AlH.Oi!- Fouling Agents 



1. Silt . Silt occurred as traces to light deposits on all 

 except 5 of the kO control" panpls and as light to moderate deposits on 

 all of the 59 ■test panels. 



2. Algae . Traces of green algae occurred on a single panel of 

 "both the control and test series. 



i 



5. Invertebrate animal phyla . 



a. Coelenterata (hydroids ). Hydroids occurred as traces 

 on 25 of the 40 panels and as traces to light growths on 57 of the 59 

 test panels. Tuhularia was identified repeatedly.. 



h. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred sparingly on a single control panel and on k of the 59 test 

 panels. Cryptosula sp. was the only one identified. Filamentous 

 Bryozoa occurred more or less abundantly on 7 of the kO control panels 

 and on 25 of the 59 test panels. Bugula flahellata and Bugula sp. were 

 the only identifications. 



c. Arthropoda (crustaceans ). Balanus ("barnacles) occurred 

 in imusual abundance on 27 of the lt-0 control panels and on all of the 

 59 test panels. ELeyen of the control panels were 25^ to 100^ 

 covered, and Jik of the test panels were 20^ to 100^ covered. Maximum 

 diameters of 9 mm were recorded on a control panel and 15 mm on a test 

 panel after 8 months' submergence. Corophium occurred abundantly on a 

 single test panel. 



d. Mollusca (nonboring molltisks ). Mytilus (mussels) 

 occurred on a single control panel and on 19 of the 59 test panels. 

 They ranged in numbers from a few to kO or 50. A maximum diameter of 

 17 mti was recorded on a control panel and 51 nm on a test panel 



after 8 months' submergence. A solitary specimen of Anomla (jlngle-shells), 

 12 mm in diameter, occurred on a single test panel. 



e. Chordata (tunica tea ). Tr&oeB of tunica tes ( Botryllue 

 Bohlosseri ) occurred on a single control panel and on 2 of the test 

 panels. 



Al|.1.05 Surnmary and Conclusions^ 



1* Ihetallatlon . a test board of the panel type Installed at 

 the U. S. Haval ItrydookB at Hunter's Point, San Francisco, California, 

 on August 12, 19kk, Is still being operated. The results of this test 

 have been summarized to the end of 19^7 • 



181^ 



