2Te 



other oil the north coast, off Strathie Point, at a distance of 57 niiles. The last 

 fish to he taken was a male, found 20 nules to the north and east, in April 1913. 



Distances travelled — 10 miles and under. — Eight fish, or 34-8 per cent., were 

 recaptured at distances of from 3 to 10 miles, 4 males, with an average of 5-9 miles, 

 and 4 females, with an average of 7-2 miles. One of the males and 1 of the females 

 were found to the north and west, 2 of the males and 1 of the females to the north 

 and east, and 1 male and 1 female to the south and east. 



10 to 20 miles. — Four, or 17*4 per cent., were recaptured at distances of from 

 12 to 19 miles ; 3 males, with an average of 16-8 miles, and 1 female at 12 miles. 

 One of the males and the female were found to the south and west, 1 male to the 

 north and west, and 1 to the north and east. 



Thus, 12 of the fish, or 52*2 per cent., were recaptured at distances under 20 

 miles. 



20 to 50 miles. — Eight fish, or 34-8 per cent., were got at distances of from 20 

 to 44 miles, 1 male at 20 miles from the station, and 7 females (53 "8 per cent.) at 

 a mean distance of 27 miles. All these fish were found to the north and east. 



50 to KK) miles. — Three fish, or 13 per cent., were recaptured at distances of 

 from 50 to 100 niiles, 2 males at 53 and 57 miles, and 1 female at 72 miles. One 

 male and the female went to the south and east, and the other male to the north 

 and east. 



None was taken at distances over 100 miles. 



Maturity. 



Males. — The condition of the repioductive organs was ascertained in only 3 of 

 the 14 males recaptured. One was described as " spawning " ; it was taken in 

 March 1913, after 746 days, ofE Strathie Point, on the north coast of Scotland, at 

 a distance of 57 miles to the north and west. 



One was described as " ripe " ; it was captured in January 1912, 15 miles to 

 the north and west. One was " nearly ripe " ; it was taken in December 1912, 

 19 miles to the north and east. 



Females. — The condition of the ovaries was recorded for only 3 out of 18 fish 

 recaptured. One, taken in April 1912, 20 miles to the north and east, was said 

 to be "nearly ripe." Another, found in March 1912, 33 miles to the north and 

 east, was described as " spent." The third was "immature." 



EXPERIMENT III. 



im April 1911. 



In this experiment, 50 marked plaice, viz. 20 males and 30 females, were hberated 

 at the same place as in the last experiment, the males measuring from 23'5 to 43*5 

 cm., and 17 being under adult size when liberated. The females varied from 

 26 to 56 cm., and 19 were under adult size on hberation. The fish used were taken 

 in the Dornoch Firth on the 17th, and were marked and kept in tubs until the 

 19th, o\\dng to the rough weather, when they were set at liberty. 



The numbers hberated and recaptured, arranged in 5-cm. groups, are shown in 

 the following table : — 



cm. cm. cm. c-m. cm. cm. cm. 



25-30-5 31-35-5 36-40-5 41-455 46-50-5 51-55-5 56-605 Total. 



F. Lib. .. 9 7 5 2 1 5 1 .30 



F. Recap. . . 1 5 2 — 1 1 1 11 



M Lib. . . 13* 4 1 2 — — — 20 



M. Recap. ..3 — — — — — — 3 



* Two at 23*5 cm. 



The number recaptuied was only 14, or 28 per cent., 3 males (15 per cent.) 

 and 11 females (36-7 per cent.). Two of the males were of adult size on recapture, 

 and 1 was under that size. Six of the females were of adult size, averaging 48"2 

 cm., as against 43 7 cm. on liberation. Five of the females were under adult size, 

 averaging 34*3 cm., as compared with 31*6 cm. on liberation. 



