2. Test Besiats . 



a. Borers. The attack "by Teredinldae at this location 

 rated yery heavy; the "breeding season appears to extend from the 

 middle of December to the middle of Novemher. All panels exposed for 

 five or more months were riddled, and several were at least half destroyed. 

 Limnoria . were active throughout the test, "but the maximum attack, even 

 after 8 months' suhmergence, did not exceed a low slight rating aind 

 rated only a trace most of the time. 



l>. Fouling Organisms . Silt and invertebrate animal s 

 belonging to it- phyla contributed to the fouling of the panels. The 

 phyla included hydroids, encrusting and filamentous Bryozoa, searpulid 

 worms, and barnacles. Silt occurred with great regularity on nearly 

 all the panels. Hydroids and encrusting Bryozoa ocCttrred with great 

 regularity during the first half of the test, but hydroids failed to 

 occur subsequently, and encrusting Bryozoa did not appear again until 

 at the end of the test. Barnacles were present in great abundance on 

 a series of test panels submerged at monthly intervals during a period 

 of 6 months, but failed to occur on test panels at any other time. 

 The occ:irrence of filataentous Bryozoa and serpulid worms was only occasional. 



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