filled with cultch barsfastened on the elevated cross bare, A cylinder with one end 

 open and directed downward lies at the junction of the upright support and the 

 elevated cross bars. An extension of the upright pipe rises above and is guyed by 

 wires to the ends of the elevated cross bars, and thus contributes further anchorage 

 for the cultch bags. The top of the uptight pipe is provided with a loop for receiv- 

 ing a line by which the collector is hoisted from and lowered into the water with a 

 power winch . 



The only means by which drills may reach the cultch on the collectors are 

 over the supporting central pipe and the inner and outer surfaces of the cylinder, 

 The latter is baffled internally to provide a labyrinthine passage,, and since it is 

 air tight and passes open end down into the water when the collector is lowered, it 

 traps a pocket of air. The baffle reduces the exchange of water between the inside 

 and the outside of the cylinder? and in combination with the air pocket probably 

 effectively stops the crawling of drills onto the seed oysters above . Upon standing 

 for a time the concentration of oxygen, particularly in the presence of decaying 

 organic matter which would tend to accumulate or could be introduced at the start, 

 is reduced in the air pocket, and~.such gases as methane, ammonia, carbon dioxide, 

 and hydrogen sulfide would tend to accumulate. The surfaces of the cylinder and 

 the lower portions of the collector are painted with antifouling compounds contamisg 

 an algicide. These should further increase the effectives of the cylinder as a 

 barrier to drill migration 



Glancy reports considerable success in obtaining oyster seed on his 

 collectors in heavily drill infested areas during his first season of large scale 

 trials in 1954, and is planning an expansion of his project. He finds that his 

 collectors do keep drills away from oyster sets. His experiments were carried 

 out for the most part in the waters around Robins Island in Peconic Bay, Long Island . 

 Setting was light last summer in this area and the final counts gave 100 to 500 spat 

 per bushel of cultch on the collectors while no spat survived on the surrounding 

 bottom. Size of the spat, which is increased in the greater flow of water off the 

 bottom, by the end of the summer averaged 1-1/4 inches with a maximum of 2 inches 

 in length . He transplanted 2, 000 bushels of this to other areas . 



Glancy' s collector should provide an unusually good means for determining 

 to what degree young drills on adjacent bottoms will ride on floating debris to oyster 

 seed in the collector. To date this has not occurred, or if it has, has taken place 

 to sc slight a degree that no noticeable effects have been observed. Glancy' s method 

 of drill control involves more handling and is more costly than the conventional 

 method of broadcasting shell on the bottom. But because of the critical shortages of 

 oyster seed in many areas it is becoming necessary to utilize methods such as 

 Glancy' s for the production of seed, and to place them on a paying practical basis . 



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