File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14784148893).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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in the box and the operation repeated until eighteentrays are filled with eggs. The nineteenth, or top tray, is usually leftempty, but if the weather is very warm it is filled with fine ice. Thecover is then fastened down, the box marked, and the eggs are readyfor shipment to the hatchery. THE HATCHING APPARATUS. After a period of about thirty days on the gravel, the eggs are takenup and placed in the Clark hatching-box, for here they may be heldwithout any appreciable loss through the escape of fish when hatching.This apparatus as used at Northville is arranged as follows: A tank 15feet long, with a partition running its entire length, is so placed thatits lower end rests upon the upper end of a similar one 13 feet long,which differs from the upper one only in that it contains two boxes less.Nine partitions, placed crosswise of the tank, form, with the lengthwisepartitions, a double row of eight compartments, each of which is 19£ Report U. S. F. C. 1897. (To face page 97.) Plate 29.
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MANUAL OF FISH-CULTURE, 97 inches long and 15£ inches wide, and is provided with a waste-waterchannel or sluiceway leading into the next compartment. In thesecompartments are placed the hatching-boxes proper. The Clark box is 18 inches long, 14 inches wide, and 9J inches deep,and is made from f-inch dressed whitewood lumber. On its under sidethe box is provided with feet, 1^ inches square and § inch thick, to allowa free circulation of water under it and to prevent it from resting uponany sediment or refuse that may be deposited on the bottom of thetank; and on the inside in each bottom corner is fastened a block, § inchthick by 1£ inches square, to support the trays. Five circular openings,£ inch in diameter, permit the -escape of water from the box. A slot iscut in one end of the box so that water from the compartment abovecan not flow into the one below without falling into and passing throughthis box. Upon the feet or risers inside the box rest 9 trays, made ofperforated zinc

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