Part Six: Reproduction


, Volume 147, Issue 1, pp 329-334

Fertilization and male fertility in the rotifer Brachionus plicatilis

  • Terry W. SnellAffiliated withDivision of Science, University of Tampa
  • , Frank H. HoffAffiliated withFlorida Aqua Farms

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The role of males in fertilization in the rotifer Brachionus plicatilis was examined. Neonate mictic females sometimes escaped fertilization even when sperm were present in their pseudocoeloms. Males made a major contribution to this fertilization failure through temporary infertility. As males aged, sperm numbers and motility decreased. Maternal diet was found to play a primary role in determining the fertilizing capacity of the F1 males. Females from log phase populations produced males with higher sperm counts and motility than females from stationary phase populations. A conditioning factor in the medium may increase sperm number and fertilization rate.


fertilization sperm number sperm motility ageing diet Rotifera