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 
