IV. FOULING WEIGHT AND COVERAGE 



The fouling weight on each panel was determined as wet weight 

 in air. Quantitative determinations were patterned after Maloney 

 (1958) in set and growth relations. Figure 9 presents fouling weights 

 for 1-, 2-, and 3-month periods for Site 1 from April-May 1956 

 through April-May 1958. This figure, resulting from the compilation 

 of data for 2 years, is in basic agreement with the 1956-57 data for 

 the same site. Maximum set and most rapid growth are exhibited by the 

 2-month August-October and 3-month July-October panels; minimum 

 set and growth occurred on 1 -month panels from October-November 

 through April-May; however, there is no cessation of growth. Figure 

 11 shows that the growth curve for Site 1 continues to increase during 

 October-November through April-May. 



20 



M 



2| 



% 5 























1 1 1 





PANELS 

 — •— 1 MONTH 



. (-— -2 MONTHS 



~o--3 MONTHS 











.+" 



^ 



-°x 









— 







s 



s' 



„+-* 



.-- 



-Ni 



> 



> 



V 











*; 



<* 





.-*•' 

 S 



••- 



-•% 



**•- 



> 





«J* 





:v 



^ . 







APR. MAY JUN. JUL. AUG. SEP. OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUN. 



FIGURE 9 SITE 1, TOTAL FOULING COMPLEX WEIGHTS FOR 1-, 

 2-, AND 3-MONTH PANELS 1956-58. 



Site 2 data for 1-, 2-, and 3-month periods are presented in 

 Figure 10. The set-growth trend compares favorably with Site 1 except 

 that the monthly fouling rates are somewhat greater and the maximum 

 1-month set and growth occurs a month later during August-September. 

 The peak growth in the 3-month period February-March through May- 

 June seems to be rather heavy, even in view of the expected spring 

 bloom. As at Site 1, there is continued growth throughout the winter. 



The month-to-month differences in cumulative and monthly set and 

 growth are greater for Site 1 than for Site 2, resulting in a growth 

 factor of greater magnitude (Fig 11). 



11 



