140 



in 24 cases. One, of 38-5-42-8 cm., was "nearly ripe," and was captured in 

 September 1913, after 173 days, 4 miles to the west. 



Six are described as " spent." One, of 39-5-46-2 cm., was caught in May 1914, 

 after 421 days, 8 miles to the south and east. All the others were taken to the 

 north-east. One of these, 34-41-7 cm., was caueht in April 1914, after 377 days, 

 off the coast of Aberdeen, at a distance of 64 miles. Another, of 33-42 cm., was got 

 in May 1914, after 406 days, 10 miles distant. A third, of 32-39*8 cm., was re- 

 covered in June 1914, after 452 days, off the coast of Aberdeen, at a distance of 

 73 miles. The fourth fish was taken in May 1915, after 767 days, also off the 

 coast of Aberdeen, at a distance of 55 miles ; it measured 33-42-5 cm. The last 

 fish measured 40-5-48-2 cm., and was also caught in May 1915, after 768 days, in 

 the Moray Firth, at a distance of 112 miles. 



One fish, of 35-47-2 cm., caught in September 1915, after 911 days, 28 miles to 

 the north and east, was " half ripe." 



The remaining plaice were " immature." One was got in February, 2 in 

 March, 1 in April, 1 in May, 2 in June, 1 in July, 3 in August, 2 in September, 1 in 

 November, and 2 in December. Particulars in regard to those taken between 

 December and May are as follows : — Of the 2 caught in December 1913, 1 had 

 moved 9 miles to the south and east, after 251 days, and the other, 58 miles to the 

 north and east, after 271 days. The fish caught in February, measuring 38-5- 

 42-6 cm., was found, after 330 days, 11 miles to the north and west. Of the 2 taken 

 in March, 1, measuring 38-42-1 cm., was found 28| miles north-west, after 343 days, 

 in the Firth of Forth ; the other, measuring 37-44-8 cm., was recaptured, after 

 358 days, off Rattray Head, 106 miles to the north and east. The fish, captured 

 in April, measuring 40-5-48-6 cm., had moved 68 miles to the north and east, after 

 377 days. The plaice, recovered in May 1914, after 422 days, measured 33-5-40-6 

 cm., and was found 18 miles to the north and east. 



Experiments at 40 Miles East of the Isle op May. 



Four experiments were made at this place, approximately Lat. 56° 23' N. ; Long. 

 1° 23' W., where the depth is about 29 fathoms. The particulars of the experi 

 ments are as follows : — 



EXPERIMENT I. 



13th July im. 



In this experiment, 71 fish were Uberated, 42 being males and 29 females. 

 The males measured from 24 to 46*5 cm., and the females from 24*5 to 44 cm. The 

 ■number of males under the adult size (33 cm.) was 26, and of the females (38 cm.), 

 27. The numbers hberated and recaptured are shown in the following table, 

 arranged in 5-cm. groups : — 



