No. of 

 Fisli. 



4501 

 4474 

 4543 

 4028 

 4491 

 4473 

 4558 

 4534 

 4475 

 4559 

 4464 

 4531 

 4477 

 4527 

 4525 



Lib. (cm.) 



123 



Date of Recapture. 



13 Feb. 1914. 

 1 Auij. 1912. 



27 May 1912. 



14 May 1912. 

 20 Aug. 1913. 



1 May 1912. 

 17 June 1912. 



6 May 1912. 



9 Sept. 1914. 



1 April 1913. 



5 Oct. 1912. 

 12 Jan. 1913. 

 14 Feb. 1913- 

 10 July 1913. 

 22 Feb. 1914. 



R.O. 



Nearly ripe. 



Nearly ripe. 



Spent. 



Immature. 



Immature. 



Immature. 



Spent. 



Immature. 



4 i-ipe. 



Inmiature. 



I ri].e. 



Nearly ripe. 



Spent. 



Appar. .sj>ent. 



Spent. 



It vnW be seen tliat the majority of the large females, though often at Uberty 

 for long periods — as much as 868 and 660 days — were recaptured within a few 

 miles of the station. It is clear from this, and from the condition of the ovaries, 

 that many of the large females may remain in the neighbourhood of the station and 

 spawn there, without undertaking any migration worth speaking of. 



EXPERIMENT VIII. 



lOth May 1912. 



In this experiment 100 fishes were marked and hberated, viz. 43 males, 56 

 females, and 1 whose sex was not determined. The sizes of the males ranged from 

 28-5 cm. to 42 cm., and of the females from 26 cm. to 53-5 cm. The numbers 

 liberated and recaptured, arranged in 5-cm. groups, are shown in the accompanying 

 table : — 



On Uberation, 10 of the males and 39 of the females were under adult size, 

 viz. 33 cm. and 38 cm. respectively. The fish were taken in Kirkcaldy Bay, Firth 

 of Forth, partly on the 8th May and partly on the 9th ; they were marked between 

 9.30 and 10 a.m., and between 1.40 and 2.15 p.m. on the 9th, and kept in tanks of 

 running water, in the usual way, until 11.30 a.m. on the 10th, when they were 

 Uberated. None of the fish died in the tanks. 



The number of the marked fish recaptured was 59 (59 per cent.), of which 26, or 

 60-4 per cent., were males, and 33, or 58-9 per cent., were females. Twenty-three of 

 the males were of adult size, when recaptured, and 3 under that size (33 cm.). 

 The lengths of those of adult size varied on liberation from 28-5 to 39 cm., the 

 average being 33-6 cm., and on recapture from 33-2 to 41-1 cm., the average being 

 36-5 cm. ; the periods of freedom varied from 14 to 679 days, the mean being 189 

 days ; the distances migrated were from 2 to 229 miles, the niean being 29-2 miles, 

 and the average rate of travel was 1-06 miles per 10 days. The periods of freedom 

 of the 3 males which were under 33 cm. on recapture ranged from 1 to 75 days, the 



