OF GREAT BRITAIN. 5 



and these Grilse spawn about November or De- 

 cember go back to the sea and (in many 

 cases) re-ascend the rivers the next spring as 

 Salmon, with a further increase of 4 to 12 Ibs. 

 Thus, a fish hatched in April, 1854, and marked 

 when migrating in May, 1855, was caught as a 

 Salmon of 22 Ibs. weight in March, 1856. 



10. It appears certain, however, that Smolts do 

 not always return during the same year as Grilse, 

 but frequently remain nine or ten months in the 

 sea, returning in the following spring as small-sized 

 Salmon. 



\_Nofe. It will thus be seen that the fry of the Salmon are 

 called PdrrS) or Parr, until they put on their migratory 

 dress, when they become Smolts and go down to the salt 

 water; Grilse if they return during the first year of their 

 migration ; and at all other periods Salmon.} 



11. It has also been clearly proved that, in ge- 

 neral, Salmon and Grilse find their way back to 

 spawn to the rivers in which they were bred some- 

 times to the identical spots, spawn about Novem- 

 ber or December,- -and go down again to the sea 

 as " spent fish," or " Kelts," in February or March, 



returning, in at least many cases, during the 

 following four or five months as ' clean fish," and 

 with an increase in weight of 7 to lolbs. 1 



1 Shortly before spawning, and whilst returning to the sea as 

 Kelts, or spent fish, Salmon are unfit for food, and their capture 



