A55.01*- Fouling Agents 



1. Silt , Silt occurred on all the panels of "both the control 

 and test series, the deposits ranging from traces to mostly light. 



2. Invertehrate «nitnw.i phyla . 



a. Coelenterata (hydrolda ). Bydrolds occurred on the last 

 k of the 7 control panels and on the first and the last k of the 7 

 test panels. They ranged from traces to light growths, Tubularia was 

 the only form Identified. 



h. Bryozoa (encrusting and f 11 nmentous ) . Encrusting Bryozoa 

 occurred on only one of the control panels and on 2 of the test panels. 

 Filamentous Bryozoa occurred on the first 2 of the control panels q;"<^ 

 on the first 5 of the test panels. 



c. Annelida (annelid worms ). A trace of serpulld ( Serpula ) 

 tuhes occurred on 2 of the 7 test panels. 



A55.05 Summary and Conclusions 



1. Installation . A test "board of the panel type was operated 

 at the U. S, Pacific Fleet Section Base at Okinawa, Southwestern 

 Islands of Japaji, during the brief period from February 6 to September 

 2, 19^6, to determine the Identity and prevalence of marine borers ^Tt^ 

 fouling organisms occurring at this location. 



2. Test Results . 



a. Borers . Teredlnldae developed with great rapidity, 

 and their tmmels soon filled the panels more or less completely; the 

 attack 2:«.ted very heavy. They appeared to begin to breed early in 

 April aiid rapidly from June through August, but a more extensive test 

 would probably show the breeding season to be continuous, Ll^nnf^rla 

 did not show suiy signs of development until August, and only a trace 

 was recorded during this month; but the loss of the test board and 

 discontinuance of the test made it impossible to follow their further 

 development. 



b. Fouling Organisms . Silt and inveartebrate animals 

 belonging to 5 phyla contributed to fouling of the panels. The 

 phyla comprised hydroids, encrusting and filamentous Bryozoa, and 



23h 



