e. Army Pier . Limnorla failed to develop in any of the 

 16 control panels, tut occurred in all except 3 of the same number of 

 test panels. The attack never rated more than a traxje in 19^5. 



A53.Ql». Fouling Agents 



1. Silt . Silt occurred on all the panels at all five locations 

 except on one control panel at the Permanent Pier, and on one test and 

 one control panel at the Marine Eailway. The deposits ranged from traces 

 to light on the control panels and from traces to moderate on the test 

 panels at the first four locations, hut at the Army Pier they rated as 

 mere traces on the control panels and from traces to light on the test 

 panels. 



2. Algae . Algae occurred frequently on the panels at the Woody 

 Island Pier, but only rarely on the panels at the other four locations. 

 They occurred on a single test panel at the Temporary Pier, on k control 

 panels and one test panel at the Permanent Pier, on 2 control panels and 

 one test panel at the Marine Eailway, on 12 of the 57 control panels and 

 27 of the same number of test panels at the Woody Island Pier, and on k 

 control panels and 3 test panels at the Army Pier. At the four locations 

 where they occurred so infrequently, there were mere traces on the panels 

 in practically all cases. However, at the Woody Island Pier, where they 

 occurred quite frequently, the growths rated as traces to rarely light or 

 medium on the control panels and from traces to heavy on the test panels. 

 The algae were mostly green, "but red and hrown algae also occurred at the 

 Woody Island Pier. 



3. Invertebrate animal phyla . 



a. Coelenterata (hydrolds and Metrldium ) . Hydroids occurred 

 with great frequency on the panels at all five locations. They were 

 present on 7 of the 30 control panels and 28 of the 30 test panels at 

 the Temporary Pier, on 9 of the 59 control panels and 55 of the 59 test 

 panels at the Permanent Pier, on 10 of the 28 control panels and 26 of 

 the 58 test panels at the Marine Railway, on 11 of the 57 control panels 

 and 33 of the same number of test panels at the Woody Island Pier, and 

 on 5 of the I6 control panels and ik of the same number of test panels 

 at the Army Pier. In most cases the growths were merely traces, hut 

 they rated up to light occasionally on the test panels at the Permanent 

 Pier and Marine Railway and up to moderate on the test panels at the 

 Woody Island Pier. Tuhularla was identified at the latter location. 

 A trace of Metrldium. - a memher of a different group of Coelenterata , 

 waa recorded on 2 test panels at the Permanent Pier. 



h. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred quite frequently on the panels at all five locations. They 

 occurred on 2 of the 30 control panels and 21 of the 50 test panels at 

 the Temporary Pier, on 2 of the 59 control panels and 50 of the same 



lJ+8 



