194 



Over 100 miles. — Three, or 5-3 per cent., were got at distances over 100 miles, 

 a male, far offshore, 102 miles in the mean direction N. 71° E., and 2 females, 1 near 

 Fair Isle, at a distance of 169 miles to the north and east, and the other off Hartle- 

 pool, at a distance of 138 miles to the south and west. 



Maturity. 



Males. — Of the 23 recaptured, the condition of the testes was ascertained for 21. 

 None was described as " ripe." Two were " nearly ripe," 1 taken in December 

 1913, 41 miles to the south and west, and the other in October 1913, 65 miles to the 

 north and east. 



One was said to be " spent " ; it was got in the Moray Firth, at a distance of 

 100 miles, in May 1912. 



Two taken in November were described as " about half ripe," 1, 17 miles to the 

 north and west, and 1, 102 miles N. 71° E. 



One of those described as " immature " was taken in April 1912, 9 miles to the 

 north and west ; it measured 29'5-33-7 cm. 



Among the males under 33 cm. on recapture was 1, of 29*5-31 -8 cm., taken in 

 January 1912, 24 miles to the south and west, and described as " three-quarters 

 ripe." 



Females. — The condition of the ovaries was recorded in 30 of the 34 females 

 recovered. One was " fully ripe " ; it was caught in February 1912, 7 miles to the 

 north and west, and measured 38-39-2 cm. ; another, of 38-5-42 cm., was " ripe," 

 and was caught on 5th November 1912, 28 miles to the south and east. 



Two were " spent " ; 1, of 37-5-40 cm., caught in April 1912, 13 miles to the 

 north and west, and the other, of 47-5-43-3 cm., 33 miles to the north and west. 



Five were " nearly ripe," 3 caught at distances of 6, 25, and 28 miles to the north 

 and west, 1 in October 1911, and 2 in November 1911 ; 1 in October 1911, 35 miles to 

 the south and west, and 1, in April 1913, after 634 days, off Hartlepool, 138 miles 

 to the south and west. 



Among those of adult size which were " immature " on recapture were the 

 following : — Two taken in February, measuring respectively 35-41-3 cm. and 

 37-45-4 cm., at distances of 13| miles to the north and west, and 169 miles to the 

 north and east ; 2 in April 1912, 1, of 37-5-40-4 cm., 7 miles to the north and west, 

 and 1, of 39-5-42-1 cm., 26 miles to the north and east. 



EXPERIMENT IV. 



6th July 1912. 



In this experiment, 100 fish were marked and liberated, 49 males, 50 females, 

 and 1 whose sex was not ascertained. The sizes of the males ranged from 29 to 41 

 cm., and 20 were under the adult size ; the sizes of the females ranged from 28-5 

 cm. to 60 cm., and 35 were under the adult size on liberation. 



The numbers Uberated and recaptured, arranged in 5-cm. groups, are as 

 follows : — 



cm. cm. cm. cm. cm. cm. cm. 



25-30-5 31-35-5 3fi-40-5 41-455 46-50-5 51-55-5 56-fi0-5 Total. 

 F. Lib. . . 7 23 11 3 3 1 2 50 



F. Recap. 



M. Lib. 

 M. Recap. 



?Lib. . 

 1 Recap. 



The fish used in this experiment were taken in Kirkcaldy Bay, in the Firth of 

 Forth, on 5th July, and were marked and placed in tanks between 3-5 and 3-30 

 p.m. They were Uberated at 8-20 p.m. on the 6th, 10 of them having died in the 

 tanks in the interval. 



The number recaptured was 62, or 62 per cent., viz. 31 males (63-3 per cent.) 

 and 31 females (62 per cent.). 



3 15 6 1 3 1 2 31 



11 29 8 1 — — — 49 



5 19 6 1 — — — 31 



_ !_____ 1 



_______ 



