FISHERY BULLETIN: VOL. 71, NO. 4 



liIniilnHlMiiliiHiniiiiiiiliHllniiliiiHiMiiiiiiiiHilHiiiiniliH'liiiliA 



Figure 1. — Pacific saury with three adult female and two juvenile copepods, Pcnnellu sp. Oken. 



groups, and length groups within age. The 

 increasing incidence of infection was found to 

 be a function of age (Table 2) but not length. 

 A chi-square test was employed to test the null 

 hypothesis that the occurrence of infected II-, 

 III-, and IV-year-old-fish was the same in 

 potential harvest areas off Washington and 

 Oregon (0.05 level). This hypothesis was rejected 

 (0.025 level) for Il-year-olds and accepted for 

 III- and IV-year-olds. 



Cciligns unicarovi 



Incidence of infection by C. macarovi (Figure 

 3) showed both annual and geographic vari- 



ability (Table 1). The proportion of infected 

 saury in 1970 samples ranged between 6.3 and 

 17.7% (mean 12.8%) off Oregon and between 

 24.0 and 42.4% (mean 35.0% ) off Washington. 

 Infections were less common in 1971 samples, 

 2.8 to 7.3% (mean 5.5%) off Oregon and 7.8 to 

 17.9% (mean 12.9%) off Washington. These 

 percentages, however, are certainly minimum 

 estimates of the rate of infection of the sampled 

 population because some C. macarovi dropped 

 off captured fish. 



Both 1970 and 1971 Washington and Oregon 

 data were separately examined for changes in 

 infection rate with increasing host size and 

 age. No trends of change related to those factors 



Table 2. — Numbers and percent incidence of Pcnnella-infecled saury in different 

 host age groups in samples taken in September 1970 from off the Washington and 

 Oregon coasts. 



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