916 
Fishery Bulletin 96(4), 1998 
26 species from British Columbia waters and the 
GOA: of the 40 Corynosoma sp. recovered, 12 were 
from rougheye rockfish and 23 were from the GOA. 
Size did not appear significant in parasite 
prevalences except for N. robusta and C. pinguis in- 
fection in rougheye rockfish. Prevalences of several 
species of parasites, including N. robusta, differed 
significantly among fish of the same size. Nor was 
size a factor in parasite intensities, despite the ob- 
servation of Sekerak (1975) that intensities of cope- 
pods and monogenetic trematodes increase with in- 
creasing fish size, largely due to increased gill sur- 
face area. Although the value of parasite tags would 
be enhanced by sampling similar-size fish, the sta- 
tistically significant differences among areas, despite 
size variation, provide an indication of the potential 
power of parasite markers for these species. 
In summary, the prevalence or intensity of N. ro- 
busta, T. trituba, and Corynosoma sp. may prove to 
be useful markers for population studies of GOA 
shortraker and rougheye rockfishes. It is interest- 
ing to note the major reduction in prevalence of all 
three parasites among Southeast rougheye rockfish. 
Possibly these fish may constitute a separate stock 
and support a localized fishery. More studies are 
needed to evaluate the effects of temporal and spa- 
tial variability on parasite prevalence and intensity, 
particularly among GOA rougheye rockfishes. 
Acknowledgments 
The authors wish to thank the crew of the vessel FV 
Ocean Prowler and the scientific staff that collected 
the samples, especially Harold Zenger and Mike 
Sigler. Ryan Scott provided laboratory assistance in 
sorting parasites, and helpful reviews were provided 
by Dave Clausen and Mike Sigler. 
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