File:The artificial propagation of the rainbow trout (1896) (14802186273).jpg

Identifier: artificialpropag00seag (find matches)
Title: The artificial propagation of the rainbow trout
Year: 1896 (1890s)
Authors: Seagle, George A. (from old catalog)
Subjects: Fish Rainbow trout
Publisher: Washington, Govt. print. off.
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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Text Appearing Before Image:
Fig. 2.—Tin tray for use in muddy water. ARTIFICIAL PROPAGATION OP THE RAINBOW TROUT. 247 it is a good idea to run a feather through the eggs for the purpose of changing theirposition on the trays and to disclose any dead eggs or foreign matter that may behidden underneath. Great care should be exercised in handling the eggs at auy time,but after the first or second day from the taking until the appearance of the eye-spot,they should be handled with especial care, and then only when it is absolutely neces-sary, as during this period they are very delicate, and a good shaking up, or evenpassing a feather through them, will cause a heavy loss.
Text Appearing After Image:
Pig. 3.—Interior view of Hatchery showing men fishing out Dead Eggs. Time required to hatch the eggs.—The time required to hatch trout eggs, or fisheggs of any kind, depends almost wholly upon the temperature of the water in whichthey are placed. I do not know of any rule that can be depended upon in all cases.In Trout Culture, by Mr. Seth Green (page 29), I find the following regardiug theiucubation of eggs of the brook trout: A rule sufficiently accurate for all practical purposes is this : At :>0 degrees the eggs will hatch in50 days; each degree colder takes 5 days longer, and each degree warmer 5 days less; the difference,however, increasing as the temperature falls anil diminishing as it rises. The above rule is as good as any that I know of, but it will not do to depend uponit in all cases. The rainbows, however, will hatch out from li to 5 days earlier in anycase than the brook trout. Watching tin- eggs.—Two trays of 12,500 eggs each are as many as should be left inon

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