respective locations, in the order named, was 120, l60, and 20; their 

 maximum lens^hB were 40 mm in 10 months, 55 nm in 9 months, and 22 mm 

 in 8 months. 



g. Chorda ta (tunicates ). Tunicates occurred on a single 

 control panel and 2 test panels at the Receiving Station Pier, on a 

 single control panel and 7 test panels at Pier Wo. 1 (Fuel Oil Pier), 

 and on a single panel of "both the control and test series at Pier No. 8. 

 A maximum number of 30 colonies on einy one panel was found. Botryllus 

 schlosseri was the only species identified. 



A57.05 Summary eind Conclusions 



1. Installation . Three test "boards of the panel type installed 

 June 16, 19^1-, at three different locations at the Puget Sound Naval 

 Shipyard, Bremerton, Washington, are still "being operated. The results 

 of these tests have heen summarized to the end of 19^7. 



2. Test Results . 



a. Borers . Teredinidae were very active each year at each 

 of the locations. The "breeding season appeared to extend from Fe"bruary 

 or March through Novem'ber. The attack rated very heavy each year after 

 19^ at each location, panels submerged for 8 months frequently "becoming 

 filled or riddled. Limnoria were active at each location but generally 

 occurred In small numbers only, the severity of attack varying at the 

 different locations and in different years. At the Receiving Station 

 Pier, it never exceeded a trace except on one panel removed early in 

 19'i-7 after 10 months' submergence, where a peak low in the moderate 

 rating was attained. At Pier No. 1 (Fuel Oil Pier), the attack was low 

 in the slight rating in 19^5 and 1946 but attained a peak rating of 

 moderate in 19^7. At Pier No. 8, it rated slight in 19^5, attained a 

 peak rating of moderate in 19^6, and lapsed to low in the slight rating 

 in 19i^7. 



It became apparent from the use of panels made of a number of 

 different kinds of coniferous woods, including the heartwood and sapwood 

 of Douglas fir, at the three locations in 19Mi-, that Bankia setacea and 

 Limnoria attack one kind of wood as readily as another. 



b. Fouling Organisms . Silt, algae, and invertebrate 

 animals belonging to 7 phyla contributed to fouling of the panels. 



The latter comprised sponges, hydroids, encrusting and filamentous Bryozoa, 

 serpulid worms, barnacles, mussels and J.ingle- shells, and timicates. Of 

 these organisms, hydroids and barnacles occurred with great frequency; 

 filamentous Bryozoa and mussels occurred with moderate frequency; while 

 the occurrence of the others, as well as the algae, was merely sporadic 

 or occasional. 



167 



