10 
BULLETIN OF THE BUREAU OF FISHERIES 
The small percentage of returns for the monel tags is not considered significant 
because the numbers of tags used for the various metals are not comparable. The 
metals other than monel were used in April, May, and June, and many of these 
tagged fish were recaptured during the summer and fall by the Halcyon, whereas 
the fish tagged later in the year with monel tags did not have this same chance of 
recapture. In 1924, of 4,387 fish tagged with monel tags on Nantucket Shoals, 124 
or 2.83 per cent, were subsequently recaptured. 
Scale samples were obtained from all the cod caught beginning with 1924. The 
scales were pressed on the pages of small blank books opposite a number correspond- 
ing to that of the tagged fish, and in this way they could be easily referred to at any 
time. The length of the fish and any other necessary data were kept in suitable 
record books. 
Having established a method of marking the fish and recording the data, it was 
also necessary to advertise the tagging project among the fishermen and fish dealers. 
Cooperation naturally resulted, and much credit is due the fishermen for the many 
tag records which they have sent in. Without these our data would be wholly 
inadequate to justify sound conclusions regarding migrations. 
TABULATION OF THE FISH TAGGED 
A summary is given in Tables 4 and 5 of all the cod caught to the southward 
of Cape Cod and tagged on the present investigations. Not included with these 
fish are 1,859 cod marked and released directly from the dock of the United States 
Bureau of Fisheries biological station at Woods Hole, Mass., during each January 
of the years from 1926 to 1928. Besides these cod tagged between southern New 
England and New Jersey about 16,000 were tagged to the north and east of Cape Cod. 
Table 4. — Summary of all the cod tagged by the “Halcyon” and “Albatross II” off southern Massa- 
chusetts and to the westward from 1923 to 1929 1 
Dates when each 
cruise began 
and ended 
Locality 
Fish- 
ing 
days 
Fish- 
ing 
time 
Cod 
tagged 2 
1923 
Apr. 19-May 4... 
May 23-28 
Nantucket Shoals. 
No Mans Land 
Nantucket Shoals. 
_ ..do 
Number 
5 
5 
5 
6 
5 
7 
5 
4 
Hours 
34 
32 
48 
46 
42 
58 
41 
30 
Number 
244 
92 
424 
1, 144 
1, 795 
1, 354 
1, 556 
996 
Ang 16-23 _. 
Rp.pt 5—11 
do _ 
Oct 3 8 
Out, 14-17 
do - 
42 
331 
7,605 
1924 
July 13-17 
Nantucket Shoals. 
do 
5 
5 
4 
4 
47 
34% 
29 
35 
1, 254 
964 
460 
427 
Sept. 6-12 
Out 16 22 
Out 25-28 
do 
Total 
18 
145% 
3, 105 
1925 
Nautucket Shoals. 
4 
4 
5 
4 
2 
1 
35 
33% 
31 
28 
10 
6 
854 
673 
1, 158 
1,048 
277 
33 
do 
Opt 1 6 
Opt 24 28 
__do 
No Mans Land—. 
20 
14313 
4,043 
1926 
Seut. 5-11 
Nantucket Shoals. 
South Channel 
6 
1 
49 
5 
1,604 
2 
Total— .. 
7 
54 
1,606 
Dates when each 
cruise began 
and ended 
Locality 
Fish- 
ing 
days 
Fish- 
ing 
time 
Cod 
tagged * 
1927 
May 4-7 
Nantucket Shoals. 
Chatham grounds . 
Nantucket Shoals. 
Chatham grounds. 
Nantucket Shoals . 
Chatham grounds. 
Nantucket Shoals. 
Cholera Bank, 
N. Y. 
Number 
3 
2 
6 
2 
4 
1 
4 
6 
Hours 
1613 
15 
38 
14 
29% 
4% 
27 
33 
Number 
1,083 
259 
1, 497 
180 
1,264 
36 
1,176 
166 
June 17-25 
Aug. 31-Sept. 3— 
Oct. 14-17 
Nov. 14-21 
Total 
28 
177% 
5,661 
1928 
Feb. 18-27— 
Southern New Jer- 
sey. 
do _. 
7 
25% 
4 
133 
693 
19 
280 
7 
134 
279 
Mar. 23-Apr. 13 3 
July 13-21 ... 
Nantucket Shoals. 
Chatham grounds. 
Nantucket Shoals. 
Chatham grounds. 
Cholera Bank, 
N. Y. 
Southern New Jer- 
sey. 
5 
2 
6 
1 
10 
34% 
5 
35% 
2 
56 
Oct. 24-29 
Nov. 8-24 
Dec. 12-31 3 
Total 
1, 549 
1G9Q 
Jan. 1-Apr. 8 3 ... 
June 10-14. 
Southern New Jer- 
sey. 
Nantucket Shoals. 
Chatham grounds. 
South Channel 
468 
659 
6 
37 
4 
1 
1 
32% 
1 % 
434 
Total 
1, 170 
1 A list of all the recaptures that were reported is given on pp. 120 to 131. 
2 The total catch of cod was about 10 per cent greater than the number that were tagged, 
3 These fish were caught with long lines with small boats, 
