223 



west ; another in November 1911, 60 miles to the south and west, near the Pent- 

 land Skerries, the third in December 1910, in the Moray Firth, 73 miles to the south 

 and west, oE Noss Head ; the fourth in March 1912, north of Tarbet Ness, in the 

 Moray Firth, 100 miles to the south and west ; the fifth in November 1912, north 

 of Kinnaird Head, 66 miles to the south and west. 



One described as "^ ripe " was taken in December 1910, off Stonehaven, on the 

 east coast, at a distance of 147 miles to the south and west. 



Among those whose testes were " immature," was one measuring 34:-34"2 cm. 

 It was recaptured in April 1911, near the Bell Rock, at a distance of 170 miles to 

 the south and west. 



Females. — The condition of the ovaries was ascertained in 57 of the 83 recaptured. 



Only one was " spawning " ; it was taken in April 1913, after 907 days, on the 

 north coast, at a distance of 100 miles to the south and west. 



Two were described as " ripe," 1 taken in March 1912, on the north coast, at 

 a distance of 107 miles, and the other in June 1911, east of the Orkneys, 32 miles 

 to the south and west. 



Three were " nearly ripe," 2 taken in January 1911, both to the south and west, 

 1 east of the Orkneys, at a distance of 45 miles, and the other on the north coast, 

 at a distance of 116 miles ; 1 was taken in December 1910, off Noup Head. 



No less than 17 were described as " spent " ; 2 were taken in April 1911, 

 1 near Foula, 15 miles to the north and west, the other south-west of Cape Wrath, 

 140 miles to the south and west ; 1 was caught in May 1911, on the north coast, 

 off Strathie Point, 100 miles to the south and west ; 1 in June 1911, to the east of 

 the Orkneys, 39 miles to the south and west, and 2 in July 1911, 1, 21 miles to the 

 south and west, the other 10 miles to the north and west. A " spent " female was 

 recaptured in March 1912, off Strathie Point, on the north coast, at a distance 

 of 102 miles to the westwards ; in January 1912, another was captured 15 miles 

 to the north and west, and in April, 2, one off Noss Head; in the Moray Firth, 92 

 miles to the south and west, and the other near Cape Wrath on the west coast, at 

 a distance of 121 miles ; 2 were taken in May 1912, 1, 15 miles to the north and 

 west, and the other at Foula, 50 miles to the north and west. Two were taken 

 in June, 1 near Foula, 53 miles to the north and west, and the other east of the 

 Orkneys, 33 miles to the south and west. In May 1914, 1 was taken 13 miles to 

 the north and west, and in June, another 13 miles to the north and west. The 

 seventh " spent " fish had no date of recapture given. 



Among those of adult size with " immature " ovaries, 2 were recaptured in 

 April 1911, 1 measuring 39-40-6 cm., at the entrance to the Moray Firth, north of 

 Kinnaird Head, and the other measuring 37-5 to 39"5 cm., east of the Orkneys, 

 36 miles to the south and west. 



Among the females under adult size recaptured, was 1 taken in March 1911, 

 off Kinnai rd Head, 79 miles to the south and west, which was described as " spawn- 

 ing," measuring 34 to 35*5 cm. 



EXPERIMENT II. 



I5th September 1910. 



At this station, 7 miles S.E. by i E. of Fair Isle (59° 28' N. ; 1° 26' W.), where 

 depth was 52 fathoms, 30 marked plaice were liberated on 15th September 1910, 

 namely, 14 males, fifteen females, and 1 of undetermined sex. The size of the males 

 was from 32*5 to 38*5 cm., and of the females 34 to 43-5 cm., and 2 of the males 

 and 10 of the females were under adult size on liberation. 



The numbers Hberated and recaptured, arranged in 5-cm. groups, were as 

 follows :— 



F. Lib 



F. Recap. 



M. Lib. 

 M. Recap. 



? Sex . 



The fish used were caught in the vicinity by the " Goldseeker " on the same day. 



