We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Use of Copper Sulfate to Control Egg Saprolegniasis at a Commercial Sunshine Bass Hatchery.
- Authors
Straus, David L.; Farmer, Bradley D.; Ledbetter, Cynthia K.; Beck, Benjamin H.; Williams, Rick S.; Clark, Mike L.; Freeze, T. Mike
- Abstract
An obstacle to the larval production of sunshine bass (female White BassMorone chrysops× male Striped BassM. saxatilis) is fungal growth on the eggs caused by the water mold,Saprolegniaspp. Copper sulfate (CuSO4) is commonly used for fungus control in troughs at catfish hatcheries, but the effectiveness in other fish-egg hatching systems is unknown. Because sunshine bass eggs begin hatching after 48 h, CuSO4treatments (0, 10, 20, and 40 mg/L) began the afternoon of spawning with a 10-min, aerated, static bath and were repeated the morning and afternoon of day 2; eggs were not treated after hatching began. An in vitro assay was developed for this treatment regimen that indicated maximum fungal inhibition was achieved with 20 mg/L CuSO4. In the effectiveness experiment in McDonald hatching jars (n= 3), fungus was severe in the untreated controls (27.7% survival), but very little fungus was present in treatments receiving 10 mg/L CuSO4(31.4% survival) or higher. The control was not significantly different from the 10-mg/L treatment. The highest survival was at 40 mg/L CuSO4(50.5% survival); however, the survival from the 20-mg/L CuSO4treatment (45.8%) was not significantly different from that in the 40-mg/L treatment and thus allows for a greater margin of safety. Fungus samples were identified asSaprolegnia feraxthrough genetic sequencing. Toxicity experiments on sunshine bass larvae indicated the 24- and 48-h LC50 values were 5.4 and 3.9 mg/L CuSO4, respectively; the no observed effect concentrations were 0.5 and 0.25 mg/L CuSO4, respectively. This study confirms that CuSO4can be an economical and valuable resource in hatchery management for the control of saprolegniasis on sunshine bass eggs in McDonald jars. Received September 25, 2015; accepted January 20, 2016 Published online June 15, 2016
- Subjects
HYBRID bass; FISH hatcheries; COPPER sulfate; FISH eggs; FUNGAL diseases of fish; AQUACULTURE stations
- Publication
North American Journal of Aquaculture, 2016, Vol 78, Issue 3, p243
- ISSN
1522-2055
- Publication type
Article
- DOI
10.1080/15222055.2016.1146183