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All the membrane filters were intact; 

 seawater was retained inside the cylin- 

 drical test chamber; microorganisms 

 were isolated from these chambers 

 containing steel and aluminum alloy 

 test panels. 



Steel — Several calcareous tubeworms 

 (up to 1 inch long) were found on the 

 panels; other types of fouling organisms 

 were absent. Aluminum alloy — A few 

 tubeworms were attached to the surface 

 of the panels. 



Steel — Fouling growths (mostly erect 

 bryozoa) and about 50 small mussels 

 (1/8 inch) were attached to the surface 

 layer of corrosion product. Aluminum 

 alloy — Erect bryozoans and numerous 

 small mussels were attached directly 

 onto the metal surface. 



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Placed inside 

 test chambers 

 sealed with 

 membrane filters 

 (control panels) 



Placed inside 

 test chambers 

 covered with 

 nylon screen cloth 



Placed inside 

 test chamber 

 with ends 

 uncovered 



Test panels 

 placed on 

 plastic strips 

 (exposed panels) 



34 



