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Numerous holes were mode on the surface of the majority of 

 these plastic rods by marine borers. The holes were made on 

 an area where lorge wooden bait pieces were fitted ot the 

 upper and lower section of eoch material. The borers had 

 ottacked the wood first and then continued into the plastic. 

 Penetration Into the plastic ceosed when the wood was 

 completely destroyed. Light hydrold growth was present on 

 all the materials. 



Water absorption: 0.02%. 



Water absorption: 1.70%. 



There were 22 deep-sea sponges (1/4 in. long) attached to 

 the surface of the plastic. Water absorption: 1.48%. 



Water absorption: 0.20%. 



Water absorption: 0.00%. 



Water absorption: 2.59%. 



There were 10 sponges attoched to the surfoce of the 

 plastic. Water absorption: 0.03%. 



There were 5 sponges attached to the surface of the 

 plastic. Water absorption: 0.35%. 



There were 5 sponges attached to the surface of the 

 plastic. Water obsorption: 0.03%. 



Water obsorption: 0.40°o. 



See remarks under Plastic Rods. A wooden dowling was 

 placed Inside eoch of the tubes to maintain rigidity. Only 

 the ends of dowlings were attacked by borers. 



The entire surface was covered with heavy bacterial sUme. 

 The vinyl tube seems to contain chemicals preferred by 

 microorgonlsms os a source of food. Outside diameter of 

 the tube was reduced and the tube was quite rigid. After 

 the tube was stored at omblent room temperature for about 

 o month, the tube was covered with a heovy fungi growth. 

 Water absorption: 0.65%. 



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Number and size of borer 

 holes underneath wooden 

 bait piece exposed about 

 3 ft above sediment 



5 shallow holes 



2 holes, 3/16 in. wide 

 by 1/32 in. deep 



None 



A single shollow hole 



2 shallow holes 



9 holes, 1/8 in. wide 

 by 1/32 in. deep 



20 holes, 3/16 in. wide 

 by 1/32 in. deep 



15 shollow holes 



30 holes, 3/16 in. wide 

 by 1/32 in. deep 



None 



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Number and size of borer 

 holes underneath wooden 

 bait piece exposed about 

 0.5 ft above sediment 



18 holes, 3/16 in. wide 

 by 1/16 in. deep 



40 holes, 1/4 in. wide 

 by 1/16 in. deep 



None 



15 holes, 1/8 in. wide 

 by 1/32 in. deep 



10 holes, 3/16 in. wide 

 by 1/16 in. deep 



50 holes, 3/16 in. wide 

 by 1/16 in. deep 



25 holes, 3/16 in. wide 

 by 1/16 in. deep 



100 holes, 1/8 in. 

 wide by 1/32 in. deep 



100 holes, 1/8 in. 

 wide by 1/32 in. deep 



30 holes, 1/8 in. wide 

 by 1/32 in. deep 





15- 



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3-ft-long specimens commercially 

 available through catalogs 



3/4 in. diam 

 3/4 In. diom 

 3/4 In. diam 

 3/4 in. diam 

 3/4 in. diom 



1 in. diom 



1 In. diom 



1 In. diom 



1 In. diam 



1 in. diom 



3 ft long, 1 In. OD, 1/8 in. 

 wall thickness, commercially 

 available 



Flexible, low-temperature 



tube, black 



ii 



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Plastic Rods 



Delrin 



Phenolic laminate 

 Polycorbonate 

 Teflon 



Cellulose acetate 

 Polyethylene 

 Extruded ocrylic 

 Polystyrene 

 Cost ocrylic 

 Plastic Tubes 



Vinyl 



40 



