FISHERY BULLETIN: VOL. 78. NO. .! 



Table 4. — Variances of means of catch (per 1.8 km towed) from hypothetical populations of rockfish that 

 were constructed from 1977 survey data. Calculations are made under random, stratified random, and system- 

 atic sampling schemes. Hypothetical populations are composed of either four or five systematic samples 

 with two members. 



observations. It was also noted that our present 

 state of knowledge precludes more optimally de- 

 signed stratified random schemes on the scale 

 considered. It appears that the decision to space 



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transects of the 1977 survey in a systematic 

 fashion was correct. While the data do indicate 

 that systematic sampling is more precise than 

 stratified random, the differences are slight and 



