CONTENTS 



Page 



Introduction 1 



Historical and Geographical 2 



Occurrence in the United States 2 



Symptoms and the course of the disease 3 



Transmission and host specificity 5 



Life cycle 5 



Development stages in trout 8 



Histopathology 10 



Diagnosis 11 



Control and treatment 12 



Summary 13 



Literature cited 13 



