Report of Investigations on the Life-History of the Salmon in Fresh Water; From the Research Laboratory of the Royal College of Physicians of Edinburgh

Report of Investigations on the Life-History of the Salmon in Fresh Water; From the Research Laboratory of the Royal College of Physicians of Edinburgh

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ... somewhat too limited series of observations indicates--1. That the male fish coming to the rivers throughout the season have a musculature somewhat poorer in solids than the female fish. 2. That in the upper reaches the percentage of solids is about the same as in the female fish. 3. That the nature of the change in the percentage of solids is the same as in the female fish. 4. That the testes are considerably poorer in solids than the ovaries. 5. That there is in the testes a more marked increase in the per centage of solids than in the ovaries in October and November. 6. That in the estuary fish, as regards the amount of solids in the muscle per fish of standard length, there is a marked increase in July and August, and a decrease in October and November. 7. That throughout the season the amount of solids in the muscle is smaller in the fish in the upper reaches than in those at the mouths of the rivers, and that the difference becomes more and more marked as the season advances. I TABLE V. Solids of Muscle. 8. That the amount of solids in the testes per fish of standard length steadily increases in fish in the estuaries and in fish in the upper waters throughout the season, and that the increase is even greater in the sea than in the upper reaches. But since only one upper-reach fish was examined in October and' November, too much stress cannot be placed upon this. A balance of the loss of muscle solids and the gain in the solids of the testes may be struck as follows: --A. Balance to August. Grms. Solids in muscle of estuary fish from May to August, -2130 Solids in muscle of upper-water fish in July and August; 1592 Loss, -538 Solids in testes of estuary fish from May to August, -3-7 Solids in testes of upper-water fish in July and...show more

Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236851528
  • 9781236851529