Figures Cont ' d ; 



No. Page 



9. Size distribution of clams in ^00 square feet of bottom from 

 dredged area before and after 19^0 fishings Difference between 

 dotted and solid lines shows removal ty dredged fishery. Popula- 

 tion after fishing is based on 100 clamshell bucket samples taken 

 Oct. 19 and 20 3, 19U9. Data smoothed by moving average of 3's , <, „ 18 



10, Size distribution of clans in 500 square feet of bottom from 

 bullraked area before and after 19U9 fishing. Difference 

 between dotted and solid lines shows removal by bullrake fish- 

 ery. Population after fishing is based on 28 clamshell bucket 

 samples taken Dec. 15, 19U9, increased to 100 for comparison 



with Figure 11., Data smoothed by moving average of 3's . ... . 19 



11. Size distribution of clairis in 500 square feet of bottom from 

 bullraked area before and after 19^0 fishing- Difference 

 between dotted and solid lines shows removal by bullrake fish- 

 ery. Population after fishing is based on 100 clamshell 

 bucket samples taken Sept. 6-I3, 1950. Data smoothed by mov- 

 ing average of 3's » . o,,.. .......... . 20 



12, Size distribution of clams in 500 square feet of bottom from 

 control area Nov. 1, 19U9. Based on 28 clamshell bucket 

 samples increased to 100 for comparison with Figure 13. Data 

 smoothed by moving average of 3 's ............... . 22 



13. Size distribution of clams in 500 square feet of bottom from 

 control area Oct. 20, Nov. 1 and 8, 19^0. Based on 100 clam- 

 shell bucket samples. Data smoothed by moving average of 3's ... 23 



lb. Variance plotted against arithmetic mean for nine sampling 

 series listed in Table 6. Slope trend line fitted by least 

 squares method indicates need for transformation to make 

 analysis of variance applicable ................. 3> 



15. Variance plotted against ariLlimetic mean for nine sampling series 

 listed in Table 6 after numbers of cla ms per sample vjere gro uped 

 in classes of two and transformed by /class midpoint + 3/8» 

 Extremely slight slope of trend line indicates this transforma- 

 tion has made variance independent of the mean ,...,,.... 37 



16, Number of clams per clamshell bucket sample after shov/ing skewed 

 distribution. Data for all areas and all samples, 19U9 and 



1950 grouped in classes of two ................. 38 



17, Number of clams per clamshell bucket sample after applying 

 square root transformation as shoiivn in Table 6. Data for all 



areas and all samples, 19U9 and 19^0 grouped in classes to two , . 39 



18. Length frequencies of clams taken in two ser-'es of $0 clam- 

 shell bucket samples each in control area Oct. 20 and Nov. 1, 



19^0, and Nov. S", 19^0 ........,.........'... U2 



