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Title:   Author  item
                                            Straus, David

                                                         - *Dave*item
                                            Mitchell, Andrewitem
                                            MEINELT, THOMAS - Leibniz Institute
  Submitted to: Book of Abstracts Aquaculture America
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/20/2010
                                    Publication  Date: 2/28/2011
                                    Citation: Straus, D.L., Mitchell, A.J., Meinelt, T. 2011. Using peracetic acid to control fungus on catfish eggs [abstract]. Book of Abstracts Aquaculture America. p.446.Interpretive Summary:
                                Technical Abstract: A promising new treatment for parasites and egg fungi is peracetic acid (PAA; also called peroxyacetic acid).  It is registered with the U.S. Environmental Protection Agency (EPA) as an oxidizing agent used as an antimicrobial compound approved for indoor use on hard, non-porous surfaces.  This study looks at the use of PAA for fungus (Saprolegnia sp.) control in catfish hatcheries.  A range-finding study was designed to determine the optimum concentration needed for fungus control on channel catfish eggs in 23.5°C well water.  Channel catfish were spawned on-site and spawns were moved to the hatching lab within 24 hrs.  Similar portions (~90 g) of a spawn were placed into mesh baskets of individual compartments of a custom hatching trough (n=4) and acclimated for 1 hr.  Egg counts were also determined for each spawn to estimate number of eggs in each portion.  The study consisted of 5 PAA concentrations (2.5, 5, 10, 15, and 20 mg/L) and an untreated control.  Eggs were treated twice daily in a flow-through system until the hatching began.  Water chemistry for the well water was pH 7.7, 243 mg/L total alkalinity, and 127 mg/L total hardness.  When hatching was complete for all viable eggs, fry were siphoned into individual jars containing 70% ethanol and counted within a few days to determine the percent of fry that hatched in each treatment.  Fungus was severe in the untreated controls (12% survival) and an optimum treatment of 2.5 mg/L PAA twice daily was sufficient to control fungus (60% survival).  Very little fungus was present in treatments receiving 2.5 mg/L PAA or higher (Table 1), but at 15 ppm PAA and higher, toxicity to the eggs was observed and resulted in significantly lower hatch rates.


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