File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14761158501).jpg

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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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ally employed in marinefish-cultural operations. The general object of its construction is theproduction of an automatic rise and fall of water, as in the McDonaldbox, although it differs from the latter in some essential particulars.It consists of a box of variable dimensions in which jars are placed forthe reception of the eggs. A convenient size of box is 7£ feet long, 2feet wide, and 2£ feet deep. From 4 to 8 large glass jars are arrangedon wooden supports 7 or 8 inches above the bottom of the trough.Smaller boxes, to accommodate only 2 or 4 jars, are also used. The jarsare about 9 inches in diameter and are of two heights—9 inches and 17or 18 inches; they have straight sides and a flat bottom with a centralhalf-inch hole. The jar is placed in the box in an inverted position, with its bottomabove the level of the top of the trough. The sea water supplying thetrough enters the compartment at one end of the trough and escapes Report U. S. F. C. 1897. (To face page 204. Plate 57.
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CHESTER BOXES. MANUAL OF FISH-CULTURE. 205 by means of a siphon in the other compartment, running through a holeseveral inches below the top of the trough. The trough fills with waterup to a level with the hole, when the siphon begins to act and takes offthe water more rapidly than it enters, to a level with the inner end ofthe siphon, the fall being 4 to 5 inches. Air then enters the siphon,and it ceases to act until the water has again risen to the height of thedischarge hole. The water thus rises and falls in the jars automatically,the interval between the successive discharges being regulated by thelength of the inner arm of the siphon, the size of the tube, and amountof water supplied. After the eggs are introduced into the jars a piece of cheese-cloth orlinen scrim is placed over the top, and fastened by means of rubberbands. The jar is then inverted and placed on the wooden supportsprovided for the purpose, and the plug in the bottom removed to allowthe escape of the air and th

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