Section 51 

 ADAK, ALASKA. — U. S. NAVAL OPERATIC BASE 



A5I.OI Location of the Test Station and Test Board 



A test "board of the panel type, designated USMA-1, was installed 

 July 15, 19hk, at the U. S. Naval Operating Base at Adak, Alaska. No 

 other details of the location of this test "board are aTallatle, except that 

 it was suspended from, the center of Pier Wo. 9, located in Sweeper Cove in 

 SAluk Bay on the northeastern side of the Island. 



The test "board was lost in November 19*4^ and a new one was installed 

 on January 11, 19^5* After the panels for September 19^7 were removed and 

 sent to the Laboratory, the test "board was lost a^in, and a new one was 

 installed on Decem"ber 15, 19^7, at the outboard end of Dock No. 9« The 

 operation of this test "board is Tieing continued. The test results have 

 "been summarized to the end of 19^7* 



A51.O2 Hydrographlc Data 



The depth of water where this test "board was installed was kO ft; 

 the tidal range was k ft; the current was negllgi"ble. The average 

 temperature of the water was given as 2° C (56° E). The salinity of the 

 water was not determined. "Very little pollution "by oil and sewage was 

 ohserved. 



Where the new test "board was installed on December 15, 19^7, the 

 depth of water was given as 70 ft at mean low water. No pollution was 

 o'bserved. 



A51.05 Marine Borers 



1. Teredinidae . Teredlnidae occurred to a very limited extent at 

 this location in 19^6 and 19^7, and no "borers were recorded on either the 

 control or test panels in 19^^ or 19^5. On the control panels, only 10 

 minute pits were recorded in the panel suhmerged from Iferch 15 to April 

 15, 19^6, and a q.uestiona"ble pit was recorded in the panel su"hmerged from 

 May 16 to June 1^, 19^7- In the test panels, Teredinidae were recorded in 

 only 6 of the 57, and were limited almost 'entirely to 19^6, occurring in 

 only one panel in 19^7. These "borers ranged from minute pits to specimens up 

 to 80 ram In length in one pajiel removed on April 15, 19^6, after 7 months* 

 Bu'bmergence. In those panels where well -developed specimens occurred, the 

 maximum num"ber recorded was 19. The "breeding season at this location 

 appears to extend from March 15 to July 15. Bankia setacea was the only 

 species identified. The attack rated slight In 19^6 and only a trace 



in 19hT, 



2. Limaoria . Limnoria were more or less active in 19^6 and 19^7, 

 "but no specimens occurred in 19Ml- or 19^5 except for 5 tunnels recorded 

 on a single control panel in 19^5 • They occurred In only 12 of the 55 



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