250 



to the north and west ; another, of 40"5-41 cm., caught in the Moray Firth, off 

 Banff, at a distance of 122 miles to the north and west ; and the third, of 28'5-30 

 cm., 60 miles E. | S. of Spurn Point, at a distance of 181 miles to the south. There 

 is little doubt that, from the size of this fish, its description as " spent " was a 

 mistake. 



Two females were recovered in May, both to tlie south and west, one, measur- 

 ing 3r5-31"5 cm., at Holy Tsle, Northumberland, at a distance of 94 miles, and 

 the other, of 38"5-40 cm., south-east of Loagstone Light, at a distance of 79 miles. 



In the fourth quarter, therefore, 7 of the fish, or 28 per cent., were recap 

 tured, 4 (57-1 per cent.) to the north and west, 2 to the south and west, and 1 to the 

 south. 



Thus, in the 12 months immediately following liberation, 14 plaice, or 56 

 per cent., were recovered, 8 (57.1 per cent.) to the north and west, 5 (35'7 per cent.) 

 to the south and west, and 1 to the south. 



In the remaijider of 1914, other 9 fishes were taken ; none was recaptured in 

 1915 ; 2 were obtained in 1916. 



In July 1914, 2 males and a female were taken, one of the males 42 miles to the 

 so^lth and west, and the other near Aberdeen Bank, 50 miles to the north and west ; 

 the female was taken offshore, cast of Aberdeen, at a distance of 37 miles to the 

 north and v/est. A female was caught in September, after 461 days, near shore, 

 west of Longstone Light, Northumberland, at a distance of 93 miles to the south 

 and west ; it measured 30-5-39 cm. In October, after 483 days, a male, of 26-5 

 cm. on liberation, but of unknown size on recapture, was got offshore, 74 miles 

 N.E. by E. i E. of Flamboiough Head, at a distance of 112 miles to the south and 

 east. Two males and a female were recovered in November, the female, of 47-47"8 

 cm., offshore, 80 miles E. h N. from Grimsby, at a distance of 167 miles to the 

 south and east ; one of the males, of 33'5-35-7 cm., north-east of Longstone Light, 

 60 miles to the south and west ; and the other, of 26-5-32 cm., near the Bell Rock, 

 at a distance of 84 miles to the west and north. A female, of 29 39-7 cm., was 

 caught in December, after 553 days, near the coast to the south-east of Aberdeen, 

 at a distance of 70 miles to the north-west. 



In January 1916, after 943 days, a male, of 30-5-38 cm., and " spawning," 

 was recovered, near Aberdeen Bank, at a distance of 50 miles to the north and 

 west. In May, after 1065 days, a female, which measured 44-5-48-8 cm., was 

 recaptured offshore, at a distance of 33 miles to the north and east. 



As in the previous experiment at this station, the chart, on which the lines of 

 migration are drawn, shows that the movement of the great majority of the niarked 

 plaice was westwards towards the coast, the most notable exceptions being those 

 which were taken off Flamborough Head and off Grimsby. 



Distances travelled~10 miles and under. — Only 1 fish, a female, was found in 

 this category, at 10 miles to the south and west. 



10 to 20 iniles. — Oiie female was got 19 miles to the north and west. 



20 to 50 miles. — Six, or 24 per cent., were recaptured at distances of from 33 to 

 50 miles, 3 males (30 per cent.), with ar average of 47-5 miles, and 3 females (20 

 per cent.), with an average of 36-3 miles. Two of the males and 1 of the females 

 were taken to the north and west, off the coast of Aberdeen, a itiale and a female 

 were found to the south and west, and 1 female to the north and east. 



50 to 100 miles. — Thirteen, or 52 per cexit., were got at distances of from 57 to 

 94 miles, 6 males (60 per cent.), with an average of 70-7 miles, and 7 females (46-7 

 per cent.), with an average of 75-9 miles. Five of the males and three of the 

 females were found to the north and west, 1 male and 4 females to the south and 

 west. 



Over 100 miles. — Four, or 16 per cent., migrated more than 100 miles, 1 male, 

 which went 112 miles to the south and east, and 3 females, 1 of which travelled to 

 the north and east for a distance of 122 miles, being taken in the Moray Firth, 

 while the other 2 migrated to the southwards, 1 for 167 and the other for 181 miles. 



Maturity. 



Males. — The condition of the testes was ascertained only in 5 of the 10 recap- 

 tured. One was " spawning " : it measured 30-5-38 cm., and was caught in 



