Filamentous Bryozoa occurred on 5 control peuaelB and on 10 test panels, 

 Bugula fla"bellata and Bugula sp. were the only farms Identified. 



c. Annelida (annelid vorms ). Serpulid ( Serpula ) tubes were 

 not present on any of the control panels tut occurred on 5 test panels. 



d. Arthropoda (crustaceans ) . Balenus (barnacles) were 

 not present on any of the control panels hut occurred In sTnall numbers 

 on & test peinels, the maiimum diameter recorded being k mm after 8 

 months' submergence. A few amphipods occurred on one panel each of 

 both the control and test panels. 



e. Mollusca (nonboring molluslm ). Miscellaneous nonboring 

 mollusks occurred occasionally as follows: Anemia (jingle -shells) 

 occurred on one control panel and on 6 of the 21 test panels. The 

 largest number on any one panel was 30, and the piqYi™'™ size recorded was 

 15 mm on a panel, submerged for 8 months. Hytilus (mussels) were not 

 present on the control panels, but occurred on 7 of the 21 test panels. The 

 mayimnTTi number on any panel was 60 , and the maximum length recorded was 



ll4- mm on a panel submerged for 8 months. Traces of Pecten (scallops) 

 and Saxicava occurred on single test panels. 



A5'4-.05 Summary and Conclusions 



1. Installation . A test board of the panel type was operated 

 at the U. S. Naval Air Station at Sitka, Alaska, from November 15, I9UU 

 until its discontinuance on August I6, 1946, to deteimine the identity 

 and prevalence of marine borers and fouling agents at this location. 



2. Test Besults . 



a. Borers . Teredinldae were more or less active at this 

 location, the attack rating very heavy in 19^5 and medium heavy in 

 19^6. The breeding season is difficult to determine because of the 

 extremely limited occurrence of Teredinldae in the control panels and the 

 short duration of the test, but it appears to extend from February to at 

 least the middle of July. LiTtinorla were active at this location through- 

 out the period of the test, and the attacks attained peak ratings of 

 very heavy by the summer of 19^5 aJ^d again early in 19^6 . 



b. Fouling Organlams. . Silt, algae, emd invertebrate 

 animals belonging to 5 piiyla contributed to fouling of the panels. 

 The latter Included hydroids, encrusting and filamentous Bryozoa, ser- 

 pulid worms, barnacles and amphipods, and nonboring moUusks. Of these 

 organisms, hydroids and encrusting Bryozoa occurred with the greatest 

 frequency; filamentous Bryozoa occurred with less frequency; while the 

 occurrence of the others, as well as of the algae, was merely sporadic 

 or occasional. 



l^k 



