93 



It may be mentioned that 2 of the 3 males in which the condition of the repro- 

 ductive organs was not ascertained, but the position of recapture is recorded, 2 were 

 taken in the Moray Firth, 1 in March 1911, after 112 days, 141 miles distant, having 

 migrated at the rale of 12-6 miles ]icr 10 days ; the other, in April, after 133 days, 

 having gone 143 miles, at the rate of 1075 miles per 10 days. These males measured 

 357 and 38 cm. respectively, and had no doubt spawned in the Moray Firth. The 

 third fish was caught on 5th January 1911, aflei- 38 days, 13 miles to tlie south ;uid 

 west, the average rate being 3-4 miles. 



The condition of the reproductive organs was ascertained in 29 of the 35 adult 

 females recaptured, and in 5 of those under adult size. Among the adults, only 2 

 are described as " spawning " or " ripe " ; both were recaptured to the north. One 

 was caught in March 1911, after 112 days, near Banff, in the Moray Firth, having 

 travelled 112 miles, at the mean rate of 10 miles per 10 days ; the other was taken 

 in March 1913, after 835 days, at the Orkney Islands, 164 miles distant, the rate 

 in this case being 1-9 miles. Seven were " nearly ripe," and 6 were recaptured to 

 the northwards. One had migrated with great rapidity, being caught 56 miles 

 off, northward of Aberdeen, after 10 days, having moved at the rate of 5-6 miles 

 per day. A second was taken close to the same place in February, after 85 days, 

 the rate being 6-5 miles per 10 days. Two were recaptured off Banff, in the Moray 

 Firth, 112 and 113 miles distant, 1 in January, after 53 days, and the other in 

 February, after 85 days, the rate of travel being 21-3 and 13-2 miles per 10 days 

 respectively. The fifth fish was caught in March 1913, after 830 days, off Buchan- 

 ness, the rate in this case being -8 mile per 10 days ; and the sixth fish, which had 

 gone northwards, was found 11 miles distant in December 1911, after 381 days, the 

 rate being -3 mile per 10 days. One cf the " nearly ripe " females was recaptured 

 in December, after 31 days, 13 miles to the south and west, the rate of travel being 

 4-2 miles. 



Six of the females were " spent." Four were taken to the northwards, as 

 follows : — One in April 1911, north-east of Aberdeen, having travelled the 65 miles 

 in 149 days, at the rate of 4"4 iniles per 10 days. The other 3 were recaptured 

 much later, 1 in June 1912, after 563 days, only 4 miles distant ; this fish measured 

 35 cm. on liberation, and 42'7 cm. on recapture ; another was caught on 2nd 

 September 1912, after 644 days, near Fair Isle, the rate for the 184 days being 2'8 

 miles per 10 days ; the third was not recaptured till May 1913, after 885 days, off 

 the coast of Aberdeen, 64 miles away, the rate being -7 mile. Two of the " spent " 

 females were recaptured to the south-east, 1 in March 1911, after 121 days, 21 miles 

 distant, off St. Abb's Head, the rate being 1*7 miles ; the other was taken in March 

 1915, after 1566 days, only 11 miles from the place of liberation. 



Fourteen of the adult females were " immature," and the position of recapture 

 of 12 of them was ascertained. Eleven of these had migrated northwards, and 

 of them 5, at least, were taken beyond the limits of the spawning season, in June, 

 July, August, and October. They had migrated distances of 33, 53, 71, 75, and 

 149 miles, to the coast of Forfar, or Aberdeen, and one to the Moray Firth, and 

 were caught after considerable intervals (253 to 919 days), so that the rate of 

 travel ranged from "6 to 2*2 miles per 10 days. Of the others, 1 was taken in 

 June 1911, after 59 days, off Aberdeen, the rate being 7*9 miles ; this fish was 

 only 38"2 cm. in length. Another was got in January 1912, after 404 days, 

 near Aberdeen, the rate for the 56 miles being 1-4 miles ; it was 46 cm. long, and 

 is described as "rather immature " ; another was caught in January 1911, after 

 60 days, off Stonehaven, the rate of travel being 6*6 miles, and it is described as 

 " one-c[uarter ripe," and was 39' 6 cm. long. One was recaptured in May 1911, 

 after 156 days, only 6| miles distant ; another, also taken in May near Buchanness, 

 had gone 75 miles, the rate per 10 days being 4*4 miles ; it was 36'5 cm. on 

 liberation and 38"5 cm. on recapture. The last, recaptured to the north, was 

 taken in April 1911, only 3i miles from the station ; on liberation it measured 

 37' 5 cm., and on recapture 38*3 cm. 



Of 8 females, which were under adult size on recapture, the condition 

 of the reproductive organs was ascertained in 5 cases. Two, both taken in 

 January 1911, had migrated north and east; 1, of 37*5 cm., went 58 miles at 

 the rate of 9'1 miles ; the other, of 34' 7 cm., had migrated 19 miles, at the rate 

 of 3*8 miles. Two, one taken in December 1910, after 3 days, and the other in 



