h daily on four successive days each week over a 28‐week period beginning in mid‐September. Coefficients of condition (weight‐tolength ratios) and histological examinations of gill tissues were used to evaluate health of fish exposed to formalin. Gill tissues of both formalin‐treated and untreated fish showed effects typical of intensive culture, including hypertrophy, hyperplasia, and excess mucous secretion; no differences were found in gill morphometry between the two groups. Channel catfish periodically treated with formalin had a significantly higher coefficient of condition (P < 0.05) after 28 weeks and no indication of adverse effects attributable to formalin.