File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14763963092).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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sm of their neighbors. The firstthree of these causes can be guarded against, but the last is much moredifficult to prevent. At the first sign of cannibalism the fish must bethinned out, and, if feeding well, transferred to the rearing-pond, wherethey will have greater range for development. In fact, for any of thediseases this will prove of more benefit than anything else. It is beneficial to treat the fry with salt twice a week by shuttingoff the water and sprinkling salt in the trough until a weak brine isformed. The fish must be watched closely, and as soon as they showany signs of turning up a full head of water must be turned onuntil all the brine is washed off, after which the supply may be reducedto the regular amount. A small quantity of swamp earth should bescattered in the tanks about once in two weeks, merely enough to dis-color the water for a few moments, and allowed to wash off graduallywith the current of the water. Report U. S. F. C. 1897. (To face page 119) Plate 33.
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THE WHITEFISH. DESCRIPTION, COMMON NAMES, ETC. The common whiteflsh (Coregonus clupeiformis) is eminently a lakefish. It exists throughout the Great Lakes region, and is especiallyabundant in lakes Brie, Huron, Michigan, and Superior. The easternlimit of its range is Lake Champlain, and it is found in Lake Winnipeg,and possibly farther west. It is landlocked in Otsego Lake, New York.Efforts to introduce it into new waters in the States of the Pacific Coastand Eocky Mountain region have not as yet been successful. Its body is rather long and compressed, and the back, especially inadults, is arched in front; the greatest depth is about one-fourth thebody length. The head is small and short, contained about 5 times inthe length of the body; the snout is blunt; the mouth is small andnearly horizontal with the lower jaw included; the maxillary is shortand broad, reaching to a point under the pupil; the mandible extendsto a point under the posterior edge of eye. The eye is small, its diam-t

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