Section 29 

 BEERTE, TUmSIA — U. S. AU7AHCED AMPHIBIOUS TRAINIMG BASE 



A29.01* Location of the Test Station eind Test Boaxd 



A teet "board of the panel type, designated by the symbol USKBT-1, 

 vas operated at the U. S. Advanced Amphibious Training Base at Blzerte, 

 Tunisia, from June 19 to Noveniber 20, l^hk. No information was given as to 

 its exact location. ' This test "board vas washed away during a storm in 

 Decemlier, and it was not found feasi'ble to Install a replacement, as 

 this Base had "been directed to "be decoimnissloned soon afterward. 



A29.02 Bydroffraphic Data 



The depth of water where the test Ijoard was installed was 52 ft 

 9 in. , the tidal range 12 in. , the current approximately one knot. The 

 teinrperature of the water was given as 75° F on July 21, 79° F on "both 

 August 21 and September 21, 69° F on Octolser 21, and 5^° F on November 

 25. The degree of pollution, as estimated "by gas formation, was 15?^ each 

 month from July to October, but in November there was no gas formation in 

 a 48-hour culture. 



A29.O5 Marine Borers 



1. Teredinidae . Teredinidae ( Teredo sp. was the only identifi- 

 cation) do not appear to have been very active at this location. In the 

 control panels, 9 embryonic specimens were recorded in the first panel 

 removed, h questionable pits in the second panel removed, and no specimens 

 in the other 5 panels. In the test panels, Teredinidae were recorded to 

 the extent of 2 specimens up to 65 mm long in the pauiel removed in October 

 after k months' exposure, and 8 specimens up to 50 mm long in the panel 

 removed in November after 5 months' exposure. On the basis of the brief 

 test made, the attack could not be rated as being more than slight. 



2. Limnoria . Limnoria were considerably more active and were 

 responsible for the major part of the destruction of the panels. They were 

 present on all control and test panels, and the infestation attained a 

 peak in the last of the test panels removed in November, after 5 months' 

 submergence, with from 20 to 50 tunnels per sq in. recorded in patches 

 covering almost one-half of the panel (about 1,980). This attack is 

 considered as rather low in the moderate rating. It is possible, however, 

 that an even greater Limnoria attack might have been recorded had the test 

 board been operated longer, as the population in the test panels more theui 

 doubled each month they were submerged, after the first month. 



A29.0k Fouling Agents 



1. Silt . Silt occurred on all the panels of both the control and 



151 



