4 
BULLETIN OF THE BUREAU OF FISHERIES 
353-355.) Of these, 3 fish, or 18 per cent, were subsequently recaptured, all of them 
that same winter and all near where they were tagged. By 1892, around the Firth 
of Forth, 196 cod had been marked, of which 10, or 5.1 per cent, were subsequently 
recaught. Fish as small as 7 inches in length were utilized, and only 16 exceeded 20 
inches. Most of the recaptures were made locally, the farthest distance away from 
the point of tagging being 52 miles, and the mean period of freedom being about 
75 days. (Fulton, 1893, p. 189.) Further tagging in the North Sea has been recorded 
by Boreley, Strubberg, Graham, Weigold, and others. 
Boreley (1909, pp. 2-3) records the tagging of 252 cod in the North Sea from 1904 
to 1907, of which 16.6 per cent were recaptured — 32 fish within 6 months after tagging, 
8 fish 7 to 12 months later, and 2 fish after 13 to 15 months. Most of the cod were 
recaptured near the tagging grounds and none were taken outside of the North Sea. 
Weigold (1913, p. 119) reports returns from North Sea tagged cod as high as 60 per 
cent — 181 recaptures from 301 marked fish, most of them 20 to 39 centimeters long. 
Nearly all these were recaptured in the vicinity of the tagging grounds. 
Strubberg (1922) reports on the marking of cod in Banish waters from 1905 to 
1913. Out of a total of 1,547 tagged fish, 338, or about 22 per cent, were subsequently 
recaptured within the following time intervals: 316 within 1 year, 19 after 13 to 24 
months, 2 after 26 to 29 months, and 1 after 47 months. Most of the fish utilized 
for tagging ranged in length from 25 to 70 centimeters (10 to 28 inches), and most of 
these were below 50 centimeters (20 inches). A greater proportion of the smaller 
tagged cod was recaptured than of the larger (25 per cent of 1,170 specimens less 
than 60 centimeters, 10 per cent of 377 specimens 60 to 109 centimeters). 
The great majority of these fish were more or less stationary the first year after 
tagging, and many had shown no migration up to the beginning of the third year, 
which represents about the longest recapture interval. A few of the larger fish 
covered some distance within the North Sea, although the longest migration was 
that of a small fish (37 centimeters) which traveled 330 miles in 74 days. 
Cod tagged in 1921-22 off Flamborough, England, were recaptured near by, 
most of them the same winter and the summer which followed. About 16 per cent 
of the cod tagged close to shore were recaptured within about a year, while about 7 
per cent of the offshore tagged fish were retaken. (Graham, 1924, pp. 47-50.) 
Concerning the migration of cod in northern Norway, FIjort (1926, p. 8) points 
out that the mature fish undertake extensive migrations, "thousands of kilometers,” 
during the course of a year. He found that there was a yearly migration from the 
Barentz Sea southward along the Norwegian coast and a return migration back to 
the Barentz Sea. (Ibid., p. 9.) 
Around the Faroe Islands 4,093 cod were marked from 1909 to 1913. (Strub- 
berg, 1916, p. 3.) Most of these were from 30 to 90 centimeters (12 to 36 inches) 
long, the majority being below 60 centimeters. From 4,086 of these marked fish, 
1,658, or 40.5 per cent, were subsequently recaptured. (Ibid., p. 78.) The time 
interval for the 1,562 recaptures made from the experiments of 1909-1912 was as 
follows: 1,082 fish within 6 months, 334 fish in 7 to 12 months, 113 fish in 13 to 18 
months, 26 fish in 19 to 24 months, and 7 fish over 24 months. As a result of all 
these cod-marking experiments around the Faroes, the percentage of recaptures from 
various lots of fish ranged from 14.9 to 62.3, with a mean of 40.6 for all the fish. 
This being so, Strubberg believes that the values found indicate that from one- 
seventh to one-half (according to locality) "the growing stock of 35-50 centimeter 
