195 



Twenty-eiglit of the males were of adult size on recapture, ranging from 33"2 

 to 44 cm., and averaging 37 cm., as compared with a range of 29 to 41 cm., and an 

 average of 34"7 cm. on liberation ; they were free for from 5 to 822 days, the mean 

 being 291 days ; they migrated distances of from 5 to 172 miles, the mean being 

 60-7 miles, and the average rate of movement 2-1 miles. Three were under the 

 adult size, averaging 30-9 cm., as compared with 30-2 cm. on liberation ; they 

 were at liberty for a mean period of 124 days, and moved a mean distance of 30-2 

 miles at an average rate of 2-4 miles. 



Eighteen of the females were of adult size, averaging 46'3 cm. and ranging 

 from 38"5 to 602 cm., as compared with an average of 42-3 cm. and a range of 31-5 

 cm. to 60 cm. on liberation ; they were at liberty for from 39 to 1188 days, the mean 

 being 382 days ; they moved distances of from 8 to 106 miles, the average being 

 35-8 miles, and the mean rate of movement -9 mile. Thirteen were under the adult 

 size, ranging from 29-8 to 37*4 cm., and averaging 33-7 cm., as compared with a 

 range of from 295 to 36 cm., and a mean of 32-2 cm. on hbe ration ; they were free 

 for from 28 to 362 days, the average being 190 days ; and they travelled journeys 

 of from 7 to 70-5 miles, the average being 43-7 miles, and the mean rate 2-3 miles. 



The Extent and Direction of Migration. 



First Quarter. — Two males were got in the same month as they were hberated, 

 1, 10^ miles to the south and east, and the other 19 miles to the north and west. 



Four females and 1 male were taken in August, the male 9 miles to the north and 

 east, and all the females to the south and west, at distances of from 24 to 54 miles. 

 Three of them were recovered near the Bell Kock, 2 to the west of it, towards St. 

 Andrew's Bay, at distances of 52 and 54 miles, and the other to the south-east of it, 

 at a distance of 47 miles. The fourth female, described as " spent," was found 

 at a distance of 24 miles. 



One male and 5 females were recaptured in September, the male 16J miles to the 

 south and east, and 1 of the females 34 miles in the same direction, in the offshore 

 waters ; of the other females, 1 was taken 11 miles directly west ; another, near Tod 

 Head, 30 miles to the westwards ; a third, 24 miles to the south and west ; the 

 fourth, 57 miles to the south and west, to the north of St. Abb's Head. On the 

 chart, the lines of movement, with a few exceptions, are towards the coast, spread- 

 ing out between Tod Head and St. Abb's Head. 



In this quarter, 13 of the marked plaice, or 20-9 per cent., were taken, 6 at an 

 average distance of 43 miles, in the mean direction of S. 65° W. ; 3 (23-1 per cent.) 

 to the south and east, 2 to the north and west (N. 77° W.), 1 west, and 1 north and 

 east. 



Second Quarter. — Three males and a female were recovered in October, 1 of the 

 males to the north and west, and the other fish to the south and west, the female 

 at a distance of 23 miles, 1 of the males at 24 miles, and another at 44 miles, near the 

 Bell Rock ; the remaining male was taken near Tod Head, at a distance of 30 miles 

 to the west and south. 



Three males and 1 female were taken in November, 1 of the males near Tod 

 Head, 30 miles to the westwards, and all the others to the south and west, 1 of the 

 males at a distance of 20 miles, another south-east of the Bell Rock, at a distance 

 of 41 miles, and the female off Dunbar, 65 miles to the south and west. 



Two males were caught in December, 1, " nearly ripe," off Aberdeen, at a distance 

 of 23 miles to the north and west ; the other, 27 miles E. h S. of Hartlepool, at a 

 distance of 133 miles to the south and west. 



In this quarter, 10, or 16-1 per cent., were recaptured, 7 (70 per cent.) to the 

 south and west for an average distance of 50-3 miles, the mean direction being S. 

 54° W. ; 3 (30 per cent.) were got to the north and west, the mean distance being 

 28 miles in the mean direction N. 66° W. The chart shows much the same condi- 

 tion as in that for the previous quarter, only 1 marked plaice being caught to the 

 north of the station. 



Third Quarter. — In January 1913, 3 males and a female were recaptured. The 

 female, measuring 33-34-5 cm., and " immature," was taken in the Firth of Forth, 

 near Elie, at a distance of 65 miles to the south and west ; 1 of the males was 

 caught 88 miles to the south, 42 miles E.S.E. J S. of Longstone Light ; it measured 



