MIGRATIONS OF COD 
57 
a new school of cod, D, appeared for the first time in August, 1925, and was still 
present in October. 
On the grounds 6 to 12 miles east-southeast of Round Shoal buoy, where we fished 
only once during 1925, the B cod formed the chief part of the stock of fish. A lack 
of comparable data for these grounds, such as we have for the Round Shoal to Rose 
and Crown grounds, precludes a worth-while discussion based on Figure 18, No. 1, 
alone. The recapture of an unusually large proportion of the Round Shoal to Rose 
and Crown tagged cod to the southeast and northeast (Chatham and South Channel) 
during the summer, together with the. waning of the B cod on these grounds, indicates 
that the B cod were dominant 6 to 12 miles east-southeast because they had moved 
eastward from the western part of Nantucket Shoals. 
At Great Rip buoy, where tagging was done only in August, practically the same 
stock of cod was present as in the Round Shoal to Rose and Crown region, excepting 
that the B cod were much more prominent. 
Figure 19. — No. 1= length-frequency distribution of 1,395 cod caught from Round Shoal buoy to Rose and Crown buoy Sep- 
tember 6-11, 1926. No. #=length-frequeney distribution of 483 cod caught at Great Rip buoy September 6-11, 1926 
LENGTHS OF NANTUCKET SHOALS COD CAUGHT IN 1926 
Only one cruise was made to Nantucket Shoals in 1926, but a good sample of 
the cod living in the Round Shoal to Rose and Crown region (1,395 fish) and around 
Great Rip (483 fish) was obtained. It was found in September that the Round 
Shoal to Rose and Crown B cod which declined in dominance throughout 1925 were 
entirely eliminated from the picture, and the C cod which were predominant through- 
out 1925 were now relegated to secondary importance. (Fig. 19, No. 1.) The D 
cod had forged ahead into first place, in fact, comprised about four-fifths of all the fish. 
At Great Rip buoy virtually the same stock of cod was present as around Rose 
and Crown and Round Shoal buoys, about 14 to 20 miles to the northward. Even the 
B cod, so dominant at Great Rip in August, 1925 (fig. 18, No. 2), had disappeared from 
there by September, 1926 (fig. 19, No. 2). The C cod which in August, 1925, averaged 
