Small Beam Net for Sampling Postlarval Shrimp 



William C. Renfro 



Postlarval peijaeid shrimp entering estuarine nursery grounds 

 through Galveston Entrance have been sampled twice weekly since November 

 1959. Study of these samples has shown seasonal fluctuations in immigration 

 and size composition of white and grooved shrimp postlarvae. 



Small beam net used 

 for sampling post- 

 larval shrimp. 



To catch postlarvae in shallow areas along the shore, a net was 

 designed which could be easily handled by one man wading. Essentially it is 

 a small beam trawl or bar net. The body is cut from a single piece of nylon 

 netting 75 by 68 inches, having 50 openings per square centimeter. The fin- 

 ished net is 5 feet wide on both the head and footropes by 28 inches long. The 

 throat is a canvas cylinder 8 inches long and 12 inches in diameter sewed to 

 the end of the body. Over the throat is tied a conventional 12-inch, No. 1 

 mesh plankton net with a removable bucket. This plankton net can be 



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