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Upper Midwest Environmental Sciences Center

Fisheries Restoration

Field Effectiveness of 35% PEROX-AID® (Hydrogen Peroxide) to Reduce Gyrodactylus sp. Infestation Density in Coolwater and Warmwater Finfish

Principal Investigator:

Impact of UMESC Science

The results from this study may lead to an expansion of the 35% PEROX-AID® label allowing for the use of the drug to control coolwater and warmwater finfish mortality associated with a parasitic infestation.  Label expansion would enhance coldwater finfish production on all hatcheries throughout the United Sates.

Introduction

Parasitic infestations occur frequently in hatcheries due to high fish densities and the high reproductive rate of parasites. The most economically important monogenean in cultured fish is the monopisthocotylean Superfamily Gyrodactyloidea. Monogeneans are common parasites of the skin and gills of both marine and freshwater fish (Hoffman 1967, Noga 1996). Monogeneans can rapidly reproduce and the doubling time for the viviparous Gyrodactylus is as little as 24 hours. Monogeneans feed mainly on the superficial layers of the skin and gills. Feeding on the skin and gills is irritating to the fish and often causes skin cloudiness or focal reddening resulting from excess mucus production, epithelial hyperplasia or hemorrhaging (Kabatta 1985). Parasite induced tissue damage may increase susceptibility to secondary fungal or bacterial infections (Lasee 1995). Therefore, it is important to prevent or control parasitic infestations on fish.

Objective

Confirm the efficacy of 35% PEROX-AID® (35% w/w hydrogen peroxide; Eka Chemicals, Inc.) to reduce Gyrodactylus sp. infestation density on cool and warmwater finfish.

References

Hoffman, G. L. editor. 1967. Parasites of North American Freshwater Fishes.  University of California Press, Los Angeles, California.

Kabata, Z. 1985. Parasites and diseases of cultured fish in the tropics, London, Taylor and Francis.

Lasee, B.A. 1995. Introduction of Fish Health Management. 2nd Edition. Fish and Wildlife Publication. 139 pp.

Noga, E.J. 1996. Columnaris infection (Myxobacterial disease, peduncle disease, saddleback, fin rot, cotton wool disease, black patch necrosis).  Pages 122-126 in L. L. Duncan, editor.  Fish disease: diagnosis and treatment.  Mosby Publishing, St. Louis, Missouri.

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