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

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.

Loading

Article metrics loading...

/content/journals/10.4269/ajtmh.1956.5.544
1956-05-01
2017-11-25
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journals/10.4269/ajtmh.1956.5.544
Loading

Most Cited This Month

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error