As the monthly ten^erature records given for the three locations 

 are almost identical, only one representative set of figures is given. 

 The following tahle records the temperature of the vater in degrees F, 

 based on readings taken at various times each month, showing the general 

 range throughout the year. 



^ 



A19 . 05 Marine Borers 



1. Teredinidae . Teredinldae , including Banlcla gouldi . Teredo 

 CPsiloteredo ), and Teredo sp,, were very active at all three locatioixs 

 throughout the period covered by the tests. In November 1944, because 

 of the severity of the attack, it was requested that the panels on the 

 test boards be removed and replaced by panels 2 inches thick. This 

 was done, but it was soon found that increasing the thickness of the 

 panels did not prolong their life, since the attack was Just as 

 severe proportionately in the 2- inch panels as it had been in the 

 one-inch panels. In November 1945, it was requested that all panels 

 on the test boards bd^ removed and that a new series be installed and 

 operated on a 4-month basis instead of being en5>loyed on the 8-month 

 basis. The detailed figures on the occurrence of Teredinidae at 

 each of these locations are summarized as follows: 



a. USHPF-1 (Ferry Slip at Naval Air Station ). Teredinidae 

 occurred in 27 of the 32 control panels, ranging from minute pits or 

 enibryonlc specimens tg specimens up to 4o mm in length. The breeding 

 season at this location generally extended from the middle of March 

 to the middle of the following February, but it was continuous from 



90 



