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FISHERY BULLETIN: VOL. 71, NO. 3 



Si / .§2 in Examples 1 and 3. The latter com- 

 parison and estimates are summarized below: 



Example 



1 



2 

 3 



Noting finally that absolute bias (estimate 

 minus parameter value) is not excessive for any 

 estimate or example in Appendix Table 1, the 

 foregoing analysis leads us to believe that esti- 

 mates in text Table 7 of the text are quite close 

 to reality for 1965-66 brood coho salmon from 

 Columbia River hatcheries (data from all river 

 sections combined). 



Procedure for Calculating Estimates 



The estimating scheme is described elsewhere 

 (Lander, 1973). That account may not be avail- 

 able to the reader; furthermore, it discusses 

 also the situations where offshore catch is not 

 known and an offshore fishery does not occur, 

 and therefore is not a compact summary. Ap- 

 pendix Table 2 briefly reviews the assumptions 

 and calculating methods for the case where off- 

 shore catch is known by origin. 



694 



