DAO 66:171-173 (2005) - doi:10.3354/dao066171

First record of ostracods as natural intermediate hosts of Anguillicola crassus, a pathogenic swimbladder parasite of eels Anguilla spp.

Frantisek Moravec^1,*, Kazuya Nagasawa², Munenori Miyakawa³

¹Institute of Parasitology, Academy of Sciences of the Czech Republic, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic
²National Research Institute of Aquaculture, Nikko Branch, Fisheries Research Agency, Chugushi, Nikko, Tochigi 321-1661, Japan
³Aichi Fisheries Research Institute, 97 Wakamiya, Miya-ku, Gamagori, Aichi 413-0021, Japan

*Email: moravec@paru.cas.cz

ABSTRACT: The ostracod Physocypria nipponica (Ostracoda: Candonidae) was found (prevalence 14.2%) to be the only intermediate host of the nematode Anguillicola crassus (Nematoda: Anguillicolidae), a pathogenic swimbladder parasite of eels, in a greenhouse-heated culture pond at Isshiki, Aichi Prefecture, Japan. Japanese eels Anguilla japonica from the same pond were found to be infected by adult A. crassus (prevalence 71.8%, intensity 1 to 6). This indicates that A. crassus could complete its life cycle under conditions of modern eel-culture technology where copepods were absent due to the unfavorable water quality for them, by utilizing ostracods as the intermediate host.

KEY WORDS: Ostracoda · Physocypria nipponica · Intermediate host · Parasitic nematode · Anguillicola crassus · Japanese eel · Anguilla japonica · Japan

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DAO 66:171-173 (2005) - doi:10.3354/dao066171

First record of ostracods as natural intermediate hosts of Anguillicola crassus, a pathogenic swimbladder parasite of eels Anguilla spp.

Frantisek Moravec1,*, Kazuya Nagasawa2, Munenori Miyakawa3

Frantisek Moravec^1,*, Kazuya Nagasawa², Munenori Miyakawa³