| perkinsus olseni detected in vietnamese aquacultured reef clams tridacna crocea imported to the usa, following a mortality event. | morbidity and mortality were observed in a group of 30 reef clams tridacna crocea that were imported to florida, usa, from a vietnamese culture facility and held in research facility aquaria. clinical signs included an incompletely extended mantle, slow mantle responses to stimuli, and sloughing of byssal tissue beginning 2 to 5 d prior to death. necropsy findings included emaciation, visceral mass edema, and rare multifocal 1 mm off-white to light-tan gill nodules. histopathology revealed marke ... | 2008 | 18589999 |