16 
Obstructions in the river will interfere little with young 
fish artificially bred descending to the sea, although they are 
often fatal to the ascent of spawning fish, Returning to the 
artificial propagation of salmon, the selection of breeders is 
very important, eggs from young fish being far smaller in 
size and the fry hatched from them more delicate than is 
the case with ova spawned from mature breeders. I think 
it therefore necessary that the Salmon should be caught and 
selected so soon as the rod fishing closes, as by selecting the 
best hen fish the future stock of the water will be much 
improved. 
The non-migratory Salmones in this country are 
classed by Doctor Giinther under the following species— 
S. Fario: Ferox: Gilleroo Nigri-pinnis ; Orcadensis and 
Levenensis, but probably with the exception of the 
S. Levenensis, which more nearly approaches a marine form, 
these are all more or less permanent varieties of Fario; and 
their fry, at least those produced under artificial conditions, 
are more easily reared than the fry of the migratory species. 
Their cultivation may be said to consist in the selection of the 
oldest females tor breeding purposes, in the artificial incuba- 
tion of the ova and the rearing of the fry ; beyond this their 
culture resolves itself into a question of habitat and food, of 
habitat by choosing the species or variety best suited to the 
ends in view, and of food, for it is only by increasing the 
food supply in the water that the heaviest weight per acre 
and the most delicate quality of the flesh can be produced. 
The cultivation of the food supply in fresh water is effected 
by the reduction of coarse consumers of food who come in 
competition with the Salmones, by the cultivation, intro- 
duction, and acclimatization of fish whose value as food 
for Salmones is greater than the value of the sustenance 
they themselves derive from the water, as, for instance, the 
