86 



Among those under adult size (38 cm.) on recapture, was one described as 

 " spawning " ; it measured 34'5-376 cm., and was found in January 1914, 67 miles 

 to the north and east, south-east of Aberdeen. 



Experiments at Twenty Miles East op Isle op May. 



At this position, which Ues about Lat. 56° 17' N. ; Long. 1° 58' W., where the 

 depth is 29 fathoms, 10 experiments with marked plaice were made, extending 

 from 28th November 1910 to 26th March 1913. 



The number of fish liberated was 961, consisting of 352 males, 597 females, 

 and 12 whose sexes were not determined. 



Six hundred and forty-three, or 66*9 per cent., were recaptured, viz. 239 males 

 (67"9 per cent.), 402 females (67-3 per cent.), and 2 of undistinguished sex (16'6 

 per cent.). 



Particulars for each of these experiments are given in the following table : — 



experiment I. 

 28<A November 1910. 



The number of plaice marked and Uberated in this experiment was 98, consisting 

 of 38 males, 59 females, and 1 whose sex was not ascertained. The sizes of the 

 males ranged from 33-40*5 cm., and the sizes of the females from 32-53 cm. The 

 sizes, in 5-cm. groups, are shown in the subjoined table : — 



F. Lib. 

 F. Recap. 



M. Lib. . 

 M. Recap. 



? Sex Lib. . . 1 — — — — 1 



? Sex Recap. . . — — — — — — 



The fish which were marked in this experiment were caught at Station VI. 

 Firth of Forth (off St. Monans), at 4 p.m. on the 28th November 1910, and were 

 marked and kept in tubs, v\dth a good circulation of water, until 7 p.m., when 

 they were Uberated. 



The number recaptured was 71, or 72*4 per cent., of^those Uberated ; 28, or 



