A26.05 r>fe.rln.e Borers 



1. Teredlnldae . Teredlnldae . Including Bankla katherlnae , B. 

 mexlcana, B. zeteki , Teredo ( Lyrodus T sp., T. afflnls group, and T. massa 

 group, were very active each year at this location. They occurred in 2l|- 



of the 57 control panels, ranging from minute pits to specjjoens up to l|-0 mm 

 in length. Evety control panel submerged from August l6, 19hk to August 

 16, 19^5^ contained Teredinidae, but they appeared only irregularly there- 

 after; These data show that the breeding season at this locality is more 

 or less continuous. Teredinidae occurred in all except 3 of "fcli© ^^ test 

 panels, with most of the panels submerged for 8 months, and even one panel 

 submerged for only k months being riddled. Specimens were recorded as 

 attaining a maximum length of 210 mm in 2 months in the test panels. The 

 attack rated as very heavy. 



2. Limnoria . Limnoria also were active throughout the period 

 covered by the test, occurring in, 22 of the 57 cbntrol panels and in 57 



of the kk test panels. The attack in the latter, however, rated generally 

 from a trace to slight, but attained a peak i^tlng of moderate late in 19^5. 



5. Pholadidae . Pholadidae ( Martesia and Hiata) occurred 

 irregularly, appearing in only one control panel in 19^7 and in all the 

 test pemels except one that were removed from November 16, 19^^ to July 

 16, 19^5* also in one panel in 19^7' ^© only length recorded in the 

 test panels was I6 mm. The Pholad attack rated slight in 19^5 • 



A26.0k Fouling Agents 



1. Silt . Silt occurred on all the pemels. The deposits on panels 

 of both the control and test series rajiged from traces to moderate. 



2. Algae . A trace of red algae was' recorded on a single test panel. 



5. Invertebrate animal phyla . 



a. Porif era . (sponges ) . Sponges occurred eiporadlcally on 8 of 

 the kk test panels. Most of these test panels had only a few colonies, but 

 one panel was 80^ covered. 



b. Coelenterata (hydroids ). Hydroids occurred on 52 of the 57 

 control panels emd on all of the kk test panels, the growths on the panels 

 of both series mostly ranging from traces to light. Tubulfaria was the only 

 form identified. 



c. Bryozoa (enci^sting and filamentous ). Encrusting Bryozoa 

 occurred on 9 of the 57 control panels and on 12 of the kk test panels. 

 Electra sp. occurred the most commonly, but Cryptosula p»^nasiajia and 

 Gemelliporidra laaagniporosa also occurred. Filamentous Bryozoa occurred on 



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