10 
BULLETIN OF THE BUREAU OF FISHERIES 
Let us first trace these groups backward to see whence they come. In the case 
of the larger group this is easily done. Neglecting minor changes of size, this group 
can be traced back through the spring and winter to the previous year, where we may 
leave them for the present. (See fig. 10.) 
The smaller group is less easily followed. They are not present in the commer- 
cial catch in the earlier months. An extensive search for this group of young has 
been carried on by seining in shallow water, representing many degrees of salinity, 
LENGTH IN INCHES 
Figure 6. — Half-month frequency distributions of the common shrimp from the outside waters of Georgia, July 1 to August 31, 
1931, showing the first appearance of the young shrimp of the year and the disappearance of the mature shrimp from the 
commercial catch. 
from ocean beaches to creeks and lakes far inland. Many localities yielded nothing. 
So far no young have been found on ocean or Gulf beaches either in Georgia, Louisiana, 
or Texas. In the marshes near the grass small shrimp were taken but proved to be 
young and adult palaemonids. Finally, in the summer of 1931, the young were 
found in the slightly brackish waters of Dover Creek at Lampadozier, Ga., 10 or 12 
miles from the sea. Here the young from 7 or 8 to 40 mm have been systematically 
collected during the proper seasons. 
In Louisiana during 1932 the young have been obtained under a variety of 
conditions ranging from the slightly brackish waters of Bayou Rigaud in lower Bara- 
taria Bay to the almost fresh waters of Little Lake. The latter is more than 20 miles 
