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The Physiological Effects Upon Fishes of Changes in the Density and Salinity of Water

The Physiological Effects Upon Fishes of Changes in the Density and Salinity of Water


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906. Excerpt: ... CONTRIBUTIONS FROM THE BIOLOGICAL LABORATORY OF THE BUREAU OF FISHERIES AT WOODS HOLE. MASS. THE PHYSIOLOGICAL EFFECTS UPON FISHES OF CHANGES IN THE DENSITY AND SALINITY OF WATER. Bv FRANCIS B. Sl'MNKR, Ph. I)., Director Fisheries Laboratory, ll'oods Hole, Mass. INTRODUCTION. It is a commonplace to both fisherman and xoologist that certain fishes dwell exclusively in salt water and others exclusively in fresh water, while others yet may live indifferently in either medium. It is well known, also, that death is frequently the result of an abrupt and considerable change of density..Numerous problems of great physiological importance are here involved. Why is an extreme change of density so fatal in some cases and so harmless in others tf And is it the change of density which is responsible for the harmful effects, after ali? May not saltwater be toxic, in a narrower sense, to fresh-water fishes, and vice versa? In any case, what is the immediate cause of death ( Are the limiting membranes of a fish permeable to both water and salts, or are they only semipermeable? Or, are they, perhaps, impermeable to both' And are all of the limiting membranes alike in this regard' Likewise, is their condition the same for all species and under all circumstances? These are closely related questions. They have received many and quite contradictory answers. It is hoped that the experiments discussed in the ensuing pages have contributed something toward their solution. The first of these experiments were chiefly concerned in determining whether a given change in water density was harmful to a given species of fish, records being kept of the rate of death. In a second series weight determinations were made with a view to ascertaining whether such changes in the density o...


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Product Details
  • ISBN-13: 9781235672828
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235672824
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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