c. Arthropoda (crustaceans) . Balanus (barnacles) occiirred, 

 vlth great frequency and In great abundance on the panels at all three 

 locations. At the Barge Pier, they were on 11 of .the 51 control panels 

 and on 25 of the 26 test pajiels. Fifteen of these control panels were 

 15^ to 100?^ covered, and 21 of the teat panels were 50^ to 100^ covered. 

 A maximum size of 7 mm was recorded on a control panel eind 12 mm on a 



test panel after 6 months* submergence. At Wharf No. 2, barnacles occurred 

 on 20 of the 55 control panels and on 29 of the 55 test panels. Fourteen of 

 the control panels were 25^ to 100^ covered, and 28 of the test panels, were 

 50^ to 100^ covered, A maximum diameter of 8 mm was recorded on a control 

 panel and I5 mm on a test panel after 9 months' submergence. At Wharf 

 No. 5, barnacles occurred on 16 of the 55 control panels and on 28 of the 

 55 test panels. Twelve of the control panels were Uo^ to lOOfi covered, 

 and 25 of the test panels were 60^ to 100^ covered. A majclmum diameter 

 of 9- mm was recorded on a control panel and I5 mm on a test panel sifter 

 9 months' submergence. Traces of amphlpods occurred on a single control 

 panel at both the Barge Pier and Wharf No. 2 and on 5 of the control 

 panels and 2 of the test panels at Wliarf No. 5. Isopods occurred on 

 single peuiels of both the control and test series at the Barge Pier, 

 on 2 panels each of the control and test series at Wharf No. 2, and 

 on 2 control panels and h test panels at Wharf No. 5, Ihe largest number 

 on any one panel was 50 isopods. 



d. MolluBca (nonborlng mollusks ). Mytllus (mussels) 

 occurred on 10 of the 26 test panels at the Barge Pier, on 7 of the 55 

 test panels at Wharf No. 2, and on 8 of the 55 test panels at Wharf 



No. 5. The largest number on any panel was 55 mussels. Maximum lengths 

 of 25 mm were recorded at each location after 7, 8, and 9 mon1;hs'- 

 submergence, respectively. 



AI12.O5 Summary and Conclusions 



1. Installatio ns . Three test boards of the panel type installed 

 at different locations at the U. S. Naval Magazine at Port Chicago, 

 California on January 5, 19^5^ "to determine the identity and prevalence 

 of marine borers and fouling organisms, are still being operated. The 

 results of these tests have been summarized to the end of 19^7. 



2. Test Results . 



a. Borers . Teredinidae showed relatively little activity at 

 all three locations. Ihe low salinity of the water, which appears to have 

 been merely brackish during the spring months, was unfavorable for their 

 development. Tlie breaking season at these locations appears to be extremely 

 short, apparently lasting only from August to early October at the Barge 

 Pier and Wheirf No. 2 and from September to early October at Wharf No. 5. 



191 



