Section 20 

 GALVESTON, TEXAS — U. S. HA.TAL fROlTJUER BASE 



A20.01 Location of the Test Station and Test Board 



A test "board of the panel type, designated "by the symbol USN3-T-1, 

 was operated at the U. S. Uaval Frontier Base at Galveston, Texas, 

 from JvlLj 21, 19kk until July 15, l^kS, when it was discontinued 

 "because of termination of military activity at this Tsase. No details 

 were given as to the exact location of the test toard. 



Unfortunately, the continuity of this test was interrupted "by 

 the loss of thq test hoard on two occasions, first ahout November 19hk, and 

 again in August 19^5* "because of winds nearing hurricane force. It 

 was requested in November of this year that a new set of panels he Installed 

 and operated on a it-month basis. Instead of the 8-month basis previously 

 adhered to, because of the uii.usual severity of the attack by marine borers 

 at this location. Accordingly, a new set of panels was put into operation 

 on November 15- 



A20.02 Hydrographlc Data 



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

 installed was 28 ft; the tidal range was approximately l6 In.j the 

 velocity of the current was approximately l-g- knots. The temperature 

 of the water at the time of installation was 7^° E. The water was 

 reported to be generally muddy and the degree of pollution extreme. 



A20.05 Marine Borers 



1. Teredinldae . Teredinldae , including Bankia gouldl , B. mexioana , 

 Teredo ( Lyrodus ) sp . . and Teredo sp . , occurred in all the control 

 panels su"hmerged during the warmer months of the year, but no borers 

 were recorded in January and February of 19*<-5* nor during the period 

 extending from November 15, 19l<-5 to April l6, 19k6. The specimens 

 noted were mostly embryonic or small, although a maximum length of 60 mm 

 was recorded in the panel submerged from May 21 to June 21, 19^5. 

 A total of 6,950 minute specimens was recorded in a control panel that 

 happened to be left submerged for ij months at the end of 19kk. 

 The breeding season at this location extended from March through December. 



Teredinldae occurred in all the test panels throughout the 

 duration of the test, except in one panel su'bmerged from November 

 15* 19^5 to January l6, 19^6. At the beginning of the test in 



96 



