446 
Fishery Bulletin 96(3), 1 998 
the importance of avoiding a competitive atmosphere 
in which bagging the most abalone becomes the ob- 
jective are essential characteristics of an effective 
abalone survey team. The problem of competition 
implies that nondestructive sampling, such as count- 
ing, may reduce potential bias associated with col- 
A Radial transects B Timed searches 
Simulated year 
Figure 5 
Predicted probabilities for detecting cumulative annual changes in H. rubra abundance from (A) radial transect surveys and (B) 
timed searches. 
