File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14763975242).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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shad feed on other minute organisms,such as exceedingly small crustaceans. Foodhas never been observed in the alimentary canaluntil ten or twelve days after the young fish hadleft the egg. At about the middle of the secondApplication of a measur- week considerable may be seen, but the intestineingscaletoa jar of shad is then not often very densely packed. At theeSSs- age of three weeks an abundance of food is found. They have been known at this early age to eat their own kind,and later the young carp and salmon. When cold, raw winds drivethe crustaceans into deeper water, the young shad follow them, andin aquaria they take Crustacea freely. In salt-water aquaria they maybe fed upon chopped oysters and canned herring-roe. Experiments with young shad have been carried on for several yearsat Central Station in salt-water aquaria. On one occasion about 250were received in October, at which time they were about five monthsold. They were put in brackish water, specific gravity 1.005, which
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MANUAL OF EISH-CULTURE. 155 was added to from day to day for nearly a week, when it was broughtup to 1.018, or the same specific gravity as the water used in the marineaquaria. At the time these were placed in the brackish water otherswere put into fresh-water aquaria, but the latter died within threedays. Those in salt water began in two or three days to take food,consisting of chopped oysters, clams, and beef, the preference beingfor oysters. At first they would take food only when it was sinking,later they began taking it off plants where it had lodged, and finallyfrom the bottom. Nearly all remained healthy, plump, and active forsix months, some living until about midsummer. For ten years past two or three million shad fry have been rearedannually at the Fish Ponds, Washington, D. C. A 6-acre pond is used,the water supply being taken from the city water-works. The depthvaries from 2 to 3 feet, and throughout the whole extent there is a densegrowth of water-plants, among which crus

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