of the 50 control paaiele and on. 17 of the 50 test panels. At the Naval 

 Station, they occurred on 11 of the 58 control panels and on 28 of the 

 k3 test panels. At the Fuel Facility, a maximum diameter ot 9 mat. vas 

 recorded on the control panels and 29 mm on a test panel after 13 months' 

 suhmergence. At the Naval Station, a maximum diameter of 11 mm was 

 recorded on a control panel and 20 mm on a test panel after 8 months' 

 suhmergence . One of the control panels at each location vas 25^ covered, 

 and h of the test panels at each location vere from 25^ to 35^ covered. 

 Corophlum occurred on a single control panel at the Fuel Facility and on 



one control and one test panel at the Naval Station, The largest number 



recorded on ajiy one oejiel was 12^ specimens. 



d. Mollusoa (nonhoring mollusks ) . Mlscellajieous nonhoring 

 mollusks occurred occasionally as follows: A trace of Mytilus (mussels) 

 occurred on 2 of the test panels at the Naval Station. One panel 

 suhmerged for 8 months contained specimens up to 25 mm in length. A 

 trace of Pec ten (scallops) occurred on a single control panel and on li- 

 test panels at the Fuel Facility. One panel suhmerged k months had- 

 specimens up to 5 mi in diameter. A few specimens of Saxicava occurred 

 on 2 test panels at the Fuel Facility. No sizes were recorded, 



e. Chord ata ( tunl cate s ) . Tunicates occurred more or less 

 abimdantly on 7 of the 30' control panels and on 9 of the 30 test panels 



at the Fuel Facility; >*ille at the Naval Station, they occurred on 5 ot the 

 38 control panels and on 19 of the k^ test panels. One of the test panels 

 at the latter location was 85^ covered. Botryllus schlosseri and Clooa 

 were identified. 



a1»-5 05 Summary and Conclusions 



1., Installation . Test hoards of the panel type Installed at 

 the U. S. Naval Supply Depot Facility and the U. S. Neval Station at 

 San Diego, California, on July 17 and August 3, 19^, to determine the 

 Identity and prevalence of marine horers and fouling organisms, are 

 still heing operated. The results of the test have heen summarized to 

 the end of I9U7. 



f 



2. Test Besults . 



a. Borers « Teredlnldae were very active at the Fuel Facility 

 throughout the periods covered hy the tests hut showed relatively little 

 activity at the Naval Station. At the Fuel Facility, the breeding season 

 was continuous, and the attack rated very heavy In 19^5, 19^+6, and 19^7. 

 At the Naval Station, ttie breeding season extended only from March to the 

 middle of August in 19^5^ with only 3 minute pits recorded subsequently. 

 The attack rated none or a trace most of the tlifle but attained peak ratings 



210 



