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The membrane filter seals were found 

 to be intact; microorganisms were 

 isolated from seawater retained inside 

 the test chambers containing steel and 

 aluminum alloy panels. 



When recovered, seawater was still 

 retained inside the test chamber which 

 was exposed for 43 days. The screen 

 was covered with marine growth, fine 

 sediment and debris. Several tube- 

 worms were found attached to steel 

 and aluminum alloy panels. Other 

 species of fouling organisms were 

 absent. A thick layer of fine sediment 

 was trapped inside the bottom section 

 of both cylinders. Sulfate-reducing 

 bacteria were found in the sediment. 



Steel — Fouling organisms such as 

 hydroids and bryozoans were attached 

 to red rust layer. Aluminum alloy — 

 Moderate amounts of fouling growth 

 such as hydroids and bryozoans were 

 found on the panels. 



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Placed inside 

 test chamber 

 sealed with 

 membrane filters 

 (control panels) 



Placed inside 

 test chamber 

 covered with 

 nylon screen 

 cloth 



Placed inside 

 test chamber 

 with ends 

 uncovered 



38 



