Fishery Bulletin 100(1) 



to be estimated in the three-reader case. For example, if 

 = 0.8 for all three readers, one would have to 



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have almost twice (0.035/.019=1.84) the sample size to esti- 

 mate ap of about 0.5. Once accuracy estimates for the read- 



ers are obtained, dropping one or even two readers may be 

 appropriate, although the assumption must be made that 

 the accuracy rates will be constant for the remainder of 

 the program. Maintaining two readers will allow for that 



