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Diseases of Aquatic Organisms

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DAO 77:199-205 (2007)  -  DOI:

Efficacy of orally administered praziquantel against Zeuxapta seriolae and Benedenia seriolae (Monogenea) in yellowtail kingfish Seriola lalandi

Rissa E. Williams1,3,*, Ingo Ernst1,4, Clinton B. Chambers1,5, Ian D. Whittington1,2

1School of Earth and Environmental Sciences, Darling Building, DP418, The University of Adelaide, Adelaide, South Australia 5005, Australia
2Parasitology Section, The South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
3Present address: Investigation and Diagnostic Centre–Wallaceville, Biosecurity New Zealand, Ministry of Agriculture and Forestry, PO Box 40742, Ward Street, Upper Hutt 5018, New Zealand
4Present address: Aquatic Animal Health Unit, Product Integrity, Animal and Plant Health, Australian Government Department of Agriculture, Fisheries and Forestry, GPO Box 858, Canberra, Australia Capital Territory 2601, Australia
5Present address: Worley Parsons Ltd., Level 3, QV1 Building, 250 St. Georges Terrace, Perth, Western Australia 6000, Australia

ABSTRACT: We investigated the efficacy of praziquantel (PZQ) administered orally to yellowtail kingfish (Seriola lalandi in sea-cage aquaculture in South Australia) against the monogeneans Zeuxapta seriolae and Benedenia seriolae infesting gills and skin, respectively. PZQ was administered to fish by surface-coating feed pellets (Trial 1) or by direct intubation of the stomach (Trial 2). In both trials 4 daily doses were administered: 50 and 75 mg kg–1 body weight (BW) d–1 for 6 d, and 100 and 150 mg kg–1 BW d–1 for 3 d. Mean parasite intensity was compared between medicated fish and unmedicated control fish. In Trial 1, fish fed lower daily doses of PZQ for 6 d (50 and 75 mg kg–1 BW d–1) had fewer Z. seriolae and B. seriolae than fish fed higher daily doses for 3 d (100 and 150 mg kg–1 BW d–1). Fish rejected feed pellets surface-coated with PZQ, suggesting PZQ affected palatability of feed, and may explain differences in efficacy between treatments. In Trial 2, where PZQ was administered by intubation, there were fewer Z. seriolae and B. seriolae in medicated fish than control fish. Intubated PZQ was also effective against newly recruited Z. seriolae and B. seriolae. PZQ could be developed as a useful treatment for Z. seriolae and B. seriolae parasitising S. lalandi in sea-cage aquaculture if suspected palatability problems are resolved.

KEY WORDS: Monogenea · Sea-cage aquaculture · Oral treatment · Anthelmintic · Seriola lalandi

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Cite this article as: Williams RE, Ernst I, Chambers CB, Whittington ID (2007) Efficacy of orally administered praziquantel against Zeuxapta seriolae and Benedenia seriolae (Monogenea) in yellowtail kingfish Seriola lalandi. Dis Aquat Org 77:199-205.

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