PA3U 



Epizootiology li 



jotics. 



Mortality pattern turin an epizootic 



Distribution 01 LnJ I i i-h in ha-. 



Symptomatology 



Factors possibly corr-li" ise . 12 



Source of the virus 12 



Food 12 



orne and aquatic organisms lil 



L- 



3nvironmental factors 1- 



Water temperatures 1- 



rime of year — 



Shock lU 



Host factors 11+ 



'— 



Size 1- 



Heredity lc 



J - . l~e.-.- -."_ ,'t 1- 



01 'actives It 



Methods and Materials 17 



Inoculum 17 



Source 17 



Preparation 17 



Houtes of inoculation lfl 



Stability of virus 19 



Fish . . . IS 



Source IS 



ers 19 



Environmental conditions 20 



Water temperature 22 



:.. motherapy 20 



Nutrition 20 



Crowding 20 



Results 21 



Characteristics of the virus 21 



Demonstration of causative agent 21 



Infectious nature 21 



Filter ability 21 



Effect of storage 21 



Effect of heat 23 



Effect of oH 23 



