A Guide for the Dissection of the Dogfish (Squalus Acanthias)
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A Guide for the Dissection of the Dogfish (Squalus Acanthias)

A Guide for the Dissection of the Dogfish (Squalus Acanthias)


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ' A Guide for the Dissection of the Dogfish The small sharks which abound along the coasts of the United States are commonly called dogfish by fishermen and others. The dogfish of inland waters belongs to an entirely different group. Two species of sharks are caught in numbers and used in laboratory work, the spiny dogfish (Squalus acanthias) and the smooth dogfish (Eugaleus galeus). The first'is easily distinguished by the sharp spine in front of each dorsal fin. Squalus acanthias is often referred to under the synonym Acanthias vulgaris, while Eugaleus galeus is more frequently named either Mustelus canis or Galeus canis. The histories of these names and systematic descriptions of the species are contained in Samuel Carman's Monograph on the Elasmobranchs. Several sizes of dogfish are furnished by dealers. We consider it best to purchase large, fully developed specimens. The small specimens may be a little more convenient to handle, but the large ones have the important advantage of being sexually mature, while blood vessels and nerves are dissected better in large than in small specimens. Also, a number of structures are very different in mature animals from their condition in young ones. Dealers should be requested to furnish fish with fins and tails complete instead of trimmed. It is an advantage to issue to the class equal numbers of both sexes. An entire specimen and an extra head may be required by each student for a thorough dissection. It would be better if the head were cut off just behind the pectoral fins, instead of in front of them as is usually done, so that the vagus and hypobranchial nerves may be dissected more completely. The spiny dogfish, which is the particular subject of this guide, is the species most frequently supplied to laborat...


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Product Details
  • ISBN-13: 9781459017658
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 145901765X
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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