File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14764011472).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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on varying from about 40 days at theformer temperature to 11 or 12 days at the latter. Sudden and extremevariation between the temperature limits mentioned had little or noeffect except to retard or accelerate the hatching in accordance withthe rule just mentioned. When water of a temperature lower than33° F. was used many of the embryos were deformed. The degree ofsalinity of the water does not appear to exert much influence upon thehatching of the eggs. . THE SAND-DAB AND FOUR-SPOTTED FLOUNDER. Besides the flatfish or winter flounder, two other flounders have beenartificially hatched, on a small scale, at Woods Hole; these are thesand-dab (Bothus maculatus) and the four-spotted flounder (Paralichthysoblongus). The eggs of both fish are buoyant, and deposited in May.Those of the former are -$% inch in diameter, and of the latter ■£$ inch.The period of incubation at a temperature varying from 51° to 54° F.is about 8 days. ■Report U. S. F. C. 1897. (To face page 229.) Plate 61,
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HOMARUS AMERICANUS. American Lobster. THE AMERICAN LOBSTER. DESCRIPTION. The lobster (Homarus americanus) belongs to that group of the Crus-tacea called the Decapoda, because all of its members are provided withten feet, more or less adapted for walking. To the Decapoda also belongthe crabs and the shrimps, prawns, and crayfish. The crabs are lessrelated to the lobster than the other forms mentioned, and may bereadily distinguished from them by the relatively great breadth of thebody and the small size of the abdomen or tail, which is doubled underthe thorax to form the apron. The lobsters, crayfish, shrimps, etc.,are elongate forms with the tail or abdomen very large and extendedmore or less in the same horizontal plane with the anterior part of thebody. The lobster and the crayfishes are somewhat closely related, butdiffer, among other characters, in the number and structure of the gillsand in the relative size of the flat plate or scale which is attached atthe base of the antennae

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