e, Chordata (tunicates ). Tunicates were a^bsent on the control 

 panels and occxirred on only 3 of the test panels. Botryllus schlosseri was 

 the only form Identified. 



A2.05 Siimmary and Conclusions 



1. Installation . A test hoard of the panel type, installed at the 

 U. S.. Naval Operating Base at Argentia, Newfoimdland, on Jiily 1, 19^^ is 

 still being operated. The results of this test have been summarized to 

 the end of 19^7. 



2. Test_Results . 



a. Borers . Teredinidae were almost nonexistent at this 

 location, only 2 minute pits having been recorded, one of which was 

 questionable. Limnoria occurred with great regularity throughout the period 

 covered by the test except during the first 2 months, but they never 

 appeared in any large niunbers . Late in 19^5 an<i 19^° the maximum attacks 

 did not exceed moderate ratings, but the attacks rated only a trace diiring 

 practically all of 19^7. 



b. Fouling Organisms . Silt, green algae, and invertebrate- ani- 

 mals belonging to 5 phyla contributed to the fouling of the panels. 



The latter comprised hydroids, encrusting and filamentous Bryozoa, barnacles, 

 nonboring mollusks, and tunicates. Silt occurred on all except one of the 

 test panels. Hydroids also occurred on nearly all the test panels. 

 Encrusting Bryozoa occvirred at irregular periods on some of the test panels, 

 and the occurrence of barnacles, nonboring mollusks, and tunicates was 

 purely sporadic or occasional. The control panels were nearly all free 

 of marine organisms. In fact, with the exception of hydroids, there was 

 a very poor development of these organisms even on the test panels, the 

 reason for which is not apparent. 



3. Recent Addenda . There was no Teredinidae attack at this station 

 in either 19^8 or 19^9. In 1948 the L-lTnnoria attack rated a trace, while 

 in 19^9 it attained a rating of slight. 



24 



