A9.0U Fouling Agenta . 



1. silt . Silt occurred on all control and test panels, the 

 deposits ranging from traces to moderate; they were often oily. 



.2, Invertehrate animal phyla . 



a. Coelenterata (hydrolds ). Hydroids occurred on l8 of the 25 

 control panels and on 27 of the 28 test panels. They ranged from traces 

 to light or occasionally moderate growths. Tuhularla was the only form 

 identified. 



h . Bryozoa (encrusting ) . A trace of encrusting Bryozoa was 

 recorded on 2 of the test panels. Cryptosula pallasiana and Electra sp. 

 were identified. 



c. Arthropoda (crustaceans ) . Balanus (hamaclea) occurred on 

 8 of the 25 control panels and on 22 of the 28 test panels. Five control 

 panels, and the first of the test panels suhmerged for periods of one month 

 each during June and July, were from 20^ to 100^ covered, the maximum size 

 recorded "being 5 mm in diameter. A maximum diameter of 20 mm was recorded 

 on 5 test panels removed November 2, 19*^^/ and January 1 and February 1, 

 I9U5, after having "been su'bmerged for 5, 6, and 7 months, respectively. 

 Barnacles at this location appear to develop in greatest num"bers and make 

 their most rapid growth during the months of June, July, and August. 

 Amphipods ( Corophlum ) occurred more or leas ahundantly on 2 of the test 

 panels removed Decem'ber 1, ISkk, and January 1, 19^5, after having been 

 su'bmerged for 5 and 6 months, respectively, 



d. Molluaca (non'boring mollusks ). Mytllus (mussels) were more 

 or less' a'bundant on 2 control panels, where a maTlmum length of 8 mm waa 

 recorded, and on 8 test panels, where a maximum length of 50 ^"1 ^^^ 

 recorded on one removed January 1, 19l|-5, after having "been su'bmerged for 



6 months. Two apeclmena of Saxicava were recorded on a single one of the 

 test panels. 



e'. Chordata (tunicates ). Tunicates occurred on only the first 

 2 control panels and on 7 test panels, a maximum of 20 colonies "being 

 recorded on any panel. Botryllus schlosseri and Molgula sp. were the 

 only forms identified. 



A9.05 8^-'™mnyj and Conclusions 



1. Installation . A test "board of the panel type waa operated at 

 the TJ. S. Naval Magazine at Fort Lafayette, Brooklyn, New York, from May 3I, 

 2$kk until its discontinuance after Octo"ber 2, 19^6, to determine the 

 identity and degree of prevalence of marine horers and fouling agents 

 occurring at this location. 



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