All float in a saturated salt solution except -
Clonorchis sinensis
Feilised eggs of ascarsis
Larva of strongyloids
Trichuris trichura
The eggs of clonorchis may be demonstrated in feces or aspirated bile. They do not float in concentrated saline. REF:TEXTBOOK OF MEDICAL PARASITOLOGY;CKJ PANIKER;6TH EDITION;PAGE NO127
parasitology