A10.03 Marine Borers 



1. Teredlnldae . No evidence of Teredlnldae was recorded on 

 any panel in either the control or test series at this location. 



2. Llmnoria . The only evidence of Limnoria consisted of 5 

 tunnels recorded on a single test panel removed Octoher 3, IP^+S^ 

 after having heen submerged for 8 months. Thus the Limnoria attack at 

 this location rated the barest trace. 



AlO.OU Fouling Agenta 



1. Silt . Silt occurred on every one of the series of kl 

 control and test panels (one of the latter not received) . In "both 

 types of panels the deposits ranged from traces to moderate, and 

 vere oily on several panels. 



2. Invertebrate animal phyla . 



a. Coelenterata (hydroids ). Hydroids occurred as traces 

 on 6 of hi control panels and as traces to light growths on 21 of 

 the same number of ' test panels. 



b. Arthropoda (crustaceans ). Balanua (barnacles) occurred 

 on 2 of the kl control panels, and on 22 of the same number of test 

 panels. The number on any one panel was nearly always small, but a 

 total of 250 was recorded on one of the test panels. The maximum 

 diameter attained on the control panels was 6 mm; while that on the 

 test panels was 10 ram. 



AIO.O5 SuTtrmary and Conclusions 



1, Installation . A test board of the panel type installed 

 July 20, 19^1^, at the New York Naval Shipyard, Naval Base Section, 

 at Brooklyn, New York, is still being operated.- The results of this 

 test have been summarized to the end of 19^7. 



2. Test Results . 



a. Borers . No evidence of Teredlnldae was recorded at 

 this location, and the only evidence of Limnoria consisted of 5 

 tunnels on a single test panel, so that the attack by the latter 

 rated only the barest trace. 



b. Fouling Organisms . Silt and invertebrate animals 

 belonging to 2 phyla contributed to fouling of the panels. The 

 latter comprised hydroids and barnacles, both of which occurred which 

 equal frequency but lightly. The heavy pollution at this location 

 appears to be unfavorable for the development of either marine borers 

 or of great numbers of fouling organisms. 



^h 



