Justine Jean-Lou auteur aut IRD Leblanc P. auteur aut IRD Keller F. auteur aut IRD Lester R.J.G. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Turbellarian black spot disease is described in a bluespine unicornfish Naso unicornis (Perciformes, Acanthuridae) collected from the wild off Noumea, New Caledonia, South Pacific. Each cyst contained a whitish worm, 2 to 4 mm in length, which was able to swim freely in seawater. Cyst walls consisted of fibrous tissue with a scattering of melanocytes. Worms had 2 eyespots at the anterior end, a pharynx at the posterior end and a largely undeveloped reproductive system. They were identified as Piscinquilinus sp, (= Ichthyophaga sp.), a genostomatid turbellarian. The disease spread within 2 wk from a single infected fish to 3 other unicornfish in the same tank, in spite of copper sulphate and diluted seawater treatment; however, other fish from several families kept in the same tank were not infected, suggesting specificity of these parasites. Praziquantel injections into the infected fish eliminated the infection. Other cases of turbellarian infections are reported from 7 fish species off New Caledonia; prevalence is very low (0.3%). specialized POISSON MARIN PARASITOSE INVERTEBRE AQUATIQUE DESCRIPTION NOUVELLE CALEDONIE Black spot disease Fish Naso unicornis Turbellaria New Caledonia Piscinquilinus Ichthyophaga 080ZOOGEN04 034BIOVER01 85 3 245-249 2009 0177-5103 https://www.documentation.ird.fr/hor/PAR00004053 0177-5103 [F B010080093] https://www.documentation.ird.fr/hor/PAR00004053 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-01/010080093.pdf IRD - Base Horizon / Pleins textes 2009-10-07 2021-02-10 PAR00004053 fre