| import of exotic and zoonotic trematodes (heterophyidae: centrocestus sp.) in xiphophorus maculatus: implications for ornamental fish import control in europe. | ornamental fish, xiphophorus maculatus, were imported from singapore to denmark for distribution to local aquarists. importers observed lethargic and erratic swimming patterns among fish and forwarded a total of 30 fish for pathological examination to a university diagnostic service. all fish were diagnosed infected with encysted centrocestus sp. metacercariae in gills (prevalence of 100% and mean intensity of 454.5 ± 161.9 parasites per fish). metacercariae were identified by morphological and ... | 2014 | 24827099 |