A22 . 05 Summary and Conclusione 



1. Inatallation . A test toard of the panel type installed at the 

 U. S. Naval Operating Base at Bermuda on July 1$, IShS, to determine the 

 identity and prevalence of marine horere and fouling organisms, is still 

 being operated. The results of this test have "been summarized to the end 

 of 1947. 



2. Teat Results . 



a. Borers . Teredinldae occurred only in small numbers late in 

 IShl , in a single test panel where the attack was slight. While there 



was little evidence of their activity at this location, records of the 

 William F. Clapp Laboratories show they are very destructive at other 

 points in Bermuda. Limnoria were very active throughout the period covered 

 by the test, frequently occurring in destructive numbers. Panels left 

 exposed for 8 months were almost completely destroyed. The attack rated 

 as extremely severe in both 19^6 ajid 19^7- A trace of Sphaeroma was 

 observed oii a single test panel in 19^6. Ko Pholadidae were recorded 

 at this location. 



b. Fouling Organisms . Silt, algae, and invertebrate animals 

 belonging to 5 phyla contributed to fouling of the panels. The latter 

 consisted of hydroids, encrusting and filamentous Bryozoa, serpulid 

 worms, barnacles and amphipods, and miscellaneous nonboring mollusks. 



Of these organisms, hydroids, encrusting Bryozoa, and serpulid tubes 

 occurred with considerable frequency; filamentous Bryozoa occurred with 

 less frequency, while the occurrence of the other forms, as well as the 

 algae, was merely sporadic or occasional.. 



5. Eecent Addenda . In both 19kQ and 19^9 the Teredinldae attack 

 at this station registered as very heavy. There was a slight attack of 

 Limnoria in both" these years. 



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