GRILSE 49 



because if the view in favour of the marine origin is 

 correct, our conception of the migratory habit must 

 be influenced accordingly. We must not regard the 

 descent to the sea, although it is the first migration 

 in the life of the individual fish, as the real direction 

 of migration, but rather that the parr is in fresh 

 water because the parent migrated from the sea to 

 spawn, and that the grilse and the adult fish alike 

 migrate primarily for the same reason, although the 

 condition of satiety plays an important part in the 

 case of early fish. When in a later chapter we deal 

 more particularly with the migrations of early and 

 late running fish the application of this conception 

 of the salmon's origin will again be taken up. 



More inquiry is still needed as to whether or not 

 grilse and small salmon enter certain rivers, and in 

 later life as large salmon enter other rivers. In Alaska 

 it is reported, for instance, that small fish of very 

 uniform size are found in some of the smaller rivers, 

 while in large rivers of that coast, such as the Fraser 

 in British Columbia and the Columbia river in Cali- 

 fornia, only a much larger fish, but again of uniform 

 size, is seen. In a report for the year 1905 * Mr. 

 Archer suggests that further inquiry may show that 

 this obtains more often than is supposed, and in- 

 stances a case of "a fish marked in the Figgen 

 river in Norway — a river in which the fish are 

 said seldom to attain to a weight of more than 11 or 

 12 lb., and are usually considerably smaller. This 

 fish weighed 5 lb. when first taken and marked, 

 and was recaught rather more than two and a 



* Board of Agriculture and Fisheries, Annual Report of Pro- 

 ceedings under the Salmon and Fresh Water Fisheries Acts, p. xviii. 



D 



