Journal of Applied Aquaculture Volume 23, Number 3 (July 2011) 
Dose-Confirmation of Copper Sulfate for Treating Fungus on Channel Catfish, Ictalurus punctatus, Eggs at a Commercial Hatchery Authors: DavidL. Straus 1 Author Affiliations:
| 1: | Mississippi State University, Thad Cochran National Warmwater Aquaculture Center |
Source: Journal of Applied Aquaculture, Volume 23, Number 3 (July 2011) Page Numbers: 199 – 206
Abstract: This study at a commercial hatchery was required by the U.S. Food and Drug Administration to provide independent substantiation of the results of previous laboratory dose-confirmation studies on the use of copper sulfate (CuSO4) to control fungus (Saprolegniaspp.) on the eggs of channel catfish, Ictalurus punctatus. The study compared an untreated control group of eggs to eggs treated with 10 mg/L CuSO4 in a flow-through system; mean water temperature was 23.5°C. Eggs were treated once daily until the embryos reached the eyed stage (5 treatments). Hatching was complete by day 11, and fry were counted to determine the percentage of survival in each treatment. Fungus was identified by polymerase chain reaction (PCR) as Saprolegnia spp. The mean survival in the control treatments was 4% and 40% in the CuSO4 treatments; the latter survival was significantly higher, but still lower than normal. This study confirms that 10 mg/L CuSO4is an effective treatment to control fungus on catfish eggs when used daily until the eggs are eyed. However, continued treatment of eggs until hatching occurs may be warranted based on fungal growth rates observed after treatments were discontinued.
Citation: DavidL. Straus . Dose-Confirmation of Copper Sulfate for Treating Fungus on Channel Catfish, Ictalurus punctatus, Eggs at a Commercial Hatchery. Journal of Applied Aquaculture, Volume 23, Number 3 (July 2011), pp. 199-206, <http://ejournals.ebsco.com/direct.asp?ArticleID=429FAD4F6F91CDCAF863>
URL: http://ejournals.ebsco.com/direct.asp?ArticleID=429FAD4F6F91CDCAF863