66 
BULLETIN OF THE BUREAU OF FISHERIES 
Figure 24. — Length-frequency distributions, based on Table 28, of all cod 
caught on Nantucket Shoals from 1923 to 1929 by the Halcyon and the 
Albatross II. The .symbols A to D refer to the same stocks of fish as 
given on Figures 15 to 23 
Rose and Crown fish. Here, 
again, as in almost all previous 
cases, the Great Rip fish aver- 
aged slightly larger than the 
Round Shoal-Rose and Crown 
fish, which is added proof that 
fish living in this region grow a 
little faster than those living 10 
to 20 miles farther northward, 
around the other two buoys. 
We found further evidence 
in June, 1929, that large cod do 
not remain on Nantucket shoals 
for an extended period. At that 
time scarcely 1 per cent of the 
catch made by the Albatross II 
consisted of fish more than 34 
inches long. 
It was found, therefore, that 
during 1929, up to June, the D 
cod which were first noted in 
August, 1925, and some of which 
were still present the fall of 
1928, had virtually disappeared; 
that the E cod, which appeared 
in July, 1928, were on the wane; 
and that the F fish of October, 
1928, had become the dominant 
school of cod on the tagging 
grounds. 
The length distributions of 
all the cod caught on Nantucket 
Shoals from 1923 to 1929 by the 
Halcyon and the Albatross II are 
shown in Figure 24 and might 
be summarized as follows: 
1. Length frequencies have 
shown that the cod population 
on Nantucket Shoals is rather 
stable from spring to fall of most 
years and that usually relatively 
few cod migrate to or from the 
shoals throughout the summer. 
2. In the fall of some years 
a marked temporary change in 
the length-frequency distribution 
shows that “foreign” cod pass by 
