295 



33 were under adult size ; the sizes of the females varied from 23 to 58*5 cm., and 

 42 were under adult size. 



The numbers liberated and recaptured, arranged in 5-cm. groups, were as 

 follows : — 



cm. cm. cm. cm. cm. cm. cm. cm. 



20-24-5 25-30-5 31-35-5 36^0-5 41-45-5 46-50-5 51-55-5 56-60-5 Total. 



F. Lib. 2 19 16 14 5 3 4 2 65 



F. Recap. — 10 7 11 1 — 3 1 33 



M. Lib. — 22 27 7 2 2 _ _ 60 



M. Recap. — 9 14 4 1 2 — — 30 



The fish were taken by the " Goldseeker " in the Dornoch Firth on the 14th 

 September ; they were marked between 3 and 4 p.m. and liberated next day between 

 4 and 5 p.m. ; none of the fish died while in the tanks. 



Twenty-four of the males were of adult size on recapture, ranging from 33 to 

 47-3 cm., and averaging 37-8 cm. ; they were free for from 33 to 910 days, the mean 

 being 299 days ; they migrated distances of from 3| to 124 miles, the mean being 

 26-6 miles, and the average rate -85 mile per 10 days. Six of the males were under 

 adult size, averaging 30-3 cm., as compared with 29*5 cm. on liberation ; they were 

 at liberty for from 35 to 176 days, the mean being 108 days, and they travelled 

 distances of from 19 to 24 miles, the mean being 21 miles, and the average rate 

 1-8 miles. Fifteen of the females were of adult size on recapture, averaging 44-4 

 cm., and ranging from 39 to 58-3 cm., as compared with a range of from 36 to 58-5 

 cm. and a mean of 42*1 cm. on liberation ; they were free for from 141 to 583 days, 

 the average being 242 days ; they travelled distances of from 11 to 122 miles, the 

 mean being 42-1 miles, and the average rate 1-9 miles. Eighteen of the females 

 were under adult size, averaging 32-8 cm., and ranging from 29 to 37-7 cm., as 

 against a range of from 26 to 36 cm., and an average of 30-6 cm. on liberation ; 

 they were at liberty for from 58 to 593 days, the mean period being 223 days ; 

 they migrated distances of from 7 to 25 miles, the mean being 18-9 miles, and the 

 mean rate -9 mile. 



The Extent and Direction op Migration. 



First Quarter. — Three males were recaptured in October, 1 at an unspecified 

 position in the Moray Firth, and 2 far into the Dornoch Firth, at 20| and 21 miles 

 to the north and west. Three males and 5 females were taken in November, a 

 male and a female simply in the " Moray Firth " at unspecified localities. One 

 male and 3 females were found far into the Dornoch Firth, in the same region as 

 those taken in October, at 20 miles to the north and west ; 1 male and 1 female were 

 got south-east of Clyth Ness^ at 16| miles to the north and east. In December, a 

 female was caught on Smith Bank, 25 miles to the north and east. 



Thus, in this quarter, 12, or 19 per cent., were taken, the position -of capture 

 being known for 9, or 14-3 per cent. ; 6 were found to the north and west, and 

 3 to the north and east ; 6 of the fish, or 67 per cent., returned to the Dornoch 

 Firth. 



Second Quarter. — A female was recaptured in January 1912, far into the Dornoch 

 Firth, off Embo, 20 miles to the north and west. In February, 9 males and 6 

 females were taken, 7 of the males and 5 of the females in the Dornoch Firth, at 

 distances of from 11 to 25 miles, and the other 3, 2 males and a female, at, or near, 

 Smith Bank, 25 and 26 miles to the north and east. Five males and 6 females 

 were recaptured in March, 1 female at an unspecified place in the Moray Firth, 3 

 males and 2 females in the Dornoch Firth, at distances of from 11 to 21 miles, 1 

 female close to Clyth Ness, 20 miles to the north and east, and a male to the south- 

 east of Clyth Ness ; another female was taken south-east of Berriedale Head, 14 

 miles to the north and east, and another on the north coast of Scotland, off Strathie 

 Point, at a distance of 80 miles. 



Twenty- seven were taken in the second quarter, or 42-8 per cent., the positions 

 of all but 1 being known (41-3 per cent.) ; 15 were found to the north and west, 7 to 

 the north and east ; 18 of the fish, or 69 per cent., had returned to the Dornoch 

 Firth. 



