Journal
PARASITOLOGY INTERNATIONAL
Volume 62, Issue 6, Pages 586-589Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.parint.2013.06.011
Keywords
Algal parasite; Desmodesmus; Japanese sillago; Green alga; Fish disease
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A green spotted Japanese sillago (Sillago japonica) was caught by a fisherman and brought to the laboratory for pathological inspection. The green spots were abundant on the lateral line and more extensively so within the mouth cavity. In both sites, green spots were embedded within the fish flesh and formed 2-3 mm dome-shaped colonies. SEM revealed these colonies to harbor numerous unknown cells with small, surface warts (ornamentations). Molecular analysis showed the cells were Desmodesmus (D. komarekii), a common freshwater coccoid green alga found in ponds and rivers worldwide. It is uncertain how the host fish came to be infected with the alga which was not merely attached externally but embedded within the flesh and inside the mouth cavity. This is the first case of parasitic form of coccoid green algae in marine fish and provides new insights into the variable nature of green algae. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
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