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Diseases of Aquatic Organisms

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DAO 65:69-74 (2005)  -  doi:10.3354/dao065069

Population dynamics of the philometrid nematode Margolisianum bulbosum in the southern flounder Paralichthys lethostigma (Pisces: Paralichthyidae) in South Carolina, USA

Claire Golléty1, Vincent A. Connors2, Ann M. Adams3, William A. Roumillat4, Isaure de Buron1,*

1Department of Biology, College of Charleston, 58 Coming Street, Charleston, South Carolina 29401, USA
2Department of Biology, University of South Carolina-Upstate, 800 University Way, Spartanburg, South Carolina 29301, USA
3US Food and Drug Administration, Kansas City District Laboratory, Lenexa, Kansas 66214, USA
4Department of Natural Resources, PO Box 12559, Fort Johnson Road, Charleston, South Carolina 29422, USA
*Corresponding author. Email:

ABSTRACT: This is the first report of the philometrid nematode Margolisianum bulbosum Blaylock and Overstreet, 1999 from the southern flounder Paralichthys lethostigma on the east coast of the USA. Observation of adult female worms was used as an indication of the parasite’s presence in the fish. Adult females were found only in P. lethostigma >150 mm total length. The overall prevalence was 74%, with a mean intensity of 5 female nematodes per parasitized fish. Infected flounders were found throughout the year with a statistically significant decrease in intensity in the winter months. Neither salinity, water temperature, fish gender nor fish age were found to influence either prevalence or intensity of infection in the flounder. While larvigerous (gravid) females were found throughout the year, the significant decrease in their occurrence during the summer through fall, in concert with an observed decrease in intensity of infection during the winter, indicated that the life cycle of this philometrid species is likely to be annual.

KEY WORDS: Nematode · Philometridae · Population dynamics · Southern flounder

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