1921
Volume 5, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645
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Abstract

Summary

The egg-laying habits of and were observed experimentally at 3 temperatures over a 12-month period. It was noted that:

  • 1.  Most (84.5%–91%) of the eggs of were laid in soil, while those of were laid largely on objects such as brick, gravel and saucer wall.
  • 2.  A medium water level (1/3 saucer capacity) in the rearing saucers resulted in better snail reproduction than at the high (flooded) or low (moist) level.
  • 3.  At 26°C. egg laying started earliest and more eggs and young were found than at 20° or 32°C. Of these last two temperatures, the better results were obtained at 20°C.
  • 4.  Snail mortality was lowest at 20° and highest at 32°C. Adverse culturing conditions developed more rapidly in the saucers kept at 32°C. than at the other two temperatures.
  • 5.  The majority of the eggs were laid above the water line. For the percentage is 94, and for the percentage is 71.

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