



» -J.*', * •..,•» 



Figure 6: — Photomicrograph of >yxosoma 

 cerebralis in cartilage at 3 months 

 post-infection (x 100). See fig. 7 

 for labelling. 



TROPHOZOITE, '^ 



\». •■ 



r> 



INTACT C^PTIL/lGE 



Figure 8: — Photomicrograph of %xosoma 

 cerebralis in cartilage at 3 months 

 post-infection (x U30). 



^ikbHVt" 



|.— BONE 



CART I LAGE 

 OEBR I S 



TROPHOZOITES 



INTACT 

 CARTILAGE 



CARTILAGE 

 CELL 



^ <^ (5^ C5) 



Figure 1: — Drawing of I^osoma cerebralis 

 in cartilage at 3 months post-infection. 

 (Made from same slide as fig. 6) Drawn 

 with aid of microprojection. 



,r'y. 



^^m 



CARTILAGE 



Figure 9= — Photomicrograph of normal 

 cartilage resorption in trout about 

 3 months of age. These "lesions" 

 grossly resemble Myxosoma cerebralis 

 infections . 



