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Diseases of Aquatic Organisms

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DAO 65:177-180 (2005)  -  doi:10.3354/dao065177

Hyperparasitism of trichodinid ciliates on monogenean gill flukes of two marine fish

A. Colorni*, A. Diamant

Israel Oceanographic and Limnological Research, National Center for Mariculture, PO Box 1212, Eilat 88112, Israel

ABSTRACT: Two unusual cases of hyperparasitism of trichodinid ciliates on monogenean gill flukes are described from southern Israel (Red Sea). The first case occurred in cultured European sea bass Dicentrarchus labrax infected by Diplectanum aequans, while the second was observed in a feral devil firefish Pterois miles infected by Haliotrema sp. In both cases, the trichodinids heavily co-infested the host fish gills. The flukes were completely coated by the ciliates, which gave them a cobblestone appearance, but no damage to their tegument was apparent. Both cases are most likely a result of accidental hyperparasitism, brought about by perturbed environmental conditions.

KEY WORDS: Diplectanum · Haliotrema · Hyperparasitism · Marine fish · Monogenea · Trichodina

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