c. USBPF-3 (Railroad Trestle at Haval Air Station ). No 

 Llmnorla occurred on any of the control panels, and only 2, of the 4? 

 • test panels vere attacked . One of these panels contained only one 

 tunnel and the other shoved 5 tuimels. The first occurred In 19'i-5 and 

 the second In 19^6. Thus the attack at this location rated only a Tsare 

 trace these years, with no trace in 19''-7. 



5. Pholadldae. Pholadldae ( Martesia and Hlata) did not occur 

 on any of the control panels at any of the locations, "but occurred 

 sporadically on the test panels at all three locations. At the Ferry 

 Slip at the Naval Air Station, they appeared in 7 of the kj test 

 panels. The attacks rated a trace In 19^* moderate in 19^5 > zero 

 In 19^6ji. and medium heavy in 19^7. At the Ferry Slip at Pensacola, 

 they occurred in k of the k7 test panels, the attacks rating slight 

 in 19^5 and only a trace in 19^7/ with no traces the other years. At 

 the Railroad Trestle at the Naval Air Station, they occurred in only 

 2 of the k-l test panels in 19^5^ the attack rating "but slight. 



A19.04 Fouling Agents 



1. Silt . Silt occurred on all the panels of Isoth the control 

 and test series at all locations except on 5 panels at the Ferry Slip 

 at the Naval Air Station. Only fragments of one of these panels 

 were left, and the outer surfaces of the other 2 were destroyed. At 

 the last-named location the deposits ranged from traces to light on 

 the test series. At the other two locations, they ranged generally 

 from traces to moderate on the panels of the control series, and from 

 light to moderate on those of the test series. 



2. Algae . Green algae occurred as traces or light growths on 

 2 control panels ajad on a single test panel at the Ferry Slip at 

 Pensacola, also on 2 each of the control ajod test panels at the Rail- 

 road Trestle at the Naval Air Station. 



3. Invertebrate animnl pbyla . 



a. For If era (sponges ). Sponges occurred on a single test 

 panel at the Ferry Slip at Pensacola and on 3 of the test panels at 

 the Railroad Trestle at the Naval Air Station. On the panel at the 

 first location, 6o^ of the surface was covered . 



"b. Coelenterata (hydroids and Metridium ). Hydroids 

 occurred with great frequency on the panels at all three locations. 

 They occurred on 20 of the kl control panels and 30 of the 47 test 

 panels at the Ferry Slip at the Naval Air Station, on 31 of the kl 

 control panels and 38 of the kj test panels at the Ferry Slip at 

 Pensacola, and on 28 of the kO control panels and kl of the kj test; 

 panels at the Railroad Trestle at the Naval Air Station. The growths 



92 



