114 



the vicinity of the Bell Rock, at distances of from 10 to 18 miles, the average being 

 15 miles ; the periods of hberty ranged from 56 to 63 days, and the mean rate from 

 1-7 to 3 miles. The male was recaptured to the south and east, only 1 mile from 

 the station, after 68 days. Two females had moved north and east for 20 miles 

 in 74 and 85 days respectively, the rates being 2-7 and 2-3 miles. The position 

 of recapture of the remaining female was not ascertained. All the hsh were 

 "immature," except 2 females. One, measuring 39-5 to 41-3 cm., was described 

 as " spent " ; it was taken 5 miles to the south-west on 27th May. Another, 

 measuring 40 to 40-9 cm., got on 2nd May 17 miles to the north-west was "rather 

 immature." 



Thus, the number recaptured in March, April, and May was 37, or 50-7 

 per cent, of all those recaptured ; 5 (38-5 per cent.) were males, and 32 

 (53-3 per cent.) were females. Particulars in regard to 35 were ascertained ; 

 17 (48-6 per cent.) moved to the south and west for an average distance of 8 

 miles at a mean rate of 18-1 miles, this high rate being due to the rapid movement 

 of the fish in March, as described above. Two (5-7 per cent.) went south and 

 east for an average distance of 5 miles ; 11 (31-4 per cent.) moved north and 

 west for an average distance of 14 miles, the mean late being 13 miles ; 5 were 

 caught north and east, at distances of from 20 to 86 miles, the average being 48 

 miles, and the mean rate 11-3 miles. The outstanding feature of this quarter 

 (well brought out on the chart) was the movement more or less westwards, chiefly 

 south and west, partly north and west ; but, 2 of the fishes, both females, caught 

 in April had, as we have seen, gone a long distance to the north and east. 



Second Quarter. — ^In June, July, and August, 11 fishes (15-1 per cent.) were 

 recaptured, of which 3 (23-1 per cent.) were males and eight (13-3 per cent.) were 

 females. Four females were taken in June, 2, 5 and 6 miles to the south and 

 west, 1, 7 miles to the north and west, and 1, 13 miles north and east. 'Ihree 

 were caught in July, 2 to the north and west, a male at a distance of 18J miles, and 

 a female at 16 miles ; a female went north-east for a distance of 37 miles. Four 

 were recaptured in August, 2 males and 2 females. Two were found to the south- 

 west, a male at a distance of 9 miles, and a female at 15 miles ; a male went 10 

 miles to the north and west, and a female 17 miles to the north-east. In this 

 quarter, therefore, 4 of the fishes (36-3 per cent.) were found to the south and 

 west, the average distance being 9 miles and the mean rate -6 mile ; 4 (36-3) 

 were found to the north and west, for an average distance of 13 miles, the mean 

 rate being 1 mile ; 3 (27-3 per cent.) were found north and east, the average dis- 

 tance being 22 miles, and the mean rate 19 miles. All the fishes were described 

 as " immature," except a female measuring 46 to 47-2 cm., caught on 13th June. 7 

 miles to the north and west, which was described as " apparently spent." 



Third Quarter. — In this quarter only 6 fishes (8-2 per cent.) w^ere recaptured, 

 3 females and a male in September, and 2 females in October. Two females, 

 taken in September, were found at 5 and 6 miles to the south and west ; 2, a male 

 and a female, were caught at 11 and 15 miles to the north and west, the male in 

 September and the female in October ; and 2 females were taken to the north- 

 east, 1 in September, off Tod Head, at a distance of 35 miles, and the other in 

 October, north-east of Kinnaird Head, at a distance of 92 miles, showing a mean 

 rate per 10 days of 4-4 miles. All were " immature," except a female caught on 

 11th September 6 miles to the south-west, which was described as "half-ripe." 



Fourth Quarter. — Two, a male and a female, were recaptured in December, 

 and 6, 1 male and 5 females, in February 1913, making 8 in all, or 10-9 per 

 cent, of the total recaptured. Two females had migrated into the Firth of Forth, 

 1, taken on 5th December and measuring 38 to 42 cm., to the south of the bay, 

 off Aberlady, a distance of 37 miles ; it was " three-quarters ripe " ; the second 

 returned to the vicinity of the locahty where it was originally caught on the north 

 shore ; it was taken on 20th February 1913, and measured 34-5 to 38'8 cm., and 

 was " immature." One female was caught on 3rd February 1913, 29 miles to the 

 south and east ; it measured 38 to 43 cm., and was " immature." Five of the 

 fish (62-5 per cent.) had migrated to the north and east for distances of from 37 

 to 114 miles, the average being 58 miles, and the mean rate 1*8 miles ; most of these 

 were recaptured off the coast of Aberdeen at distances of from 37 to 46 miles, 



