129 



being 2"85 miles per day. The remaining fisli, which measured 35*5 to 35-8 cm., 

 was caught 191 miles to the south-east by a Grimsby trawler, on 12th February, 

 after 77 days ; the position where it was recaptured was about 29 miles. E. J S. of 

 Spurn Point (53° 40' N. ; 0° 55' E.) ; the condition of the reproductive organ was 

 not ascertained. 



Tlius during the first 3 mouths after liberation, viz. December 1912, January 

 and February 1913, 31 fishes (23-5 per cent.) were recaptured, the positions 

 of recapture of 29 being determined. Of these, 16 (55-2 per cent.) migrated 

 to the north and east, for an average distance of 79 miles, the mean rate of 

 movement being 17-3 miles per 10 days; 6 (20'7 per cent.) moved to the north- 

 west, for a mean distance of 24 miles, the average rate of travel per 10 days being 

 3"4 miles ; 5 (17"2 per cent.) moved south and east for an average distance of 42 

 miles, the mean rate of travel being 7-6 miles ; and 2 (6-9 per cent.) went to the 

 south-west, for an average distance of 8 miles, the mean rate of travel being 9-2 

 miles per 10 days. 



It will be observed that, in this quarter, a large proportion of the fish went in 

 a northerly direction, with considerable rapidity, the mean direction being N. 31° E. 



Second Quarter. — In the next 3 months, 21 fishes (15-9 per cent.) were 

 taken, the positions of 19 being ascertained. In March, 10 of the fishes were 

 recaptured, 4 males and 6 females ; 1 moved directly west for 12 miles, and 1, 

 a male, south-west for 15 miles ; a third, a female, went north and west, into the 

 Firth of Forth, for a distance of 26 miles ; 6 moved north-east distances of from 

 29 to 157 miles, 4 of them being caught in the Moray Firth, after intervals of from 

 91 to 110 days, and the other 2 were got off the coast of Aberdeen. The position 

 of recapture of oiie of the females was not ascertained. In April, 3 males and 3 

 females were taken, the position of one of the males not being given. One, a male, 

 had gone 32 miles north and west, into the Firth of Forth, and was caught near the 

 place where it was originally captured. The other 4 fishes had gone north and 

 east, for distances of from 44 to 139 miles, 2 being taken oft" the coast of Aberdeen, 

 and 2 in the Moray Firth. Two males and 3 females were recaptured in May ; 1 of 

 the females had moved 17 miles to the south-west ; the remaining 4 fishes had 

 gone north-east, 3 being got off the coast of Aberdeen, at distances varying from 

 55 to 83 miles, while the fourth was caught in the Moray Firth, at a distance of 

 146 miles from the place of liberation. 



Of the 19 fishes, whose positions of capture were ascertained in this quarter, 

 14 (73-7 per cent.) had migrated north-east, the mean direction being N. 27° E., and 

 the average distance 95 miles. One fish moved directly west, and 2 (10'5 per cent.) 

 north and west, for an average distance of 29 miles ; 2 went south-west, for an 

 average distance of 16 miles. 



Third Quarter. — In June, July, and August, 32 fish (24-2 per cent.) were re- 

 captured, of which the positions were ascertained in the cases of 31. In June. 

 12 were recaptured, 2 males and lO females. One female went directly west 

 for 10 miles ; 4 migrated to the north and west, for distances varying from 6| to 

 26 miles ; 7. migrated to the north and east, for distances varying from 19 to 112 

 miles, most of them being taken off the coast of Aberdeen, and one in the Moray 

 Firth. In July, 11 fishes were captured, 5 males and 6 females. Three, 2 males 

 and a female, were taken to the south-west, at distances of from 5 to 18 miles. Five 

 had moved to the north-west, for distances of 15, 16, and 19 miles ; 1 was found 3 

 miles directly east ; and 2 to the north-east, both males, at distances of 8 and 26 

 miles respectively. In August, 9 of the fishes were recaptured, 6 males and 3 females. 

 Two of the males were taken at distances of 5 and 6 miles respectively to the south 

 and west ; 1 male and 2 females had moved north and west, 2 for 13 and 1 for 15 

 miles, and 3, 2 males and a female, had migrated to the north and east, for distances 

 of from 23 to 67 miles ; the position of capture of 1 male was not ascertained. 



Altogether, in this quarter, 1 fish moved west and 1 east ; 12 (38-7 per cent.) 

 migrated north and east for an average distance of 46 miles, at a mean rate of 2*2 

 miles per 10 days ; 12 (38'7 per cent.) had moved north and west, for an average 

 distance of 15 miles, the mean rate being -7 mile per 10 days ; none was found to the 

 south and east, but 5 (16-1 per cent.) were got to the south-west, the average distance 

 being 9 miles, and the mean rate per 10 days, -4 mile. 



Fourth Quarter. — In September, October, and November, 12 fishes (91 per 



5 



