4 
BULLETIN OF THE BUREAU OF FISHERIES 
Table 1. — Shrimp taken in the United States in 1930 according to districts 1 
Section 
Catch 
Value 
Pounds 
88, 117, 000 
2, 785, 000 
932, COO 
341, 000 
Percent 
95.43 
Dollars 
2, 995, 000 
49, 000 
42, 000 
29, 000 
15, 000 
4,000 
Percent 
95. 56 
3. 02 
1. 56 
1.01 
1.34 
Middle Atlantic States... .. .... _ _ . .. 
.37 
.93 
147, 000 
5, 000 
. 16 
. 48 
.01 
.13 
92, 327, 000 
100. 00 
3, 134, COO 
100. 00 
1 No catch was reported in the Chesapeake Bay States or in the States bordering on the Great Lakes. 
Trachypenaeus shows a family resemblance to Penaeus but is much smaller and 
the rostrum, although armed with 7 to 9 spines above, is smooth below. Xiphope- 
naeus differs from all the 
other penaeids in having a 
rostrum as long or longer 
than the carapace and the 
fourth and fifth pairs of 
walking legs much elongated 
and slender. These four 
long legs, together with the 
two antennae or “feelers” 
projecting beyond the 
“head” gave rise to the 
term “six barb” among the 
French fishermen. This has 
been corrupted to “sea 
bobs”, and it is by this 
name that they are gener- 
ally known. Sicyonia is an 
uncommon small form read- 
ily distinguished by the very 
short rostrum and the crest 
which continues from the 
rostrum down the middle of 
the body. 
Of the penaeids, Sicyonia 
and Trachypenaeus are inci- 
dental only and of no eco- 
nomic importance. Xipho- 
penaeus may contribute 2 or 
3 percent to the catch. It 
is too small to be used in canning but finds its way int° the fresh markets and dry- 
ing platforms. P. brasiliensis may at times be abundant but forms less than 5 
percent of the total. The single species Penaeus setiferus accounted for about 90 
percent of all the shrimp taken in the United States, or 100 of the 113 million 
pounds caught in 1929. 
Figure 4.— Lateral view of the carapaces of A, the common shrimp; B, the grooved 
shrimp; and C, the sea bob. In both the common shrimp and the grooved 
shrimp teeth appear on both the upper and lower surfaces of the rostrum, while 
in the sea bob they are absent from the lower surface. 
