473 
ee ——————————— _ 7 — ———— 
The number of eggs which can be accommodated in a jar varies with the par- 
ticular species—with recently gathered Whitefish eggs 3 quarts (108,000 eggs) 
are regarded as sufficient for a jar, but four or five quarts may be accommodated 
in the same jar when the eggs have become “ eyed.” 
The amount of movement of the contained eggs can be readily controlled in 
such a jar by pushing the inlet tube further out or in; Whitefish eggs, ¢.g., when 
first taken, are glutinous and require to be worked rapidly under a*full current 
with the inlet tube pushed down. Dead eggs, on the other hand, can be removed 
by pushing the outlet tube down into the superficial layer of eggs. When the 
hatching time arrives and the embryos are freed from the egg-membranes, they 
pass out from the outlet tube into a glass receiving tank, the current outward 
being barely sufficient to induce the fish to swim out. 
Whitefish embryos when first hatched are light gray in colour; they are 
dormant for two hours but then hecome quite active, more so than Salmon or 
Trout fry. The young may be fed on a paste made of 24 parts meal, 4 blood, 6 
water. Experiments are at present in progress on this phase of fish-breeding 
operations. 
It is now very generally conceded that it would be advantageous to reserve 
the fry of Salmonide till they have attained to some considerable strength and size 
before being turned out. The trouble is to find suitable food as nearly related 
as possible to their ordinary food. An effort has been made in the South of 
France to overcome this difficulty by raising water fleas (Daphnia p. 437) in basins 
intended for the purpose. It has been possible by allowing such basins to dry up 
to kill out noxious insects ; this desiccation, however, appears to be favourable to 
the winter-egys of the Daphnias, which hatch out in enormous numbers on the 
ponds being subsequently flooded. 
From the last report of Fish-breeding operations in Canada the following 
statistics relating to Ontario are extracted :— | 
There exist three hatcheries, the oldest one at Newcastle, where Mr. Samuel 
Wilmott made the first experiments and researches on this subject ; the second at. 
Sandwich ; and a third recently erected at Ottawa as an experimental and eduea- 
tional station. The Neweastle hatchery is chiefly devoted to Lake and Brook Trout. 
The Lake Trout are secured in two pounds at Wiarton during November; and in 
_ 1890, 11,125,000 eggs were obtained from 3,222 female fish taken in the pounds. 
It is interesting to note that there were captured at the same time 1,396 
males—an indication of the relative abundance of the two sexes. Of the eggs 
thus obtained 4,700,000 were put out as fry; 1,500,000 in the Georgian Bay, 
2,300,000 in Lake Ontario, and 450,000 in Lake Simcoe, while of the remainder 
9,900,000 were sent elsewhere in the Dominion as semi-hatched or eyed eggs. 
About 400,000 eges of Brook Trout were secured, one-fourth of which were 
distributed as eyed eggs, the remainder placed in various streams and ponds as fry. 
Of 2,750,000 Whitefish fry hatched out from eggs received from the Sandwich 
hatchery there were distributed to Lake Ontario (1,650,000), Georgian Bay 
(1,000,000), and Lake Simcoe (100,000). 
The Sandwich hatchery deals chiefly with Whitefish and Pickerel eggs, the 
latter being hatched out in the spring after the Whitefish fry have been disposed 
of. Ninety million Whitetish eggs were obtained in the Detroit River, which is 
