99 



1912, all to the north and east ; 1 had moved only 13 miles ; 1 was taken in the 

 Moray Firth, at a distance of 154 miles ; and the third at the Orkneys, a distance 

 of 160 miles. The mean rate of travel per 10 days for the first was -36 miles, and 

 for the other 2, 4*5 miles. 



One "nearly ripe " male was eanght in October 1911, 6 miles south and west. 



Three adult males, taken respectively in June, July, and August, were "im- 

 mature." The condition of the testes of 1 of the 2 males under adult size was 

 ascertained ; it was " immature " ; the fish, which measured 32-32-3 cm., was 

 caught in April 5 miles to the south and west. 



Females. — Of 17 adult females, the condition of the ovaries was ascertained 

 in 16. None was " fully ripe," but 3 were " nearly ripe," and all were recaptured 

 north and east, distances of 53, 65, and 68 miles respectively, in December 1912, 

 March 1913, and March 1912, the mean rate of movement being -8 miles, -9, and 

 1-8 miles. 



One was " spent," a large fish, measuring 50-50-5 cm., and it was caught in 

 St. Andrews Bay in March 1912. 



Three were " maturing " ; 1, described as " fully half ripe," was caught on 

 28th February 1912, 51 miles north and east, off the coast of Aberdeen ; the 

 measurements were 41-45-1 cm., and it would doubtless spawn that year. The 

 second, measuring 38-45 cm. was " half-developed " when caught on 31st May 

 1912. 44 miles to the north-east ; the third, measuring 37-5-42-9 cm., was also 

 "half ripe" when caught on 19th February 1912, 23 miles west and north, in 

 the Firth of Forth. 



The ovaries of 9 were " immature." The fish had moved distances of from 

 4 to 25 miles, at rates ranging from -3 to 1-3 miles per 10 days ; 4 were recaptured 

 in June, July, August, and September ; of the others, 2 had returned to the Firth 

 of Forth, distances of 22 and 23 miles, and were taken in January and April ; 

 another, caught in April, had moved 5 miles to the south and west ; 2 were caught 

 in May. 



Of the 5 females under adult size on recapture, the condition of the ovaries 

 was ascertained in each ; 3 had returned to the Firth of Forth, and were taken 

 in February and May ; 1 was found off the coast of Northumberland in March, 

 and the fifth near the Bell Rock, in July. 



EXPERIMENT III. 



^UhAfril I'^n. 



The number of fishes marked and liberated in this experiment was 51, of which 

 16 were males, 33 were females, and 2 were of undetermined sex. The sizes of 

 the males ranged from 30 cm. to 38 cm., and of the females f loni 29 cm. to 54-5 cm. 

 The numbers hberated and recaptured are shown in the following table, arranged 

 in groups of 5 cm. : — 



? Sex Lib. . . — 2 — — — 2 



? Sex Recap. . . — — — — — — 



Of the males, only 1 measured less than 33 cm. on hberation, and of the females, 

 21 measured under 38 cm. 



The fish for this experiment were caught by the " Goldseeker " at Station VL, 

 in the Firth of Forth, about 3 p.m. on the 25th April, and were hberated about 

 8.30 p.m. on the same day. Three of the fish which had been marked died on 

 the passage, and others were substituted for them. 



The number of the marked fish recaptured was 28, or 54-9 per cent., viz. 

 9 males, or 56-2 per cent., and 19 females, or 57-6 per cent. Of the 9 maley, 



