214 



The number recaptured was 44, or 44 per cent., a low proportion ; 18 (36-7 

 per cent.) were males, and 26 (51 per cent.) were females. Seventeen of the 

 males were of adult size on recapture, averaging 40*8 cm., and ranging from 

 34'7 to 48'5 cm., as compared with a range of 31"5 to 48"5 cm., and a mean of 39"5 

 cm. on liberation ; they were at liberty for periods of from 15 to 732 days, the mean 

 being 197 days ; the distances travelled varied from 4 to 150 miles, the mean being 

 54-3 miles, and the average rate of travel 2-7 miles. Twenty-three of the females 

 were of adult size, ranging from 39 to 51*8 cm., and averaging 45"9 cm., as com- 

 pared with a range of from 34 to 51*5 cm., and an average of 4o-4 cm., on liberation ; 

 their periods of freedom varied from 8 to 673 days, the mean being 229-9 days ; 

 the distances travelled ranged from 2 to 110 miles, the average being 27' 1 miles, 

 and the mean rate of travel 1-2 miles. 



The Extent and Direction of Migration, 



First Quarter. — Two fish were caught in the remainder of November, 1, a female, 

 after 8 days, 26 miles to the north and west, off Tod Head, and a male 48 miles to 

 the south-west, near the Bell Kock. 



A female was taken in December, 23 miles to the north and west, off Girdleness. 



One male and 5 females were recaptured in January 1914, all to the north and 

 west, except 1 female, "which was taken 52 miles to the south and west, south of the 

 Bell Rock ; the male was found 4 miles distant, and 3 of the females at 10 miles ; 

 the remaining female was got off Buchanness, at a distance of 35 miles. 



In this quarter, 9 fishes, or 20"4 per cent., were recaptured, 7 (77-8 per cent.) 

 at an average distance of 17 miles, N. 57° W., and 2 to the south and west. 



Second Quarter. — In February, 6 males and 1 female were recaptured, 2 of the 

 males to the south and west, at distances of 15| and 42 miles, the latter to the east 

 of the Bell Rock ; 1 male was taken at 8 miles to the north-west, and a female 

 32 miles in the same direction, in Aberdeen Bay ; 2 of the males were got in the 

 Moray Firth, 1 near Banff, at a distance of 74| miles, and the other north of 

 Tarbet Ness, at a distance of 119 miles ; the remaining male was recovered on the 

 north coast of Scotland, 4 miles east of Strathie Point, at a distance of 150^ miles. 



In March, 3 males and 3 females were recaptured ; a male and a female were 

 taken at 45 and 48 miles respectively to the south and west, to the south-east of 

 the Bell Rock ; 1 female was recaptured 4| miles to the north and east ; 

 and the remaining fish were taken in the Moray Firth, the female north-east of 

 Tarbet Ness, at a distance of 110 miles, one of the males off Burghead Bay, at a 

 distance of 106 miles, and the other south-west of Clyth Ness, at 110 miles distant. 



A female was taken in April, 37J miles to the south and west, south-east of 

 the Bell Rock. 



In this quarter, 14 fish, or 31-8 per cent., were recaptured, 8 (57-1 per 

 cent.) to the north and west, at an average distance of 89 miles in the mean 

 diiection N. 19° W. ; 5 (35"7 per cent.) to the south and west, at an average 

 distance of 38 miles in the mean direction S. 6° W. ; and 1 was found to the 

 north and east. 



Third Quarter. — One male and 3 females were recovered in May, all to the 

 south and west, the male at a distance of 31^ miles, and the females at respectively 

 15 J, 37, and 53 miles ; of the last 2., the former was got east of the Bell Rock, and 

 the latter north-east of St. Abb's Head. 



One male and 4 females were recaptured in June, the male 46^ miles to the 

 south and west, north-east of St. Abb's Head, and a female 21 miles to the south 

 and west ; the other 3 females were taken to the north and west, at distances of 

 9, 12|, and 12| miles respectively. 



In July, a male was caught 41 miles to the south and west, east and south of 

 the Bell Rock. 



In this quarter, 10 of the marked plaice, or 22*7 per ceat., were recovered, 7 

 (70 per cent.) to the south and west, at an average distance of 35 miles in the 

 mean direction S. 56° W., and 3 (30 per cent.) at a mean distance of 11 miles in 

 the mean direction N. 15° W. 



Fourth Quarter. — A male was taken in September, north of St. Abb's Head, 



