File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14761101351).jpg

Identifier: manualoffishcult00unit (find matches)
Title: A manual of fish-culture, based on the methods of the United States commission of fish and fisheries
Year: 1897 (1890s)
Authors: United States. Bureau of Fisheries Brice, John J. (from old catalog) Moore, H. F. (Henry Frank), 1867-1948 Chamberlain, F. M. (Frederick M.)
Subjects: Fish culture Oyster culture Frogs
Publisher: Washington, Govt. print. off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ered within a reason-able length of time, say from 36 to 48 hours after they fall from theovaries into the abdomen, they are surrounded with a thin watery fluid,having a glassy appearance, which if allowed to come in contact withwater will change to a milky white, and the eggs absorbing this fluidbecome hard and glassy, after which fecundation is impossible.Many thousand eggs have been lost annually on this account, and manybrood fish lost or rendered worthless from the same cause. The fish incaptivity will not spawn of their own accord unless they have accessto gravel or earth in which to make nests. If attention is not given tothe spawning fish and their eggs taken when ripe, they soon becomevery dark in color, the abdomen swells, and sometimes the head willenlarge, causing the eyes to protrude. Under these conditions the fishwill die in a few days, but with free and easy access to the racewaythey will not often be thus affected. Report U. S. F. C. 1897. (To face page 91.) Plate 26.
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THE BROOK TROUT. DESCRIPTION OF THE FISH. The brook trout or speckled trout (Salvelinus fontinalis) is one of themost beautiful, active, and widely distributed of the American trouts.It prefers clear, cold, rapid streams, and belongs to that group of troutknown as charrs, characterized by the presence of round crimson spotson the sides of the body. Other members of this class are the saiblingor charr (Salvelinus alpinus) of Europe and Greenland; the Sunapeetrout (S. alpinus aureolus), found in parts of New Hampshire andMaine; the blueback trout (S. oquassa) of the Eangeley Lakes in Maine,and the Dolly Varden trout, red-spotted trout, or bull trout (8. malma)of the Pacific States and Alaska. The lake trout also belongs in thisgroup. The general form of the brook trouts body varies considerably, some-times being elongated and sometimes rather short, but the usual depthis about one-fourth or one-fifth of the length. The head is large andblunt, and is contained 4£ times in the body lengt

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