300 



Thus, 14; or 73 "7 per cent., were recaptured m the second quarter, 5 to the 

 north and east, 3 to the north and west and south and east respectively, 2 to the 

 south and west, and 1 at an unknown locahty. 



The next fish to be recaptured were taken in May 1915, a female off Nairn, at a 

 distance of 1 mile, and the other, also a female, 10 miles to the north and east, off 

 Findhorn. In June, a male was taken in the same locality as the last. The next 

 recapture was in February 1917, after 1185 days ; it was a male, taken 5 miles 

 to the north of Tarbet Ness. One male, which had gone 39 miles to the north and 

 east, had no date of recapture. 



Distances travelled — 10 miles and under. — Twelve fish, or 66*6 per cent., were 

 found at distances under 10 miles, 5 males (454 per cent.), with an average of 4*9 

 miles, and 7 females (100 per cent.), with a mean of 3"8 miles. 



10 to 20 miles. — Only 1, a male, was recaptured between 10 and 20 miles, namely, 

 13 miles to the south and east. 



20 to 50 miles. — Five, or 27*7 per cent., were got within these limits. All were 

 males (45*4 per cent.), taken to the north and east. 



Maturity. 



Males. — Of the 12 recaptured, the condition of the testes was recorded for 8. 

 Three were "spawning, ' all taken in February 1914, 2 off Brora, Dornoch Firth, 

 at 22 and 23 miles to the north and east, 1 off Clyth Ness, 46 miles to the north 

 and east. One was " ripe " ; it was taken in February 1917, after 1185 days, at 

 the mouth of the Dornoch Firth, 22 miles to the north and east. 



Females. — The condition of the ovaries of each of the 7 females recaptured was 

 recorded. Two were "spent," both taken in May 1915, 1 at a distance of 1 mile, 

 and the other 10 miles to the eastward, off Findhorn. 



Other Experiments. 



MORAY firth. 



I. On 22nd April 1910, 57 plaice were marked and liberated in the Dornoch 

 Firth (57° 58' N. ; 3° 45' W.) in a depth of 7-9 fathoms ; they comprised 29 males 

 and 28 females. Only 6 (10"5 per cent.) were recaptured, 4 males and 2 females. 

 The date and place of capture of 1 of the males were not ascertained ; another was 

 found on the market at Ymuiden, in May 1911, but the position of capture was not 

 ascertained ; the third male was taken in January 1911, 15 miles to the north and 

 east, off Golspie ; and the fourth, in February 1911, 2 miles south-west of the 

 Souters of Cromarty, 23 miles to the south and west ; 1 of the females was caught 

 at an unspecified place in the Moray Firth, and landed at Ostend ; the other was 

 taken in February 1911, off Dornoch village, 10 miles to the south and west. 



II. On 23rd April 1910, 32 marked plaice were liberated in the Dornoch Firth, 

 at 57° 54' N. ; 3° 52' W. in a depth of from 10-15 fathoms. They comprised 11 

 males. 20 females, and 1 of unknown sex. Seven, or 21 "9 per cent., were recaptured, 

 5 males and 2 females ; 3 of the males were caught at unspecified places in the 

 Moray Firth, and landed at Ostend, in February 1911, April 1911, and September 

 1910 ; of the other 2, 1 was taken in March 1911, 8 miles to the south and east, and 

 the other in June 1911, at N. Ronaldshay, Orkneys, 119 miles to the north and 

 east ; 1 of the females was landed in January 1911, at Ostend, the place of capture 

 being recorded merely as " Moray Firth " ; the other was taken in March 1911, 8 

 miles to the south and east. This fish, and the male, caught close together near 

 Tarbet Ness, were " partly spent." 



III. On 25th April 1910, 35 plaice — 20 males, 14 females, and 1 of undetermined 

 sex— were liberated in the Moray Firth, near Findhorn (57° 42' N. ; 3° 37' W.) in a 

 depth of 6 fathoms. Only 4, or 11*4 per cent., were recaptured, viz. 3 males and 

 the fish whose sex was not ascertained. One of the females was taken in February 

 1911, 3 miles to the south and east, and 2 were found in March 1911, 1, 8 miles to 

 the south and west, off Nairn, and the other 1 mile to the north and west. The 

 fish of unknown sex was also taken at this position, 1 mile to the north and west, in 

 March 1911. 



