3J to 196 miles, the mean being 50'fi miles, and the mean rate of travel 1-8 miles. 

 Thirty-three of the females were under adult size on recapture, varying from 

 27"3 to 37'9 cm., and averaging 35"6 cm., as compared with a range of from 27 to 

 38 cm., and an average of 34"8 cm. on Uberation ; they were at Uberty for from 

 6 to 526 days, the mean being 129 days ; they travelled journeys of from 4 to 

 140 miles, the mean being 30'5 miles, and the average rate 2'4 miles. 



The 7 whose sexes were not ascertained were free for a mean period of 185 davs ; 

 their sizes on recovery avei'aged 40'7 cm., as compared with 39 cm. on liberation ; 

 they travelled journeys of from 8i to 197 miles, the average being 81-8 miles, and 

 the mean rate 4*4 miles per 10 days. 



The Extent and Direction of Migration. 



First Quarter. — Right fish were recaptured in the remaindc- of October, 4 males 

 and 4 females. Three of the males and 3 of the females moved to the north and 

 west, for distances ranging from 7 to 13 miles : 1 male and 1 female were found 

 4 miles to the south and west. 



In November, 10 of the marked plaice were recaptured, 5 males, 4 females, and 

 1 whose sex was not ascertained. The last-named fish and 1 male and 1 female 

 were found to the north and west, at distances of from 8 to 44 miles ; 2 males 

 and 2 females were taken to the south and west, at distances of from 17 to 45 miles ; 

 1 male had moved 48 miles to the south and east, and other 2 to the north and 

 east, a male for 25 miles to near Buchanness, and a female 29 miles offshore to the 

 south-east of Buchanness. 



In December, 9 fishes were recovered, 3 males, 5 females, and 1 of unknown 

 sex. Two of the males moved distances of 20 and 32 miles respectively to the 

 north and west ; the other inale was found 10 miles to the south and west ; 3 of 

 the females were also taken to the south and west, at distances of from 10 to 49 

 miles, 2 being recaptured near Montrose, and another near the Bell Kock ; 1 

 female moved 10 miles to the north and east, and another 104 miles to the north 

 and west, being got, after 65 days, in the Moray Firth, to the east of Clyth Ness ; 

 the fish of unknown sex was also recaptured in the Moray Firth, off Whitehills, at 

 a distance of 77 miles to the north and west. 



In the first quarter, then, 27 fishes, or 13"9 per cent., were recovered, 13 (48' 1 per 

 cent.) to the north and west ; 10 (37 per cent.) to the south and west ; 3 to the 

 north and east ; and 1 to the south and east. 



Second Quarter.— hi January 1911, 14 fishes were recaptured, 5 males and 9 

 females. All were taken to the north and west, except 1 female to the south and 

 east, and another to the south and west. No less than 9 of these Esh, namely, 

 4 males and 5 females, were taken in the Moray Firth, 6 of them off Banff, at a 

 distance of 77 miles, and other 3 at distances of 93 and 97 miles ; 1 female was 

 got on the north coast of Scotland, north-west of Dunnet Head, at 140 miles distant, 

 after 84 days ; another was taken at Buckhaven, near Buchanness. at a distance 

 of 41 miles ; another, south-east of Buchanness, at a distance of 30 miles ; 1 of 

 the females was recovered offshore at a distance of 17 miles to the south and east, 

 and another at a distance of 15 miles to the south and west. 



Twenty-four of the plaice, 13 males, 10 females, and 1 of unknown sex, were 

 recaptured in February ; no fewer than 22 were got to the north and west ; 1 

 female was taken to the south and west ; and a male to the south and east. 

 Thirteen, viz. 12 males and 1 female, were recovered in the Moray Firth, 8 in the 

 cod-nets off Banff, at distances of 77 and 78 miles, the others mostly off the coast 

 of Caithness, at distances of 101 to 107 miles. All the males but one were " spawn- 

 ing " or " ripe," and the exception was " nearly ripe " ; the female was " almost 

 ripe " ; the fish of unknown sex was captured after 130 days at a distance of 197 

 miles to the north and west, namely, 11 J miles W.S.W. of Cape Wrath (58° 29' N. ; 

 5° 15' W.) ; it was. " spawning " ; 1 male was taken at a distance of 17 miles to 

 the south and east ; it was described as " mature " ; a female was recaptured a 

 httle east of the Isle of May, at a distance of 59 miles to the south and west ; it 

 was " just about to spawn " ; 7 females were taken at distances of from 11 to 34 

 miles north and west ; they were all "immature " ; 1 female, measuring 37*5 - 

 37"8 cm., recovered 16 miles to the north and west, was described as " ripe." 



