File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14577675069).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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Text Appearing Before Image:
Ovary of a yellow perch with nearly-ripe eggs, the forkedextremity being the anterior part of the roe. The eggs of the yellow perch are among the most remarkable that havebeen artificially hatched. The spawn is in one piece, a much elongatedribbon-like structure, of a semitransparent light-grayish color. Oneend of the large egg mass, corresponding to the anterior part of the roe,is larger than the other, and is bluntly forked. The string is very long,
Text Appearing After Image:
Part of a recently-laid mass of yellow-perch eggs. but may be much compressed lengthwise by virtue of its arrangementin regular transverse folds like the sides of a bellows or accordeon.When deposited the eggs are in a loose globular form, and after beingfertilized and becoming water-hard their mass rapidly becomes manytimes larger than the fish which laid them. The length of the stringsis from 2 to more than 7 feet, depending on the size of the fish. One 184 REPORT OF COMMISSIONER OP FISH AND FISHERIES. fish in an aquarium at Washington deposited a string of eggs 88 incheslong, 4 inches wide at one end and 2 at the other, whose weight afterfertilization was 41 ounces avoirdupois, while the weight of the fishbefore the escape of the eggs was only 24 ounces. A cavity extends the whole length of the egg mass, its walls beingformed by the delicate membrane in Avhich the eggs are imbedded. Thecavity is almost closed, small apertures occurring irregularly, whichhave the appearance of being

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