On the Culture of Salmonidae and the Acclimatization of Fish, by J.R.G. Maitland

On the Culture of Salmonidae and the Acclimatization of Fish, by J.R.G. Maitland

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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. 1884 edition. Excerpt: ...loses more of its original buoyancy--is such as to keep the whole apparatus at the bottom, whilst the pull of the warp by which the trawl is towed along, is in a direction slanting upwards. There are therefore two opposing forces, one tending to keep the net on the ground, and the other lifting it. The object is to regulate these forces so that the pull from the warp shall move the trawl lightly along the bottom, but without raising it from the ground. If then there be too little warp allowed and there be not slope enough, the pull will be too much upward, and the net will be lifted; but if, on the other hand, there be too much warp, the trawl-irons and net will be dragged too much on the ground, and the friction will be greatly increased. One of the conditions on which this regulation depends is the amount of wind; for if there be very little breeze to drive the vessel along, the friction of the net and irons on the bottom may be sufficient to stop her way entirely. In such a case, very little extra warp is required, so that the lifting power may be increased, and the friction over the ground lessened. But if there be a great deal of wind, which will drive the vessel along even with comparatively little sail, and especially if, as in such a case is likely to occur, there is a good deal of sea, and the strain on the warp becomes irregular and jerking, then more warp is allowed to counteract the tendency there is to lift the net off the ground. This, as has been said before, is a matter of experience; and the ready way in which these rough fishermen make their calculations, often, we may venture to say, without being able to explain their reasons, is shown by the successful manner in which they commonly fish in all kinds of weather. There...show more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236762568
  • 9781236762566