81 



ponderating migration northwards along the coast. Eiglit were taken within the 

 Firth of Forth, and all the others to the north of the station, 9 being caught north 

 of Rattray Head, on the north-east coast of Scotland. 



Of the remaining fish, 3 were taken in 1913, 20 in 1914, 2 in 1915, aiid 1 in 1916. 



Three males were captured in December 1913, 1, 23 miles to the north and east, 

 to the east of the Isle of May, 1 off Noss Head, in the Moray Firth, at a distance of 

 155 miles to the north and east, and 1 at " Smith's Knoll," off Yarmouth (Lat. 

 52° 50' N., Long. 2° 15' E.), at 271 miles distant to the south and east. The fish 

 taken off Noss Head had moved at the mean rate of 4-1 miles per 10 days, and the 



1 caught at " Smith's Knoll," at 6-9 miles. 



In January 1914, 1 male and 3 females were recaptured, all to the north and 

 east, 2 females off the coast of Aberdeenshire, at distances of 71 and 72 miles, and 

 the other female and the male in the Moray Firth, off Banff, at a distance of 145 

 miles. 



A male was taken in February, south-east of Aberdeen, at a distance of 68 miles. 

 In March, 3 males and 4 females were recaptured, but the position of capture of 

 one of the males was not ascertained. One female migrated in a southerly direc- 

 tion, and was taken 24 miles E. h S. of Hartlepool, at a distance of 113 miles to 

 the south and east. All the others migrated to the north and east, the 2 males 

 for 19 and 40 miles respectively, and the 3 females for 18, 24, and 33 miles. Two 

 females were recovered in April, both to the north and east, 1 south-east of Aber- 

 deen, at 72 miles distant, and 1 near Buchanness, at a distance of 86 miles. A 

 female was taken in May, far offshore, south-east of Aberdeen, at a distance of 

 106 miles ; another female, in June, north of Kinnaird Head, at a distance of 122 

 miles to the north and east ; another female in July, north-east of Rattray Head, 

 at 113 miles to the north and east, and in August, 2 females at 16 and 17 miles 

 to the north and east. None was taken in September, but in October a female 

 was recaptured at an iniknown place ; it was found in a box of fish at Birmingham 

 and forwarded to the " Fish Trades Gazette " in London, and the port of landing 

 is said to be Milford Haven. 



In April 1915, after 863 days, a large female, which measured 50 cm. on libera- 

 tion, but whose size on recapture was not recorded, was taken 20 miles to the 

 north and east. In June, a male was captured, near Buchanness, 91 miles to the 

 north and east. 



In January 1916, after 1124 days, a male, which measured 47'5 cm. on Ubera- 

 tion, was caught " inside of May Isle," at an unknown place. 



The chart, on which the fines of migration are represented for the whole experi- 

 n^ent, shows a great predominance of migration northwards, along the coast, and 

 spreading eastwards to the north of the Bell Rock, and off the coast of Aberdeen. 

 Only two of the marked fish recaptured were taken to the south of the Firth of 

 Forth, while 10 were got in the Moray Firth, or at its entrance, and 14 north of 

 Rattray Head. 



Distances migrated — 10 miles and under. — Six, or 8*9 per cent., were found at 

 distances of from 6 to 9 miles, 1 male and 5 females (12" 5 per cent.), the former 

 at a distance of 6 miles, and the latter at 8 miles on an average. The male and 



2 of the females went to the north and west, and the others to the north and east, 

 but all were recaptured within the Firth of Forth. 



10 to 20 miles. — Ten, or 14*9 per cent., were got at distances of from 11 to 19 

 miles, 3 males (IM per cent.), with an average of 16*3 miles, and 7 females (17'5 per 

 cent.), with an average of 14*7 miles. Two of the males and 5 of the females were 

 fomid to the north and east, 1 male and 1 female to the north and west, and a female 

 to the south and east. A male and female were recaptured in the Firth of Forth. 



Thus, at distances under 20 miles, 16, or 23"9 per cent., were recaptured, 4 

 males (14-8 percent.), with an average of 13"7 miles, and 12 females (30 per cent.), 

 with a mean of 12 miles. 



20 to 50 miles. — Eleven, or 16*4 per cent., moved from 20 to 43 miles, 5 inales 

 (18-5 per cent.), with an average of 31 miles, and 6 females (15 per cent.), with a 

 mean of 32"3 miles. All the males and 5 of the females were taken to the north 

 and east, and 1 female to the east and south. 



50 to 100 miles. — Twenty-two, or 32"8 per cent., were recaptured at distances 

 of from 52 to 99 miles, 9 males (33'3 per cent.), with an average of 74*8 miles, and 



