File:Aquatic life (1916-1917) (19720945486).jpg

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Title: Aquatic life
Identifier: aquaticlife219161917baus (find matches)
Year: 1916-1917 (1910s)
Authors: Bausman, Joseph E
Subjects: Aquariums; Fish culture
Publisher: Philadelphia : J. E. Bausman
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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Text Appearing Before Image:
:;?) Breeaing and Rearing Golafisn (y. â¢â¢â¢â¢â¢â¢ â¢â¢â¢â¢â¢ â¢â¢â¢â¢ JOSEPH E. VAN STAVERKf PhotograpK by H. W. ScKmid â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢â¢ The goldfish is oviparous; that is, the eggs are expelled by the female before fertilization, which takes place immedi- ately after delivery. Unlike some other fishes, all the eggs do not develop to- gether, but in lots so to speak. A female may spawn several times during a season, the frequency of the operation varying with her fertility and vigor. The pre- ferred breeding season, which means that the ensuing months will be most favor- able in weather conditions and natural food supply, extends from March to July. Earlier and later spawns will meet conditions unfavorable to rearing. The first indication of the approach of a spawning operation will be the action of the male in driving a gravid female. Then it will be noted that she is swollen with eggs, and that he exhibits the char- acteristic tubercles or tiny spots on his pectoral fins and gill-covers. Fancy gold- fish are not usually bred in pairs. If the fish are alike in size two males, or three if the males are smaller, are used with one female. This insures against.unfertile eggs should one of the males become exhausted before the female stops spawning. The selected trio should be placed in a small tub or a large enamel dishpan, with three or four loose bunches of Myriophyllum or an equal number of water hyacinths with long, bushy roots. Spawning may then be expected, and usually occurs during the early morning hours. The males drive the female per- sistently through the plants, and with a sinuous side-to-side movement they assist in the expulsion of the eggs and fertilize them. The eggs resemble tiny golden spheres, about the side of the head of an ordinary pin. The fish should be re- moved when they cease to drive. The eggs will hatch in a period vary- ing from three to eight days, according to the temperature of the water, which
Text Appearing After Image:
Calico Telescope Goldfish A female about to spawn Owned by George Wilt should be not less than 60 degrees. When the fry appear they seem to be all head and eyes, carrying a large ball on the under side. This protuberance, seem- ingly so disproportionate to the size of the tiny creature, is the yolk-sac from which the young fish absorbs its first nourishment. This disappears in a few days, and the youngster seeks the animal- cules or infusorians now necessary. At this stage of its career growth is rapid

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https://www.flickr.com/photos/internetarchivebookimages/19720945486/

Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1916
Flickr tags
InfoField
  • bookid:aquaticlife219161917baus
  • bookyear:1916-1917
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Bausman_Joseph_E
  • booksubject:Aquariums
  • booksubject:Fish_culture
  • bookpublisher:Philadelphia_J_E_Bausman
  • bookcontributor:Harvard_University_Museum_of_Comparative_Zoology_Ernst_Mayr_Library
  • booksponsor:Harvard_University_Museum_of_Comparative_Zoology_Ernst_Mayr_Library
  • bookleafnumber:137
  • bookcollection:biodiversity
  • bookcollection:Harvard_University
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
16 July 2015

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