"Now we'll put just a little water in the pan," the foreman continued, "and leave it here to swell."
"Why should it swell?" asked Colin.
"The egg isn't really full when it comes from the mother fish," the foreman answered, "the yolk rattles around inside the shell, but after it has been mixed with the milt, it begins to suck up water, and in about half an hour it's full."
"What happens next?" queried Colin.
"That's about all. We put the eggs in frames so that the water has a chance to circulate freely, and then we go over the frames once or twice a week to pick out any eggs that may happen to die or not to grow just right."
"How long does it take before a fish comes
out?" Colin asked interestedly. "About a couple of weeks?"
"Weeks!" was the surprised answer; "we look for hatching to begin in about five months, and during all that time every tray of eggs is picked over once or twice a week. That keeps dead eggs from infecting live ones."
"You must keep them a long time, then?"
"Nearly a year altogether. Those in that trough right behind you are just hatching, they're from the first batch of spawn in the early spring run. Most of them are hatched out now, for you see only a few eggs in the tray."