Section 51 



MIWEPOK ATOLL, MARSHALL ISLAHES — 592D KA.VAL COHSTRTOTION BATTALION' 



MAUJTEHAMCE UHIT 



A51 . 01 Location of the Test Station and Teat Board 



A test Ijoard of the panel type vas operated "bj the 592d Nayal 

 Construction Battalion Maintenance Unit at Enlvetok Atoll, Marshall 

 Islands, frcm March 11 to August 11, 1946, vhen It was discontinued 

 as a result of the cessation of military actlTlty at this location. 

 This test hoard was designated hy the symbol USBAT-1. No Infoimatlon 

 was given with regard to Its exact location. 



A51,02 Bjdrographlc Data 



The depth of water at the location where the test "board was 

 installed was 20 ft; the tidal range was k ft; the velocity of the 

 current was ahout 2 knots. The teiQ>eratxire of t^e water at the time of 

 Installation was 82° F. The water was relatively free from pollution. 



A51. 05 Iferine Borers 



1. Teredlnldae . Teredinidae (no determioations made) were 

 active throughout the "brief period of the test. They occurred in 2 

 of the k control panels that Were received. One of these panels con- 

 tained only 12 specimens, no specimen was more than 15 mm in length, 

 and the other pemel had only seven Juvenile forms. The "breeding season 

 at this location is pro"ba"bly continuous. Teredinidae also occurred 



in all k of the test panels received. The test panel removed at the 

 end of one month contained 5 specimens up to 10 mm long; the panel 

 removed at the end of 3 months was filled with specimens up to I50 mm 

 long; the panel removed at the end of k months was half filled with 

 specimens up to 45 mm long; and the panel removed at the end of 5 months 

 was filled with specimens up to 58 Dtm long and also contained many 

 stenomorphs. Although the test was conti-iued for only 5 months, and 

 the second one of the test panels and its accompanying control panel were 

 lost, it is apparent that the attack was very hea'vy. 



2, Llmnoria . Llmnorla were very active at this location, and 

 there was a rapid increase in numbers up to the time the test was 

 terminated, thus indicating that If it had heen continued longer, the 

 attack would have "been much heavier. In the control panels, the 

 nomber of Llmnoria tunnels in the h received was 6, 10, 42, and 66O, 

 respectively. No LiiTiriorla were recorded in the first test panel sub- 

 merged. The second panel was lost, and there were 85, 75* ancL 2,600 



241 



