Table 3 (Continued) 



Table k shows length frequencies of clams removed from 500 square 

 feet of bottom by bullraking and dredging 19l;9 and 1950o These frequen- 

 cies were computed hy the following procedure and are shown as the 

 difference between dotted and solid lines in Figures 8, 9, 10 and llj 



1, Determine percentage of catch at each length from length 

 measurements of clams removed from each quarter of each 

 area by experimental fishery „ 



2o From fishing records determine total bushels removed from 

 each quarter of each area by each fishing method. 



3o By proportion compute bushels which were removed from an 

 area equal to that which was later sampled by clamshell 

 bucket o 



Bushels removed from 



quarter by fishery 

 Total area of quarter 



Bushels removed from area 



sam-pled by bucket 

 Area in quarter sampled 

 by bucket 



I4,. Multiply bushels removed from sampled area in each quarter 

 (as determined in Step 3) by percentage of clams at each 

 length (as determined in Step 1) to determine bushels of 

 clams of each length removed by fishery from an ar^ equal 

 to that sampled in each quarter. 



29 



