HUGHES: PARASITES OF PACIFIC SAURY 



Table 3. — Pacific saury scarred from infections with the copepods Pennella sp. and Caligus 

 macarovi as sampled off the Pacific coast of North America during August-September 1970-71. 



groups — those fish with one to three scars, 

 those with more than three scars, and total 

 number of scarred fish. In 1970 when scarred 

 fish were more prevalent (77.7-100%), the per- 

 centage of fish with one to three scars decreased 

 with increasing age whereas those with more 

 than three scars increased. The fact that 1971 

 fish were less severely scarred than 1970 fish is 

 puzzling. 



Rhcid i tiorhy }i L hn s cololubis 



This acanthocephalan was associated primar- 

 ily with the lower digestive tract although 

 worms were also found attached in the mid- 

 stomach area (Figure 5). Tissue damage around 

 the point of attachment appeared minimal, and 

 the worm's proboscis rarely protruded through 

 the wall of the digestive tract. Female R. colo- 



8 



10 



n 



12 



Figure 5. — Lower digestive tract of a Pacific saury typically infected by the acanthocephalan, Rhadinorhynchus 



colulabis Laurs and McCauley. 



949 



