installed, to "be operated on a 4-month tasis instead of the previous 8-month 

 basis. This change was made at all three locations on June 2k-. The 

 detailed figiires on the occurrence of Teredinidae at each of these locaticmfl 

 are summarized belov. 



a. Eeceivin'=; Station Pier. Teredinidae occurred in I5 of 

 the 58 control panels, although no forms were recorded prior to- April I6, 

 1945^ and they made their appearance in only one panel after March 17, 

 1947. They ranged from minute pits and embryonic specimens to specimens 

 up to 10 mm in length. The breeding season appeared to be limited to 

 the period lasting from February through November. Teredinida e occurred 

 in kO of the ^5 test panels, although no forms occurred until September 

 16, 19kk. A maximum length of kk6 mm (18 in. ) was recorded after 8 

 months' submergence, and 9 of the panels submerged for this length of 

 time was filled x),r riddled. The attack at this location rated very 

 heavy each year after 19kk. 



b. Pier Wo. 1 (Fuel Oil Pier ). Teredinidae occurred in 

 10 of the 58 control panels, although no forms were recorded prior to 

 April 16, 1945, or after March 17, 19^7. They ranged from minute pits 

 to juvenile specimens, but a maximum length of 45 mm was recorded in 

 one panel inadvertently submerged for 2^ months. The breeding season 

 appeared to be limited to the period lasting from February through 

 November. Teredinidae occurred in kO of the 45 test panels, with a 

 maximum length of 522 mm (21 in. ) recorded In a panel submerged for 



8 months. Seventeen of these panels submerged for 8 or more months were 

 filled or riddled. The attack at this location rated very heavy each year 

 after 1944. 



c. Pier No. 8 . Teredinidae , ranging from minute pits to 

 Juvenile specimens, occurred in 10 of the J>6 control panels, but only 

 2 minute specimens had appeared prior to June I6, 19^5* ^e breeding 

 season appeared to extend from February through November. Teredinidae 

 occurred in 58 of the 44 test panels, with a maximum length of 56O mm" 

 (about 22I in.) recorded in a panel submerged for 8 months. Of the panels 

 that were submerged for 6 or more months, I6 were filled or riddled. 



The attack at this location rated very heavy each year after 1944. 



2. Llmnorla . Limnorla were active at each of the locations 

 but occurred generally in small numbers. Their occurrence may be summarized 

 for each location as follows: 



a. Eeoelvlng Station Pier . Limnorla occurred sporadically 

 on 12 of the 58 control panels, but were not recorded after March 17^ 

 1947. The largest number on any one panel was 53 forms. They occurred 

 on 39 of the 45 test panels, but not until after October 16, 1944. 



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