74 



also by circumstances tending to loss. It may safely be concluded 

 that the intensity of fishing is about 30 per cent, of the popula- 

 tion over gauge size. This includes 42 females which migrated 

 north from the Beadnell region, and in practically every case left 

 Northumberland. The females which did not migrate were at 

 least 64, but the presumption is that very soon all would have 

 similarly left the district, their places being taken by migrants 

 from the south. 



The results again indicate the migration of the mature females 

 to the north, and that the migration may in many cases not take 

 place until the second season after that of ecdysis. The recapture 

 of females in the Beadnell region as late as July and October points 

 to the conclusion that the ripening and the migration may be 

 postponed for still another season. 



In a footnote to the last report the results of investigations 

 were given to show that the conspicuous migration of the females 

 was due to the ripening of the ovaries. Since then a number of 

 observations have been made which confirm thiS: 



No. 363 which was recaptured at Bummouth on July 4th, 

 1913, came to us ahve. It was kept in a tank, and spawned on 

 November 5th, 1913. It died on December 1st, and the few eggs 

 left in the ovary measured '46 -'52 mm. The spermathecse were 

 then empty. 



No. 480 which was recaptured one mile south of the Long- 

 stone in the Beadnell region on February 26th, 1913, was Ukewise 

 kept in a tank. It spawned on March 3rd, but did not retain the 

 ova more than a few days. This specimen is still ahve. 



These observations clearly indicate that the females which 

 have migrated and are approaching the spawning period have 



