File:Aquatic life (1917-1918) (19559284208).jpg

Title: Aquatic life
Identifier: aquaticlife319171918baus (find matches)
Year: 1917-1918 (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:
Qne Optimum of Water EDGAR R. WAITE, F. L. S. Director, SoutK Australian Museum
Text Appearing After Image:
The "Libertj^ Bond FisK," Franklin Barrett's Famous Red, WKite and Blue Carp From the original ^ater color by tne owner If you place a quart of ale before two men, and each man drinks half, the re- sult, as far as the individual is concerned, is much the same as though each man were supplied with a separate pint. From this we might not unnaturally argue that, as concerns the well-being of the indi- vidual, an equal result would be obtained by keeping two fishes in a quart of water as by keeping one fish in a pint. Though theoretically the argument would appear to be sound, in practice it is proved to be otherwise. For their normal development all liv- ing beings require a certain minimum amount of space and, as we are now deal- ing with aquatic animals, we may say that all need their optimum of water. By keeping the tadpole of a frog in a limited quantity of water I have been able to so retard its development that it has remained as a larva for over a year, and similar result is within the experi- ence of others also. Though food may be plentifully sup- plied, a fish kept in less than a certain volume of water will never reach its nor- mal development, while successive gen- erations, reared under similar conditions, will be permanently dwarfed. "Minia- ture goldfish" are produced in this man- ner. If one gallon of water be the minimum volume required for a certain fish, it does not follow that two such fishes would require two gallons of water; such quan- tity might satisfactorily support three or four fishes; the reason is obscure, but the fact remains.

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