tunnels, respectively, in panels submerged for 5^ ^f Bsid 5 months. 

 The Llmnoria attack at this location was rated as moderate on the 

 strength of the maximum number of tiuuiela recorded, but undoubtedly 

 it vould have been much heavier had the test been conducted longer. 



3. Pholadidae . No Pholadidae were recorded at this location. 



A51.04 Fouling Agents 



1. Silt . Silt occurred on all the panels of both the control 

 and test series, the deposits ranging from traces to moderate in each 

 series. 



2. Algae. A trace to a li^t growth of green algae occurred 

 on the first 2 control panels and on the first 2 test pemels received. 



5. Invertebrate animal phyla . 



a. Coelenterata (hydroids ) « Bydroids occurred as traces 

 on 5 of the k control panels and as traces to light growths on 5 of 

 the h test panels received. 



b. Annelida (marine worms ). A trace of serpulid ( Serpula ) 

 tubes occurred on one control panel and on 2 test panels. 



A5I.05 Summary and Conclxiaions 



1, Installation . A test board of the peuiel type was operated 

 by the 592d Naval Construction Battalion Maintenance Unit at Eniwetok 

 Atoll, ^farshall Islands, from March to August in 19^6, to determine the 

 identity and prevalence of marine borers and foiiling organisms occurring 

 at this location. 



2. Test Results . 



a. Borers . Teredinidae occiirred in destructive numbers, 

 and the severity of the attack was rated as very heavy. The breeding 

 season is probably continuous. Limnoria also were very active, and the 

 attack rated as moderate, although increasing rapidly at the time the 

 operation of the test board was discontinued. No Pholads were recorded 

 at this location. 



b. Fouling Orgsjiisms . Silt, green algae, and invertebrate 

 animals belonging to 2 phyla contributed to fouling of the panels. The 

 phyla were hydroids and serpulid worms. Bydroids occurred with the greatest 

 frequency, ajid serpulid worms sjid green algae occurred as infrequent 

 traces. 



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