File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14784209503).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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fully resorbed, the purely aquatic life is forsaken for theamphibious and the food is changed from dead to living matter, whichmust demonstrate its living condition by motion. The peculiarly formedtongue—loose behind, so that it may be thrown out to quite a distance—is covered with a viscid secretion so that the frog readily capturesany insects or small animals that approach it closely. Tadpoles arecommonly satisfied to wait patiently for their food, and even the adultsdo not often search actively for food. Sexual maturity is reached inabout three or four years, being latest for those varieties that pass thefirst winter in the tadpole stage. It is generally believed that frogslive for 12, 15, or even 20 years. During the tadpole stage they furnish tempting morsels for fish, rep-tiles, some mammals, and other frogs, and especially for wading birds,like herons and cranes. Their defenseless condition and the shallow-ness of their natural habitats at this period make them ready prey,
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Spring Frog or Leopard Frog (Bana vireseens). and it is in the prevention of this wholesale destruction that mprofitably intervene. In the adult frog stage the relent uit by birds and reptiles is continued until of the hundreds of eggs depositedfew become reproducing individuals. Only slight revenge for all thisslaughter can be taken. They may occasion!ally capture disabled fishor small fish of sluggish habits found in he id or on the bottom, andinstances are recorded of their eating , toads, and young birds,but insects and lower forms are then i diet. DESCRIPTIONS OF MARKETABLE FROGS OF THE UNITED STATES. The species of frogs comitm; eaten are the bullfrog (Bana cates-biana), the green frog (Rana dampta), the spring frog (Bana vireseens),and the western bullfrogs (Bajna pretiosa and Bana aurora). The following references to their geographical distribution and briefdescriptions of their color a nd form have mainly been extracted fromProfessor Copes work on The Batrachia of North Ameri

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