Theses and Dissertations


Title: Control of Gyrodactylus sp. on goldfish

Name: Kumar, A. K. Gopi

Degree: MS

Chair: Dr. H.S. Swingle and Dr. Ray Allison

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1958

Pages: 56

Keywords: Control,Gyrodactylus,Goldfish.

Abstract:

Gyrodactyliasis causes considerable loss of fish in ponds. Control measures for these parasites in warmwater fish ponds are especially needed. In April, 1956, there was a severe outbreak of Gyrodactylus on goldfish in one of the ponds of the Alabama Polytechnic Institute Agricultural Experiment Station, causing loss of several hundreds of fish. This investigation was designed to test the efficacy of KMnO4, K2Cr2O7, formalin, acetic acid, Roccal, methylene blue, PMA and Lysol for controlling these parasites. A stock of parasitized goldfish, mostly 2- and 3-inch groups, was maintained in stainless steel troughs. The rates of flow of water and feeding were found to influence the extent of parasitization of fish. Tests of 48-hour and 168-hour duration were conducted in dechlorinated tap water. Potassium permanganate, K2Cr2O7, and formalin were tested in pond water from two sources in experiments of 48-hour duration. Potassium permanganate was also used at 5 p.p.m. in tap water for 2-, 4- and 8-hour exposure periods. The efficacy of these chemicals was evaluated in terms of the number of parasites remaining on the fish after treatment. The number of parasites remaining on the fish was determined by immersing the fish in a bath of 1:1000 Lysol solution for 5 minutes. This caused the parasites to detach themselves from the fish, and this number was determined by counting. Lysol solution was found more efficient than Cresol solutions for removal of the attached parasites. In 48-hour exposure periods in tap water, KMnO4 at 3 and 5 p.p.m., K2Cr2O7 at 15 and 20 p.p.m., and formalin at 10 and 15 p.p.m. were found to control these parasites with little or no mortality of fish. Pyridylmercuric acetate gave approximately 100 per cent control of these parasites at concentrations of 0.75, 1.0 and 1.5 p.p.m., and caused very little mortality of fish in tests of 48-hours duration. In tap water, only one concentration of all chemicals was used in tests of 168-hour duration. None of these gave a 100 per cent control of the parasites: however, PMA at 0.75 p.p.m. caused 100 per cent mortality of fish. In pond water containing considerable plankton, within an exposure period of 48 hours, potassium dichromate at 20 p.p.m. gave a higher percentage control than KMnO4 at 5 p.p.m. or formalin at 15 p.p.m. In pond water containing less plankton, formalin at 15 p.p.m. gave a 97.2 per cent control of parasites, while KMnO4 at 5 p.p.m. and K2Cr2O7 at 20 p.p.m. resulted in 46.3 and 64.7 per cent control respectively. In tap water, potassium permanganate at 5 p.p.m. gave approximately 100 per cent control of these parasites within 4 hours.

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