114 



American Fisheries Society. 



1918, when the research in connection with the work of the 

 Fisheries Division. 



"As comparatively little was known in a scientific way 

 about this common prawn of our salt and brackish waters, 

 better known locally as the lake shrimp, and as its habits 



Penaeus setiferus 1-2 natural size. Immature 

 female on left, sexually mature female on right. 

 Note that while longitudinal growth has been 

 slight, there has been considerable expansion in 

 width especially in the region of the cephalo- 

 thorax to ma]-:e room for the developing eggs. 

 This transformation usually takes place when the 

 shrimp attain a length of six inches. 



and migrations were very confusing even to fishermen best 

 acquainted with it, we had only a small foundation to begin 

 Vv^ith, including the writer's limited previous experience. 

 Furthermore, owing to insurmountable difficulties in the way 

 of rearing the species in captivity with the facilities at 



