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Use of Formalin Treatments During Incubation of Eyed Eggs of Brown Trout
Author(s) -
Barnes Michael E.,
Sayler William A.,
Cordes Rick J.
Publication year - 2001
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(2001)063<0333:uoftdi>2.0.co;2
Subject(s) - brown trout , biology , salmo , hatchery , saprolegnia , trout , incubation , embryo , fishery , zoology , fish <actinopterygii> , biochemistry
To test the efficacy of formalin in controlling the fungus Saprolegnia , we administered daily formalin treatments (1,667 mg/L for 15 min) to embryos (eyed eggs to hatch) of brown trout Salmo trutta and compared their survival with that of untreated embryos. The study was conducted each year from 1996 to 1998. In all 3 years, embryo survival to hatch in both groups was greater than 90%. Survival to hatch was not significantly improved in the treated trays of eggs compared with the untreated trays, where dead eggs were manually removed for Saprolegnia control. Both formalin treatments and hand‐picking of dead eggs adequately controlled visible fungal development. Although not essential for fungal control, formalin treatments on high‐quality brown trout eggs from the eyed stage of embryo development through hatch are recommended to provide reductions in hatchery labor, but only if they can be administered safely.