DAO 39:65-73 (1999)  -  doi:10.3354/dao039065

Massive infestation by Amyloodinium ocellatum (Dinoflagellida) of fish in a highly saline lake, Salton Sea, California, USA

Boris I. Kuperman*, Victoria E. Matey

Department of Biology and Center for Inland Waters, San Diego State University, San Diego, California 92182-4614, USA

ABSTRACT: Persistent fish infestation by the parasitic dinoflagellate Amyloodinium ocellatum was found at a highly saline lake, Salton Sea, California, USA. The seasonal dynamics of the infestation of young tilapia was traced in 1997-1998. First appearing in May, it became maximal in June-August, decreased in October and was not detectable in November. Outbreak of the infestation and subsequent mortality of young fish was registered at the Sea at a water temperature and salinity of 40°C and 46 ppt, respectively. Some aspects of the ultrastructure of parasitic trophonts of A. ocellatum and their location on the fish from different size groups are considered. The interactions of parasitological and environmental factors and their combined effect upon fish from the Salton Sea are discussed.

KEY WORDS: Parasite · Dinoflagellate · Amyloodinium ocellatum · Tilapia · Infestation · Salton Sea

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