260 



male was taken 96 nailes to the north and west, and a female 45 miles, also to the 

 north and west. 



In January 1913, a female had gone 80 miles to the north and west, and in March 

 another female was taken, but the place of recapture was unrecorded. The next 

 recapture was a female in May 1913, 29 miles to the south and east. In July, a 

 female was captured, 77 miles E.N.E. J N. of Rattray Head, 131 miles to the north 

 and west. Two female's were recovered in September, 1, 19 miles to the south and 

 west, and 1, 36 miles to the south and east. In October, a male was taken 39 miles 

 to the south and east, and in November, another male 52 miles to the north and 

 west. In December, a male and two females were found, all to the north and wes1 , 

 the male at a distance of 70 miles, and 2 females at 60 miles. 



In January 1914, 3 females were taken, 2 at 80 and 99 miles to the north and 

 west, and 1, 74 miles to the south and east. In May, a male was found 36 miles 

 to the north and west, and in August, after 1117 days, another male, which 

 measured. 34 '5-44 "2 cm., at a distance of only 9 miles to the north and west. 



Distances travelled — 10 miles and under. — Only 1 fish, or 2*5 per cent., was taken 

 imder 10 miles, viz. a female, at 9 miles to the north and west. 



10 to 20 miles. — Eight, or 20 per cent., were found at distances of from 11 to 19 

 miles, 6 males (30 per cent.), with an average of 15-5 miles, and 2 females (10-5 per 

 cent.), with a mean of 18 miles. Two of the males were taken to the south and east, 

 2 males and 1 female to the north and west, 1 male and 1 female to the south and 

 west, and 1 male to the north and east. 



Nine fish, or 22*5 per cent., were thus recaptured at distances under 20 miles. 



20 to 50 miles. — Fourteen fish, or 35 per cent., were got at distances of from 20 

 to 45 miles, 8 males (40 per cent.), with an average of 33 miles, 6 females (31-6 per 

 cent.), also with an average of 33 miles. Three of the males and 2 of the females 

 were taken to the north and west, and 5 males and 4 females to the south and east. 



50 to 100 miles. — Twelve fish, or 30 per cent., were found at distances of from 

 50 to 99 miles, viz. 5 males (25 per cent.), with a mean of 66 miles, and 7 females 

 (36-8 per cent.), with a mean of 71 "8 miles. Three of the males and 5 females went 

 to the north and west, and all the other fish to the south and east. 



Over 100 miles. — No males were found over 100 miles away, but 4 females (21 

 per cent.) went distances of from 131 to 217 miles, the average being 172-25 miles ; 

 2 were got to the south and east, and 2 to the north and west ; 1 of unknown sex 

 was recovered 138 miles to the south and east. 



Maturity. 



Males. — The condition of the testes was recorded for only 6 of the 22 recaptured. 



One was " spawning " (" nearly spent ") ; it was taken in May 1914, after 1043 

 days, 36 miles to the north and west, and measured 30-41-3 cm. 



Three were described as " nearly ripe," all taken to the north and west, 1 in 

 November 1911, at a distance of 19 miles ; another in November 1913, at 52 miles, 

 and the third in December 1913, at a distance of 70 miles ; these fish were all above 

 adult size when hberated. 



One, taken in October 1912, 20 miles to the north and west, was said to be 

 " three-quarters ripe." 



Females. — Of the 20 recaptured, the condition of the ovaries was recorded in 7. 



One was " spawning " ; it measured 33-5-44-5 cm., and was taken in January 

 1914, 99 miles to the north and west. 



Two were described as " ripening," 1 found in January 1913, 80 miles to the 

 north and west, the other in January 1914, also 80 miles to the north and west. 



One was said to be " spent " ; it was caught in June 1912, 25 miles to the north 

 and west. Another, also taken in June 1912, 17 miles to the north and west, was 

 described as " apparently spent." 



OTHER EXPERIMENTS. 



Some other experiments were made in this region. 



On 15th July 1911, 26 plaice, which had been caught in the vicinity, were 

 marked and liberated at the same position as on the 14th, viz. 10 males, 14 females, 

 and 2 whose sex was not ascertained. The males ranged in size from 31 to 51-5 



