Section 28 

 CASABLAIKJA, FRENCH MOROCCO — U. S. MTAL OPERATING BASE 



A28.01 Location of the Test Station and Test Board 



A teat "board of the panel type was operated at the U. S. BfaTal 

 Operating Base at Casatlanca, French Morocco, from July 8, 19Mj- to June 

 1, 19^5' This hoard was placed adjacent to the repair "berth and against 

 the edge of the stone dock at the most southeasterly end of the "Biassin 

 Delande" in Casa'blanca Earhor. It was destroyed "by accident, and 

 another was Installed adjacent to the tug "berth at "the Li"berty Landing, 

 approximately 600 ft northwest of the first one and almost in the center 

 of the "Bassin iDelande. " This second test "board also was destroyed, and 

 a third "board was Installed March 1, 19^5* at the location formerly occupied 

 "by the second. The test "board at this location was designated "by the 

 sym"bol USMCB-1. The operation of this test "board was discontinued after 

 the removal of the panels on June 1, 19^5* apparently as a result of 

 decoramlssioniijg this Base, 



A28.02 Bydrogiraphio Data 



The first test "board, Installed July 8, 19^> "was placed in water 

 10 ft deep at mean low water where the tidal range was 8 ft and the current 

 was negligi"ble. The temperature of the water at the time of installation 

 was 65° F. There was reported to "be only slight pollution, "but it was 

 stated that oil slick may "be present occasioneilly. 



The second test "board, installed Novam"ber 22, 19^^*, was placed in 

 water 11 ft deeg at mean low water where the tidal range was 10 ft and 

 the current was negligi"ble. The temperature of the water at the time 

 of installation was 60° F. Water pollution here also was slight and 

 consisted chiefly of oil. The third test "board was installed at this 

 same location. 



A28.O5 Marine Borers 



1. Teredlnidae . Teredinidae t including Teredo ( Lyrodus ) sp. and 

 Teredo sp., were active at this location throughout the period covered "by 

 the test and caused the greatest amount of damage to th^ panels. They 

 occurred in all except one of the 8 control panels, "but all were embryonic 

 or minute specimens. A maxlmvcni of 175 was recorded in any of these panels. 

 Breeding continued throughout the period of the test, namely from July 

 to the end of May, and pro"bahly is continuous. Teredinidae occurred in 

 all of the 8 test panels, ranging from eoabryonic or minute specimens to 

 specimens up to 25 mm in length at the end of 5 months. As many as 66O 

 specimens were recorded in each of the last 2 panels, which were submerged 

 for 2 and 3 months, respectively. While these specimens did not attain any 

 great length, "because none of the test panels was suhmerged for more than 



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