Effects of intermittent exposure to therapeutic ...



Title Effects of intermittent exposure to therapeutic levels of formalin on growth characteristics and body condition of juvenile rainbow trout
Author(s) David J. Speare, N. MacNair
Journal Journal of Aquatic Animal Health
Date 1996
Volume 8
Issue 1
Start page 58
End page 63
Abstract The effects of twice weekly exposure to formalin [formaldehyde] (200 mg/litre in a 1-h static bath) on juvenile rainbow trout Oncorhynchus mykiss (57.4 g initial weight) were assessed in a 12-week growth trial. Growth rates, appetite, feed conversion and body condition index of fish were not significantly affected by formalin treatment after 6 and 12 weeks. There was no evidence of a cumulative effect of formalin treatments over time, because the similarities between treated and untreated groups of fish persisted over the 12-week trial. Formalin-treated fish had significantly better fin condition and a lower incidence of corneal opacity than did untreated fish. It is concluded that formalin in a 1-h static bath at 200 mg/litre repeated twice weekly, can be used as a disease prophylaxis regime with no negative effects on growth..

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