VI. CONCLUSIONS 



The presentation of the 1956-57 data (Maloney, 1958) established 

 the basic procedures for subsequent research and reporting. First 

 and second year data were relatively consistent for identical sites. 



In the approaches to Chesapeake Bay (Fig 1) 12-month accumulations 

 of foulers ranged from 31 to 38 ounces per square foot on curved steel 

 test panels. The predominant macroscopic sessile organisms were 

 barnacles, bryozoans, hydroids, calcareous tubeworms, tunicates, 

 mussels, jingle shells, oysters, and amphipod tubes. As indicated 

 above, this study has been limited to an analysis of the occurrence 

 of readily visible organism. Organisms of less importance and abundance 

 than those mentioned above were listedby Maloney (1958); consequently, 

 they are not included here. 



Figure 18 is a revised and expanded presentation similar to Figure 

 14 of H. O. TR-47 in which organisms occurring on 1-, 2-, 3-, 4-, 5-, 

 and 6-month panels are recorded. The same organisms and several 

 additional ones are shown for the 2-year data from Sites 1 and 2. 

 This presentation is useful for showing initial set, duration of set, 

 and end of set period; for showing the cumulative effect of multiple 

 months of exposure; for indicating the need for conditioning the attach- 

 ment surface in some panels before set can take place; and for showing 

 the succession of the various organisms. 



Periods of attachment, maximum attachment, and most rapid 

 growth of the principal foulers of Sites 1 and 2 are shown on Figures 

 19 and 20. In Figures 21 and 22 these are interpreted in terms of 

 periods satisfactory for the submergence of equipment, provided light 

 fouling is not objectionable. The data presented here are for surfaces 

 untreated or covered with regular paint; however, they may be used to 

 predict relatively safe periods when antifouling compounds of a known 

 expected effectiveness are used. If the time of introduction or immer- 

 sion is carefully planned, it is possible to extend the troublefree time 

 as much as 6 months beyond the expected effectiveness of the anti- 

 fouling compound. 



Maloney (1958) presented a series of fouling panel photographs which 

 demonstrate the fouling progression and succession of species for 

 Site 1. These photographs, while not representative of the entire 

 study area, are sufficiently indicative of the succession pattern to 

 obviate additional presentation. Maloney (1958) also presented the 

 possibility of using calcareous tubeworms or jingle shells as immersion 

 time indicator species; however, analysis of the 1956-59 data did not 

 provide sufficient information to establish these or other species as 

 indicators. 



39 



